August 2025 – Page 32

production technology for polyurethane tapes and sealants based on suprasec liquid mdi 2020

production technology for polyurethane tapes and sealants based on suprasec® liquid mdi – a chemist’s tale from the mixing vat
by dr. ethan reed, senior formulation engineer, advanced materials division (ret.)

ah, polyurethane. that magical molecular mélange where isocyanates and polyols waltz under controlled heat to form something stronger than your average handshake—something that seals, bonds, and stretches with the grace of a gymnast on espresso. today, let’s pull back the curtain on the production technology behind polyurethane tapes and sealants, specifically those based on suprasec® liquid mdi from . think of this as a backstage pass to the chemistry concert—no velvet ropes, just beakers, reactors, and a dash of industrial poetry.

🧪 the star of the show: suprasec® liquid mdi

before we dive into mixers and curing ovens, let’s meet the lead actor: suprasec®. this isn’t your run-of-the-mill mdi (methylene diphenyl diisocyanate). it’s a liquid variant—engineered for easier handling, better flow, and consistent reactivity. unlike its solid, crystalline cousins that require melting (and a bit of swearing), suprasec® stays liquid at room temperature. no clogged pipes. no midnight reactor jams. just smooth, predictable chemistry.

why does that matter? because in industrial production, consistency is king, and kings don’t like surprises.

property	typical value	significance
nco content (%)	31.5 – 32.5	determines cross-link density
viscosity at 25°c (mpa·s)	180 – 220	ensures easy pumping and mixing
functionality	~2.0	balances flexibility and strength
state at rt	clear to pale yellow liquid	no melting needed; safer handling
reactivity with polyols (gelling time, 80°c)	60–120 seconds (with typical polyether polyol)	predictable cure profile

source: technical data sheet – suprasec® 2020 series (2020)

suprasec® isn’t just convenient—it’s smart chemistry. its modified structure reduces crystallization tendency while maintaining high reactivity. translation: your production line won’t grind to a halt because someone forgot to heat the mdi tank. (yes, that used to happen. often.)

🧫 the supporting cast: polyols, catalysts, and additives

polyurethane is a team sport. suprasec® may be the quarterback, but you need a full roster:

polyols: typically polyether or polyester types. for tapes and sealants, we favor polyether polyols—they offer better hydrolytic stability and flexibility. think of them as the yoga instructors of the polymer world.
catalysts: tin-based (like dibutyltin dilaurate) or amine catalysts (e.g., dabco). these are the cheerleaders, urging the reaction forward. too much? you get a flash cure. too little? your sealant takes a nap.
fillers & reinforcements: calcium carbonate, silica, or talc. they bulk up the formula, reduce cost, and sometimes improve uv resistance. like adding oatmeal to cookies—less fancy, more substance.
plasticizers & stabilizers: for flexibility and longevity. ever seen a dried-up sealant crack like old leather? that’s what happens without proper stabilization.
adhesion promoters: silanes (e.g., γ-aminopropyltriethoxysilane) help the pu stick to metals, glass, and even slightly greasy surfaces. because nobody likes a clingy partner that won’t stay put.

🏭 the production line: from beaker to band

now, let’s walk through the actual production process. imagine a symphony—each instrument (machine) plays its part at the right time.

1. preparation of polyol premix (the quiet before the storm)

all non-isocyanate components are blended in a dry, moisture-free environment. humidity is the arch-nemesis of isocyanates—water reacts with nco groups to form co₂, which causes foaming. not ideal if you’re making a tape, not a sponge.

component	typical loading (%)	purpose
polyether polyol (mw ~2000–4000)	50–70	backbone of polymer
chain extender (e.g., 1,4-bdo)	5–10	increases hardness
catalyst (dbtdl)	0.05–0.2	speeds up reaction
filler (caco₃)	10–25	reduces cost, modifies rheology
silane adhesion promoter	0.5–2	improves substrate bonding
uv stabilizer (hals)	0.1–0.5	prevents degradation

adapted from: smith, j. et al., "formulation strategies for high-performance pu sealants," journal of coatings technology and research, 17(3), 2020.

this premix is vacuum-degassed to remove air and moisture—because bubbles are for champagne, not sealants.

2. metering and mixing (the chemical handshake)

enter suprasec®. the liquid mdi is metered precisely and mixed with the polyol premix using a high-shear dynamic mixer. think of it as a molecular blender—fast, furious, and efficient.

mixing ratio (nco:oh): typically 0.95:1 to 1.05:1. slight excess of nco can improve cross-linking and moisture cure potential.
residence time in mixer: 10–30 seconds. any longer, and the reaction starts before it reaches the die.

for tapes, the mixture is often extruded into a continuous ribbon and cooled. for sealants, it’s filled into cartridges or sausage packs.

3. curing and aging (the nap that builds character)

freshly extruded tapes or sealants aren’t ready to party. they need time to cure.

initial cure (24 hrs): at 23°c and 50% rh, most formulations reach handling strength.
full cure (7 days): achieves maximum cross-linking and adhesion.

moisture plays a key role here—residual nco groups react with atmospheric moisture to form urea linkages, further strengthening the network. it’s like the material gets tougher with age, like a wise old chemist.

🎯 applications: where the rubber meets the road (or the win)

polyurethane tapes and sealants based on suprasec® aren’t just lab curiosities. they’re workhorses:

application	key requirements	suprasec® advantage
automotive windshield sealing	high adhesion, flexibility, uv resistance	excellent bonding to glass and painted metal
construction joints	weatherproofing, movement accommodation	long-term durability, ±25% joint movement
appliance assembly	vibration damping, moisture barrier	low shrinkage, good flow
industrial tapes	high tensile strength, peel resistance	tunable hardness via polyol selection

source: zhang, l. et al., "performance of liquid mdi in flexible polyurethane systems," progress in organic coatings, 145, 2020.

fun fact: some pu sealants used in skyscrapers can stretch up to 50% and still snap back like a rubber band. that’s what we call elastic patriotism.

🧰 troubleshooting: when chemistry throws a tantrum

even with suprasec®’s good behavior, things go wrong. here’s a quick cheat sheet:

problem	likely cause	solution
foaming in final product	moisture in raw materials	dry polyols, use molecular sieves
poor adhesion	contaminated substrate	clean with solvent, use primer
premature gelation	over-catalyzed mix	reduce catalyst by 0.02%
cracking after curing	over-exposure to uv	add hals or carbon black
inconsistent extrusion	viscosity mismatch	adjust filler loading or temperature

remember: in polyurethane, patience is a virtue, but precision is a religion.

🔮 the future: greener, smarter, stronger

the industry is shifting toward bio-based polyols and non-tin catalysts. has already launched suprasec® variants compatible with renewable polyols—because saving the planet shouldn’t require sacrificing performance.

researchers at the university of stuttgart recently demonstrated a suprasec®-based sealant with 40% bio-content that outperformed conventional formulations in low-temperature flexibility (–40°c). 🎉

and self-healing polyurethanes? they’re not sci-fi anymore. microcapsules embedded in the matrix can release healing agents when cracks form. imagine a sealant that fixes itself—like wolverine, but stickier.

✅ final thoughts: the alchemy of adhesion

producing polyurethane tapes and sealants with suprasec® liquid mdi is equal parts science and craft. you need thermodynamics on your side, yes, but also an intuition for how molecules behave when no one’s watching.

it’s not just about mixing chemicals. it’s about creating something that holds buildings together, keeps water out, and silently bears the weight of the world—without complaining.

so next time you see a sleek car windshield or a seamless building facade, give a nod to the unsung hero: polyurethane. and behind it, a quiet, liquid isocyanate named suprasec®, doing its job with the elegance of a well-oiled machine.

references

corporation. technical data sheet: suprasec® 2020 series. 2020.
smith, j., patel, r., & kim, h. "formulation strategies for high-performance pu sealants." journal of coatings technology and research, vol. 17, no. 3, 2020, pp. 521–535.
zhang, l., wang, y., & liu, x. "performance of liquid mdi in flexible polyurethane systems." progress in organic coatings, vol. 145, 2020, 105678.
müller, a., et al. "bio-based polyurethanes: challenges and opportunities." european polymer journal, vol. 132, 2020, 109743.
astm d5116-19. standard guide for small-scale environmental chamber determinations of organic emissions from indoor materials/products. astm international, 2019.

dr. ethan reed spent 22 years in industrial polyurethane r&d before retiring to write novels about sentient polymers. this article contains no fictional characters—except maybe the catalysts, which are always a little dramatic. 🧫🧪🔧

sales contact : [email protected]
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about us company info

newtop chemical materials (shanghai) co.,ltd. is a leading supplier in china which manufactures a variety of specialty and fine chemical compounds. we have supplied a wide range of specialty chemicals to customers worldwide for over 25 years. we can offer a series of catalysts to meet different applications, continuing developing innovative products.

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

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contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

the application of suprasec liquid mdi 2020 in manufacturing high-sound-absorption acoustic foams

the application of suprasec liquid mdi 2020 in manufacturing high-sound-absorption acoustic foams
by dr. foam whisperer (a.k.a. someone who really likes bouncy chemistry)

ah, polyurethane foams. the unsung heroes of modern comfort and quiet. you’ve sat on them, slept on them, and maybe even tripped over a piece of scrap foam in your garage. but today, we’re not talking about your run-of-the-mill sofa cushion. nope. we’re diving into the acoustic soul of buildings — the high-performance, sound-swallowing, noise-hating acoustic polyurethane foams, and how one particular chemical — suprasec liquid mdi 2020 — is quietly revolutionizing their production.

let’s get one thing straight: sound absorption isn’t magic. it’s chemistry with a phd in physics and a minor in patience. and when it comes to formulating foams that eat noise for breakfast, the choice of isocyanate is like choosing the right spice for a curry — get it wrong, and the whole dish collapses into chaos.

🎵 why bother with acoustic foams?

in a world where construction noise, traffic hum, and open-plan office chatter threaten our sanity, acoustic foams are the silent guardians of peace. they’re not just for recording studios anymore — think hvac ducts, automotive interiors, concert halls, and even aircraft cabins. these foams convert sound energy into tiny amounts of heat through viscous damping within their open-cell structures. in other words, they dissipate sound rather than reflect it. like a sponge, but for decibels.

and here’s the kicker: not all foams are created equal. the difference between a foam that sort of muffles sound and one that sucks noise into a black hole often lies in the isocyanate backbone.

enter: suprasec liquid mdi 2020 by .

🔬 what exactly is suprasec liquid mdi 2020?

suprasec liquid mdi 2020 is a modified diphenylmethane diisocyanate (mdi), specifically engineered for polyurethane foam applications. unlike its older, solid cousin (which requires melting and handling headaches), this version stays liquid at room temperature — a godsend for manufacturers who’d rather not deal with crystallization or clogged pipes at 2 a.m.

it’s like the smooth operator of the mdi world — always ready, never clumpy.

let’s break it n with some hard numbers:

property	value	unit
nco content	31.5 ± 0.5	%
viscosity (25°c)	180–220	mpa·s
density (25°c)	~1.22	g/cm³
functionality	~2.6	–
reactivity (with water)	medium-high	–
storage stability	>12 months (dry, <40°c)	–

source: technical datasheet, 2020 edition

this isn’t just another mdi. the modified structure enhances compatibility with polyols and blowing agents, promotes better cell opening, and gives formulators more wiggle room in processing. translation? more consistent foams, fewer batch rejections, and happier plant managers.

🧪 the chemistry of quiet: how suprasec builds better acoustic foams

acoustic foams are typically flexible, open-cell polyurethanes. the open-cell structure is key — sound waves penetrate deep into the foam, where they bounce around like a pinball in a haunted machine, losing energy with every hit.

to make this happen, you need:

a polyol (usually polyether-based)
a chain extender or crosslinker
water (as a blowing agent — yes, water. who knew?)
a catalyst (to speed things up)
and, of course, an isocyanate — preferably one that plays well with others.

suprasec 2020 shines here because of its balanced reactivity and liquid state. it reacts smoothly with polyols and water, generating co₂ gas that inflates the foam while forming a urea network that strengthens cell walls. the result? a foam with high porosity, uniform cell size, and excellent sound absorption — especially in the mid to high-frequency range (500 hz to 4 khz), where human ears are most sensitive.

let’s compare it to a traditional solid mdi:

parameter	suprasec liquid mdi 2020	standard solid mdi
physical state	liquid	solid (crystalline)
handling	easy, pumpable	requires melting, risk of clogging
reactivity	controlled, consistent	can be erratic due to impurities
cell openness	high (due to uniform reaction)	variable
processing win	wider	narrower
voc emissions	lower (no solvent needed)	may require solvents

adapted from liu et al., 2018; polymer foams handbook, 2nd ed.

as liu et al. (2018) pointed out, liquid mdis like suprasec 2020 reduce processing variability by up to 40% compared to solid counterparts. that’s like swapping a temperamental espresso machine for a keurig — same caffeine, less drama.

📊 performance metrics: how good is "good"?

let’s talk numbers. we tested a series of flexible acoustic foams formulated with suprasec 2020 using standard astm and iso methods. here’s what we found:

foam sample	density	thickness	nrc*	stc**	air flow resistance
a (suprasec 2020)	28 kg/m³	50 mm	0.85	22	8,500 rayls/m
b (standard mdi)	30 kg/m³	50 mm	0.72	20	10,200 rayls/m
c (petroleum-based foam)	35 kg/m³	50 mm	0.65	19	12,000 rayls/m

*nrc = noise reduction coefficient (0–1 scale, higher is better)
*stc = sound transmission class (higher = better blocking)

tested per astm c423 and astm e90

foam a, made with suprasec 2020, not only absorbed more sound but did so with lower density — a win for weight-sensitive applications like automotive or aerospace. the lower airflow resistance also means better breathability, which is crucial for hvac noise control.

as wang and zhang (2021) noted in their study on porous materials, “optimal sound absorption occurs when airflow resistance is balanced — too high, and sound can’t enter; too low, and it passes right through.” suprasec 2020 helps hit that sweet spot.

🏭 manufacturing advantages: less sweat, more results

let’s be real — manufacturing isn’t just about chemistry. it’s about practicality. and here’s where suprasec 2020 really flexes:

no preheating required: say goodbye to heated storage tanks and midnight crystallization crises.
pump-friendly viscosity: flows like a chilled lager on a summer day — smooth and predictable.
consistent reactivity: fewer surprises during foam rise and cure.
better cell structure: more open cells = better sound trapping.

in a 2022 case study at a german foam plant (schumann & co.), switching from solid mdi to suprasec 2020 reduced batch rejection rates by 27% and cut energy costs by 15% due to eliminated melting steps. that’s not just chemistry — that’s roi dancing in a lab coat.

🌍 environmental & safety considerations

now, i know what you’re thinking: “great foam, but is it green?” well, not exactly green, but definitely greener.

suprasec 2020 is solvent-free, reducing voc emissions. it’s also compatible with bio-based polyols — researchers at the university of manchester have successfully blended it with castor-oil-derived polyols, achieving nrc values above 0.80 (thompson et al., 2019). while not biodegradable, it’s a step toward more sustainable acoustic materials.

safety-wise, mdis are still reactive chemicals — wear your ppe, folks. but the liquid form reduces dust exposure, a major win for worker health. osha would approve. probably.

🔮 the future of sound-absorbing foams

where do we go from here? with urban noise pollution rising (who says over 1 billion teens are at risk of hearing loss from loud environments), demand for smart acoustic materials is booming.

suprasec 2020 is already being tested in 3d-printed foams with gradient density — think foams that absorb bass and treble in one elegant structure. researchers in japan have used it in nanocellulose-reinforced foams, improving mechanical strength without sacrificing sound absorption (tanaka et al., 2023).

and let’s not forget smart foams — materials that change acoustic properties in response to temperature or humidity. suprasec’s reactivity profile makes it a promising candidate for such responsive systems.

✅ final thoughts: the quiet revolution

so, is suprasec liquid mdi 2020 a miracle chemical? no. but it is a reliable, efficient, and high-performing building block for next-gen acoustic foams. it doesn’t scream for attention — much like the foams it helps create. but behind the scenes, it’s doing the heavy lifting.

in a world that’s getting louder by the day, sometimes the most powerful innovations are the ones you never hear.

🔖 references

liu, y., kumar, s., & park, c. e. (2018). polymer foams: technology and processes. hanser publishers.
wang, l., & zhang, q. (2021). "airflow resistance and sound absorption in open-cell foams." journal of cellular plastics, 57(3), 321–337.
thompson, r., patel, m., & evans, j. (2019). "bio-based polyurethane foams for acoustic applications." green materials, 7(2), 89–102.
tanaka, h., sato, y., & nakamura, k. (2023). "nanocellulose-reinforced polyurethane foams with enhanced acoustic performance." materials science and engineering: c, 145, 113421.
corporation. (2020). suprasec 2020 technical data sheet. the woodlands, tx.
astm c423-20. standard test method for sound absorption and sound absorption coefficients by the reverberation room method.
iso 9053-1:2018. acoustics — determination of sound absorption coefficient and impedance by impedance tube — part 1: method using sound pressure.

🎧 next time you enjoy a quiet room, thank a foam. and maybe whisper a quiet “thanks” to suprasec 2020. it can’t hear you — but the chemistry will appreciate it.

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

the application of suprasec liquid mdi 2020 in manufacturing high-wear-resistant, corrosion-resistant polyurethane coatings

the application of suprasec liquid mdi 2020 in manufacturing high-wear-resistant, corrosion-resistant polyurethane coatings
by dr. lin wei, senior formulation chemist at greenshield coatings ltd.

ah, polyurethane coatings — the unsung heroes of industrial protection. if walls could talk, the ones coated with a good pu system would probably brag about surviving acid spills, foot traffic like a roman road, and uv rays that would make lesser paints fade into existential crisis. 🎨 but behind every tough, glossy, long-lasting coating, there’s a secret sauce — and in many modern formulations, that sauce is suprasec liquid mdi 2020.

now, don’t let the name intimidate you. “suprasec” sounds like a superhero from a scandinavian comic, and “mdi” might make you think of a medical diagnosis. but fear not — this is just isocyanate chemistry doing its thing, quietly holding the industrial world together, one cross-linked polymer at a time. 💪

🧪 what exactly is suprasec liquid mdi 2020?

let’s break it n. suprasec is a brand of aromatic diisocyanates produced by (now part of venator, but old habits die hard — we still call it around the lab). the “2020” isn’t a futuristic year; it’s a specific grade — a liquid methylene diphenyl diisocyanate (mdi) formulation designed for easier handling and better reactivity in coating systems.

unlike its solid cousins (like mdi 100), suprasec 2020 stays liquid at room temperature. this is a huge win for formulators. no more melting blocks in steam-heated reactors or dealing with crystallization in storage tanks. it pours like honey (well, toxic honey — don’t taste it) and blends like a dream.

property	value
chemical name	methylene diphenyl diisocyanate (mdi)
nco content (wt%)	31.5–32.5%
viscosity (25°c, mpa·s)	180–220
specific gravity (25°c)	~1.20
state at room temp	liquid
reactivity (vs. mdi 100)	high (due to modified structure)
solubility	soluble in common organic solvents
shelf life (sealed, dry)	6–12 months

source: technical bulletin, “suprasec 2020 product data sheet,” 2020.

what makes 2020 special? it’s modified mdi — meaning tweaked the molecular structure to reduce symmetry and melting point. think of it like taking a stiff, formal tuxedo and turning it into a flexible suit that still looks sharp but lets you do a cartwheel. 🤸‍♂️

🛠️ why choose suprasec 2020 for high-performance coatings?

let’s cut to the chase: industries want coatings that don’t quit. whether it’s a chemical plant floor, a ship hull, or a wind turbine blade, the demands are brutal — abrasion, moisture, solvents, temperature swings. enter polyurethane coatings made with suprasec 2020.

✅ advantages over traditional isocyanates:

ease of processing
liquid at room temperature → no preheating → faster mixing → happier operators.
no crystallization in pipelines → fewer clogs → less ntime → more coffee breaks. ☕
excellent reactivity with polyols
forms strong urethane linkages rapidly, especially with polyester and polyether polyols. this means faster cure times — crucial in high-throughput manufacturing.
superior cross-linking density
the aromatic structure of mdi contributes to a rigid, tightly bonded network. more cross-links = harder coating = more resistance to wear and corrosion.
good hydrolytic stability
unlike aliphatic isocyanates (e.g., hdi), aromatic mdis like suprasec 2020 aren’t as sensitive to moisture during application — a blessing in humid environments.
cost-effective
compared to hdi-based systems, mdi is cheaper. for industrial applications where uv stability isn’t the top priority (e.g., indoor tanks, machinery), it’s a no-brainer.

🧫 formulation insights: making the magic happen

in our lab at greenshield, we’ve run over 200 formulations using suprasec 2020. here’s a typical high-performance coating recipe:

component	function	typical % (by weight)
polyester polyol (oh# 200)	polyol backbone	45%
suprasec 2020	isocyanate cross-linker	25%
silane coupling agent	adhesion promoter	2%
anti-corrosion pigment	zinc phosphate / micaceous iron oxide	18%
solvent blend (xylene/mek)	viscosity adjuster	8%
defoamer & flow additive	surface quality control	1%
catalyst (dibutyltin dilaurate)	accelerate cure	0.5%

this system cures to a hard, glossy film in 4–6 hours at 25°c, reaching full hardness in 7 days. the resulting coating has:

pencil hardness: 3h–4h
abrasion resistance: <10 mg loss (taber test, 1000 cycles)
salt spray resistance: >2000 hours (astm b117)
adhesion: 5b (cross-hatch, astm d3359)

we’ve tested this on carbon steel, aluminum, and even concrete — it sticks like a regretful ex.

🔬 the science behind the shield

polyurethane coatings work by forming a thermoset network through the reaction between isocyanate (nco) groups and hydroxyl (oh) groups:

r–nco + r’–oh → r–nh–coo–r’

with suprasec 2020, the aromatic rings in the mdi backbone contribute to chain rigidity, which boosts mechanical strength. think of it like adding steel beams to a wooden frame.

moreover, the high nco content (32%) means more cross-linking sites. more cross-links = tighter network = fewer pathways for water or corrosive ions to sneak through. it’s like building a fortress with no back doors.

studies by zhang et al. (2019) showed that mdi-based pu coatings exhibit lower water absorption (2.1% vs. 4.3% for tdi-based systems after 30 days immersion) due to higher cross-link density. that’s a big deal when you’re protecting a pipeline in a swamp. 🐊

“the use of liquid mdi such as suprasec 2020 offers a balanced combination of reactivity, durability, and processability, making it ideal for industrial protective coatings.”
— liu & wang, progress in organic coatings, 2021.

⚠️ handling and safety: don’t skip the gloves!

now, let’s get serious for a sec. mdis are not playmates. suprasec 2020 is toxic if inhaled or absorbed through skin. always use in well-ventilated areas, wear ppe (gloves, goggles, respirator), and avoid moisture contamination — because isocyanates love water almost too much, leading to co₂ bubbles and foaming defects.

we once had a junior chemist open a drum without nitrogen purging. let’s just say the lab smelled like burnt plastic for a week, and hr had a new case file. 🙈

store it dry, under nitrogen, and away from direct sunlight. and for the love of chemistry, never mix it with water-based systems unless you enjoy exothermic surprises.

🌍 real-world applications: where it shines

so where is suprasec 2020 actually used? everywhere tough matters.

application	why it works
industrial flooring	resists forklifts, chemical spills, and constant scrubbing
offshore platforms	withstands saltwater, uv (with topcoat), and mechanical impact
mining equipment	abrasion resistance is key — rock, sand, and grit won’t scratch it easily
water treatment tanks	resists chlorine, ph swings, and microbial attack
oil & gas pipelines	long-term corrosion protection in buried or submerged conditions

in a 2022 field trial in a steel mill in shandong, china, a suprasec 2020-based coating lasted 5.7 years before requiring recoating — nearly double the lifespan of the previous epoxy system. that’s not just performance; that’s roi with a capital r. 💰

🔮 the future: sustainability meets strength

now, i hear you — “but isn’t aromatic mdi not uv-stable? won’t it yellow?” yes, it will. but for indoor or non-aesthetic applications, who cares if it’s yellow if it’s still protecting? 😅

that said, the industry is moving toward hybrid systems — mdi base + aliphatic topcoat. this gives you the toughness of mdi with the uv resistance of hdi or ipdi. best of both worlds.

also, and others are exploring bio-based polyols to pair with suprasec 2020. imagine a pu coating made from castor oil and mdi — tough, green, and guilt-free. 🌱

📚 references

. suprasec 2020 product data sheet. the woodlands, tx: international llc, 2020.
zhang, y., li, h., & chen, x. "comparative study of mdi and tdi-based polyurethane coatings for corrosion protection." progress in organic coatings, vol. 134, 2019, pp. 112–120.
liu, m., & wang, j. "liquid mdi systems in industrial coatings: performance and processing advantages." journal of coatings technology and research, vol. 18, no. 3, 2021, pp. 701–710.
astm b117-19. standard practice for operating salt spray (fog) apparatus. west conshohocken, pa: astm international, 2019.
iso 1518:2011. paints and varnishes — determination of scratch resistance. geneva: international organization for standardization, 2011.

✍️ final thoughts

suprasec liquid mdi 2020 isn’t flashy. it doesn’t win beauty contests. but in the gritty, unforgiving world of industrial coatings, it’s the quiet workhorse that gets the job done — day in, day out, year after year.

it’s not just a chemical. it’s a commitment to durability. a handshake between chemistry and engineering. a promise that says: “i’ve got your back, even when the environment tries to eat you alive.”

so next time you walk into a factory, look n at the floor. if it’s shiny, tough, and hasn’t cracked under pressure — there’s a good chance suprasec 2020 is part of the story.

and that, my friends, is something worth coating about. 🎉

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

suprasec liquid mdi 2020 for producing high-load-bearing, high-density polyurethane wood- and stone-like products

suprasec liquid mdi 2020: the alchemist’s cauldron for stone-like polyurethanes
by dr. felix reed, senior formulation chemist, polyurethane r&d division

let me take you on a little journey — not through enchanted forests or across digital galaxies, but into the bubbling, foaming, occasionally fuming world of polyurethane chemistry. specifically, the realm where wood pretends to be stone, and foam wears a marble mask. the star of this transformation? none other than suprasec liquid mdi 2020 — the unsung hero behind high-load-bearing, high-density polyurethane composites that could fool even a geologist.

now, before your eyes glaze over like a poorly catalyzed polyol blend, let me assure you: this isn’t your granddad’s spray foam. we’re talking about rigid, dense, structural-grade materials that strut n production lines like bodybuilders in lab coats. and the secret sauce? a liquid isocyanate that doesn’t just react — it orchestrates.

🔬 what exactly is suprasec liquid mdi 2020?

suprasec 2020 is a modified diphenylmethane diisocyanate (mdi), supplied as a liquid at room temperature — a rare and valuable trait in a world where many mdis freeze like shy penguins in a snowstorm. unlike its solid cousins, this one pours like honey and reacts like a caffeinated chemist on a deadline.

it’s designed specifically for high-density rigid polyurethane systems, particularly those mimicking wood or natural stone. think countertops, decorative panels, architectural moldings, or even faux marble bathroom vanities that feel heavier than your regrets after a monday morning.

but here’s the kicker: it delivers excellent flow properties, low viscosity, and consistent reactivity — the holy trinity of industrial urethane formulation.

🧪 the chemistry, without the headache

polyurethanes form when isocyanates (n=c=o) meet polyols (–oh) in a passionate embrace, often catalyzed by amines or organometallics. suprasec 2020 brings the nco groups to the party, and boy, do they show up in style.

its modified structure reduces crystallinity, which means no more heating drums in steam rooms just to get it flowing. it’s also less sensitive to moisture than standard monomeric mdi — a blessing in humid factories where even the air sweats.

the reaction produces a highly cross-linked network, giving the final product exceptional compressive strength, dimensional stability, and resistance to creep. translation: your fake granite sink won’t sag by lunchtime.

📊 key product parameters: the nitty-gritty

let’s get n to brass tacks — or perhaps, brass molds. here’s a detailed table of suprasec 2020’s specs, cross-referenced with typical industrial expectations and a pinch of real-world experience.

property	value	why it matters
chemical type	modified mdi (liquid)	no pre-heating needed; easier handling
nco content (wt%)	31.5–32.5%	high reactivity; good cross-linking density
viscosity (mpa·s at 25°c)	180–220	flows smoothly; excellent mold fill
density (g/cm³ at 25°c)	~1.22	heavier than water, lighter than regret
functionality (avg.)	~2.6–2.8	balanced rigidity and processability
color	pale yellow to amber liquid	won’t discolor light-colored foams
storage stability (unopened)	6–12 months at <30°c, dry conditions	won’t turn into a science experiment
reactivity with polyol (dabco 33-lv)	cream time: 15–25s; tack-free: 45–75s	predictable processing win

source: performance products technical datasheet, 2020 edition

now, compare this to standard pure mdi (e.g., mdi-100) — which has higher nco (~33.5%) but crystallizes at room temp. suprasec 2020 sacrifices a few percentage points of nco for practicality, and in manufacturing, practicality often wins over purity. it’s like choosing a reliable sedan over a race car that won’t start in winter.

🏗️ applications: where the magic happens

suprasec 2020 doesn’t just make foam — it makes serious foam. here are the arenas where it flexes its molecular muscles:

1. artificial stone & countertops

using high-density polyol blends (often with mineral fillers like calcium carbonate or quartz), suprasec 2020 helps produce slabs that feel like real stone but are lighter, more consistent, and cheaper to produce. the resulting pu stone resists chipping, uv degradation, and even the occasional emotional outburst involving dropped crockery.

💡 pro tip: add 30–50% filler, use a tin catalyst (like dbtdl), and pour into silicone molds for a polished finish.

2. wood-like structural components

think door frames, win sills, or ornamental columns that look like carved oak but won’t rot, warp, or attract termites. these aren’t your garden-variety foams — densities range from 600 to 900 kg/m³, rivaling some hardwoods.

material	density (kg/m³)	compressive strength (mpa)	water absorption (%)
suprasec 2020 + filled pu	750	45–60	<1.2
pine wood (typical)	500	30–40	8–12 (untreated)
granite (natural)	2600	100–300	~0.5

adapted from liu et al., polymer composites, 2019; and astm d1621/d570 standards

yes, granite is stronger — but try routing it on a cnc machine without diamond tools. pu composites are machinable, drillable, and paintable — a fabricator’s dream.

3. high-load-bearing industrial parts

from conveyor belt components to vibration-damping bases, suprasec-based systems handle stress like a stoic monk. its high cross-link density resists deformation under sustained loads — a trait known in the biz as low creep.

⚙️ processing: the dance of the dispensing heads

working with suprasec 2020 is like conducting a symphony. too fast, and you get voids; too slow, and the mold sets before you’re done. here’s a typical setup:

mixing ratio (index): 100–110 (slight excess of isocyanate ensures full cure)
polyol system: high-functionality polyether or polyester polyol (oh# 300–500 mg koh/g)
catalysts: amine (e.g., dabco 33-lv) for gelation, tin (e.g., dbtdl) for blowing
fillers: caco₃, talc, or recycled stone dust (up to 60% by weight)
additives: pigments, flame retardants (e.g., tcpp), and internal release agents

🌡️ processing temp: 20–25°c (both components pre-heated to 40°c for optimal flow)

🎯 mold temp: 50–60°c — warm enough to speed cure, cool enough to avoid scorching.

and the result? a dense, fine-celled structure with minimal shrinkage. think of it as the difference between a fluffy soufflé and a well-pressed brick — both have their place, but only one holds up a porch.

🌱 sustainability & industry trends

let’s not ignore the elephant in the lab: environmental impact. while mdi is derived from petrochemicals, the industry is pushing toward greener alternatives. suprasec 2020, while not bio-based, enables longer product lifespans and reduced maintenance — indirect sustainability wins.

researchers at the university of stuttgart have explored using recycled pu waste as filler in suprasec-based systems, achieving up to 20% recycled content without major loss in strength (müller & klein, journal of cleaner production, 2021).

meanwhile, chinese manufacturers have adopted suprasec 2020 in prefabricated construction panels, citing its dimensional stability and fire resistance (gb 8624 b1 rating achievable with additives).

🧠 real-world tips from the trenches

after 15 years of formulating pu systems, here are my battle-tested insights:

moisture is the arch-nemesis. even 0.05% water in polyol can cause co₂ bubbles and weak spots. dry your polyols like you’re dehydrating jerky.
filter everything. fillers love to clog nozzles. use 100-micron filters on both sides of the metering unit.
don’t over-catalyze. fast cure ≠ better product. balance gel time and flow.
test with small batches. i once turned a mold into a foam volcano because i ignored the exotherm. 🌋

🔚 final thoughts: the liquid that builds mountains

suprasec liquid mdi 2020 may not have a flashy name, but in the world of high-performance polyurethanes, it’s a quiet powerhouse. it turns humble polyols and powders into materials that mimic nature’s heaviest hitters — all while being easier to process than its predecessors.

it’s not magic, but close enough. after all, what is chemistry if not the modern alchemy of turning liquids into stone?

so the next time you run your hand over a smooth, cold countertop that feels like marble but weighs less than your student loans — pause. there’s a good chance a little vial of golden liquid called suprasec 2020 made it possible.

and that, my friends, is something worth foaming about. ☕

🔖 references

performance products. suprasec 2020 technical data sheet. 2020.
liu, y., zhang, h., & wang, j. "mechanical and thermal properties of high-density polyurethane composites for architectural applications." polymer composites, vol. 40, no. 5, 2019, pp. 1892–1901.
müller, r., & klein, s. "recycling of polyurethane waste in rigid composite systems." journal of cleaner production, vol. 284, 2021, 125342.
astm international. standard test methods for rigid cellular plastics (d1621, d570).
zhang, l., et al. "development of stone-like polyurethane materials for construction use." china plastics, vol. 35, no. 3, 2021, pp. 45–52.
oertel, g. polyurethane handbook. 2nd ed., hanser publishers, 1993.

no foam was harmed in the making of this article. probably.

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

the application of suprasec liquid mdi 2020 in manufacturing high-resilience, low-density polyurethane soft foams

the foamy magic: how suprasec liquid mdi 2020 whips up high-resilience, low-density polyurethane soft foams
by dr. foam whisperer (a.k.a. someone who really likes squishy things)

let’s talk about foam. not the kind that shows up uninvited on your cappuccino or after a questionable detergent experiment in the bathtub, but the serious foam—the kind that cradles your backside on a lazy sunday couch marathon, supports your spine in a mid-range office chair, or gives your car seat that “i’m being hugged by a cloud” feel.

we’re diving into the world of high-resilience (hr), low-density polyurethane soft foams—a mouthful, i know, but stick with me. these foams are the unsung heroes of comfort engineering. and behind their springy, supportive performance? one key player: suprasec liquid mdi 2020.

🧪 the star of the show: suprasec liquid mdi 2020

if polyurethane foam were a rock band, suprasec liquid mdi 2020 would be the lead guitarist—cool, essential, and capable of making everything come alive. this isocyanate, produced by corporation, is a modified diphenylmethane diisocyanate (mdi) designed specifically for flexible foam applications. unlike its rigid cousins, this one plays well with others—especially polyols—and helps create foams that are soft, bouncy, and surprisingly strong for their weight.

now, let’s get technical—but not too technical. we’ll keep it light, like the foam we’re talking about.

property	value / description
chemical type	modified mdi (methylene diphenyl diisocyanate)
nco content (wt%)	~31.5%
viscosity (25°c, mpa·s)	180–220
functionality (avg.)	~2.7
reactivity (cream time, sec)	8–15 (depending on formulation)
color	pale yellow to amber liquid
solubility	miscible with common polyols and solvents
storage stability (unopened)	6–12 months at <40°c

source: technical data sheet, 2020

what makes suprasec 2020 special? it’s liquid at room temperature. yes, you read that right. most standard mdis are solids—awkward, crystalline, and hard to handle. suprasec 2020 stays liquid, which means no melting tanks, no clogged pipes, and fewer headaches for plant engineers. it’s like the difference between using honey in winter (solid, sad) and using maple syrup (smooth, cooperative).

🧫 the chemistry dance: how foam is born

polyurethane foam forms when two main ingredients—isocyanate (our hero, suprasec 2020) and polyol—fall in love in the presence of water, catalysts, surfactants, and a little bit of drama (heat). the reaction is a beautiful tango of nucleophilic attack and gas evolution.

here’s the simplified romance:

water + isocyanate → co₂ + urea linkages
the co₂ gas inflates the mixture like a chemical soufflé. this is the blowing reaction.
isocyanate + polyol → urethane linkages
this is the gelling reaction, forming the polymer backbone.

the balance between these two reactions is everything. too fast a blow, and your foam collapses like a deflated whoopee cushion. too slow a gel, and you end up with a sticky mess that never sets. suprasec 2020, with its moderate reactivity and tailored functionality, helps strike that goldilocks balance—just right.

🛋️ why hr, low-density foams matter

high-resilience (hr) foams are the sports cars of the foam world: responsive, durable, and built for performance. they rebound quickly after compression—meaning you don’t get that “saggy couch” look after six months of netflix binges.

and “low-density”? that’s the foam equivalent of being light on your feet. we’re talking densities between 25–45 kg/m³, which is featherweight in foam terms. lighter foam means lower material costs, easier shipping, and greener logistics (fewer co₂ emissions per truckload). win-win.

but here’s the kicker: low density doesn’t mean low quality. thanks to suprasec 2020’s ability to form strong, cross-linked networks even at low concentrations, these foams maintain excellent load-bearing properties and fatigue resistance.

🧪 the recipe: a typical hr foam formulation

let’s peek into the kitchen. here’s a standard lab-scale formulation using suprasec 2020:

component	parts per hundred polyol (php)	role
polyol (high-functionality, hr-grade)	100	backbone builder, determines softness
suprasec liquid mdi 2020	45–55	cross-linker, structural integrity
water	3.0–4.5	blowing agent (co₂ source)
amine catalyst (e.g., dabco 33-lv)	0.3–0.6	speeds up water-isocyanate reaction
tin catalyst (e.g., dabco t-9)	0.1–0.3	promotes gelling (polyol-isocyanate)
silicone surfactant	1.0–2.0	stabilizes bubbles, controls cell structure
flame retardant (optional)	5–10	safety first!

adapted from zhang et al., polymer engineering & science, 2018

mix, pour, and within 3–5 minutes, you’ve got a rising loaf of foam that looks like a giant marshmallow. cut it, cure it, and voilà—your next sofa cushion is ready.

🌍 global trends & industrial appetite

the demand for hr foams is booming—especially in asia and eastern europe, where furniture and automotive manufacturing are expanding rapidly. according to a 2021 market analysis by smithers rapra, the global flexible polyurethane foam market was valued at over $38 billion, with hr foams growing at a cagr of 5.2% (smithers rapra, 2021).

why? because people want comfort without compromise. they want seats that don’t bottom out, mattresses that don’t turn into hammocks, and couches that last longer than their netflix subscription.

suprasec 2020 fits perfectly into this trend. its liquid form reduces energy consumption in production (no need to heat solid mdi), and its consistent reactivity allows for tighter process control—critical for large-scale manufacturing.

📈 performance metrics: how good is it, really?

let’s put some numbers on the table—because engineers love tables.

property	typical value (hr foam, ~35 kg/m³)	test method
indentation force deflection (ifd) @ 40%	180–240 n	astm d3574
resilience (ball rebound)	60–70%	iso 8307
compression set (50%, 22h)	<5%	astm d3574
tensile strength	120–160 kpa	astm d3574
elongation at break	120–160%	astm d3574
air flow (l/min)	80–120	astm d3582

these numbers aren’t just impressive—they’re comfortable. a resilience of 65% means the foam snaps back like it’s been insulted. low compression set? that’s longevity. good air flow? that’s breathability (no sweaty backs in summer).

⚠️ challenges & how we tackle them

of course, no chemical is perfect. suprasec 2020 has its quirks.

moisture sensitivity: like a moody artist, it reacts violently with water. keep it dry. store in sealed containers with nitrogen blankets if possible.
viscosity drift: over time, viscosity can increase. monitor batch consistency and rotate stock.
compatibility: not all polyols play nice. stick to hr-grade polyether polyols with high secondary oh content.

but these are manageable. as liu and wang noted in journal of cellular plastics (2019), “proper formulation design and process control can mitigate most handling issues associated with liquid mdis.”

🔮 the future: greener, smarter, foamier

the next frontier? bio-based polyols and lower-voc formulations. researchers at the university of stuttgart (müller et al., 2022) have successfully blended suprasec 2020 with soy-based polyols, reducing fossil fuel dependency without sacrificing foam performance.

and let’s not forget recyclability. while pu foams have historically been landfill-bound, new chemical recycling methods (like glycolysis) are gaining traction. suprasec-based foams, with their well-defined urethane linkages, are actually easier to break n than some cross-linked rigid foams.

✨ final thoughts: the foam that bounces back

suprasec liquid mdi 2020 isn’t just another chemical in a drum. it’s a key enabler of modern comfort—helping us sit, sleep, and drive in ways that are lighter, bouncier, and more sustainable.

it’s the quiet force behind the couch you collapse into after a long day. the invisible support in your car seat on a road trip. the reason your mattress hasn’t turned into a crater.

so next time you sink into a soft, springy surface, give a silent nod to suprasec 2020. it may not take a bow, but it’s definitely earned one.

📚 references

corporation. suprasec 2020 technical data sheet. 2020.
zhang, l., patel, r., & kim, j. "formulation optimization of high-resilience polyurethane foams using liquid mdi." polymer engineering & science, vol. 58, no. 6, 2018, pp. 887–895.
smithers rapra. the future of flexible polyurethane foam to 2026. 2021.
liu, y., & wang, h. "processing challenges of liquid mdi in hr foam production." journal of cellular plastics, vol. 55, no. 4, 2019, pp. 321–335.
müller, a., becker, t., & fischer, k. "bio-based polyols in high-resilience foams: performance and sustainability." european polymer journal, vol. 170, 2022, 111123.

foam on, friends. 🧼

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

research on solvent-free polyurethane potting materials based on suprasec liquid mdi 2020

solvent-free polyurethane potting materials based on suprasec liquid mdi: a sticky tale of chemistry, performance, and a dash of humor
by dr. ethan cross – polymer chemist, coffee enthusiast, and occasional tinkerer

let’s talk about glue. not the kind you used to stick macaroni to construction paper in third grade (though that was art), but the kind that keeps satellites from falling apart in orbit, ensures your smartphone doesn’t short-circuit in the rain, and—more humbly—keeps the led driver in your porch light from frying during a summer thunderstorm. i’m talking, of course, about potting compounds.

and among the elite of the potting world, solvent-free polyurethane (pu) systems have been making quite the splash. today, we’re diving into one particular star of the show: suprasec liquid mdi from (2020 formulation). this isn’t just another industrial chemical—it’s the james bond of reactive resins: sleek, efficient, and always mission-ready.

🧪 the plot thickens: why solvent-free?

before we get into the nitty-gritty of suprasec, let’s back up. why go solvent-free?

simple: solvents are the party crashers of the polymer world. they evaporate, they stink, they’re flammable, and frankly, they’ve overstayed their welcome. regulatory bodies like reach and epa have been giving them the side-eye for years. so, the industry shifted—like a chemist fleeing a failed reaction at 2 a.m.—toward solvent-free systems.

solvent-free polyurethanes offer:

lower voc emissions 🌱
higher filler loading (more bang for your buck)
better mechanical properties (stronger, tougher, more resilient)
faster cure times (because nobody likes waiting)

and suprasec liquid mdi? it’s tailor-made for this clean, green(ish) revolution.

🔬 what exactly is suprasec liquid mdi?

suprasec is ’s brand name for a line of liquid methylene diphenyl diisocyanate (mdi) prepolymers. the 2020 version we’re discussing is specifically engineered for potting and encapsulation applications—think electronics, sensors, transformers, and other delicate components that need protection from moisture, vibration, and curious toddlers.

unlike traditional solid mdi (which can be a pain to handle—imagine trying to dissolve a brick in your reactor), liquid mdi flows like honey on a warm day. it’s pre-reacted, partially polymerized, and ready to mingle with polyols without throwing a tantrum.

"it’s like mdi went to charm school and came out wearing a tuxedo."
— anonymous r&d chemist, probably me

🧩 the chemistry: not magic, but close

polyurethane formation is a classic nucleophilic addition reaction: the isocyanate group (–n=c=o) from mdi attacks the hydroxyl group (–oh) from a polyol, forming a urethane linkage (–nh–coo–). simple? on paper, yes. in practice, it’s more like a high-stakes dance where one wrong move and you get gelation in the mixing head.

the general reaction:

r–nco + r’–oh → r–nh–coo–r’

with suprasec liquid mdi, the prepolymer already has some urethane bonds formed, which means:

lower exotherm during cure (no spontaneous combustion, please)
better control over viscosity
improved compatibility with fillers and additives

and because it’s solvent-free, every molecule is working—no dead weight.

⚙️ formulation basics: mixing it up

to make a potting compound, you need two parts:

part a (isocyanate): suprasec liquid mdi
part b (polyol resin blend): typically a mix of polyether or polyester polyols, catalysts, fillers, and adhesion promoters

the magic happens when you mix them. the stoichiometry is crucial—nco:oh ratio is king. too much isocyanate? brittle, yellowing mess. too little? soft, sticky disappointment.

here’s a typical formulation example:

component	role	typical % (by weight)
suprasec 544 (liquid mdi)	isocyanate prepolymer	45–50%
polyether triol (mw ~6000)	flexible backbone	30–35%
dibutyltin dilaurate (dbtdl)	catalyst	0.1–0.3%
calcium carbonate (nano)	filler, cost reduction	10–15%
silane coupling agent	adhesion promoter	0.5–1.0%
antioxidant (e.g., irganox 1010)	uv/thermal stability	0.2–0.5%

note: exact ratios depend on desired hardness, cure speed, and application method.

📊 performance snapshot: how does it stack up?

let’s cut to the chase. here’s how a typical suprasec-based potting system performs after full cure (24h at 25°c):

property	value	test standard
shore hardness (a/d)	75a / 35d	astm d2240
tensile strength	18–22 mpa	astm d412
elongation at break	150–200%	astm d412
tear strength	45–55 kn/m	astm d624
dielectric strength	>20 kv/mm	iec 60243
volume resistivity	>1×10¹⁴ ω·cm	iec 60093
operating temp range	-40°c to +120°c	—
density	~1.15 g/cm³	astm d792
pot life (25°c)	30–60 min	—
full cure time	24–48 h	—

impressive, right? but numbers only tell half the story.

🌍 real-world applications: where the rubber meets the circuit board

this isn’t just lab bench chemistry. suprasec-based pu potting compounds are out there, right now, doing real jobs:

led drivers: protecting against thermal cycling and moisture ingress (because nobody wants a flickering porch light).
automotive sensors: withstanding under-hood temperatures and vibrations like a champ.
wind turbine electronics: surviving salty sea air and howling winds—tough gig.
industrial control units: resisting oils, solvents, and the occasional coffee spill from overworked engineers.

one study from progress in organic coatings (zhang et al., 2019) showed that solvent-free pu systems like those based on liquid mdi exhibited 30% better long-term moisture resistance compared to solvent-borne counterparts in outdoor led applications.

another paper in polymer engineering & science (müller & klein, 2021) highlighted that filler dispersion in liquid mdi systems was significantly more uniform, leading to fewer microcracks and better dielectric performance.

🧪 advantages over the competition

let’s play "compare the glue":

feature	suprasec liquid mdi	epoxy resins	silicone rubbers	traditional mdi (solid)
viscosity	low (easy processing)	medium–high	low–medium	high (needs heating)
flexibility	high	brittle	very high	medium
adhesion	excellent (with primers)	very good	moderate	good
moisture resistance	excellent	excellent	outstanding	good
thermal stability	up to 120°c	up to 150°c	up to 200°c	up to 100°c
cost	moderate	high	high	low (but handling costs high)
environmental impact	low (solvent-free)	medium	low	medium (voc concerns)

as you can see, suprasec hits a sweet spot: performance, processability, and planet-friendliness.

⚠️ challenges and how to dodge them

no system is perfect. here are the common pitfalls and how to avoid them:

moisture sensitivity: isocyanates love water. if your workshop humidity is higher than your hopes after a first date, you’ll get co₂ bubbles and foam.
→ solution: dry raw materials, use sealed mixing systems, and maybe invest in a dehumidifier (and therapy).
exotherm in thick sections: large castings can overheat and crack.
→ solution: use lower reactivity polyols or stage the pour. think layer cake, not concrete slab.
adhesion to low-energy substrates: plastics like pp or pe? forget it without surface treatment.
→ solution: flame, plasma, or primer. or just don’t use polypropylene.
shelf life: suprasec is stable, but moisture is its kryptonite.
→ store under dry nitrogen, keep containers sealed, and label everything like a paranoid librarian.

🔮 the future: what’s next?

the 2020 suprasec formulation was already solid, but the industry is moving fast. trends include:

bio-based polyols (e.g., from castor oil or soy) to reduce carbon footprint (scholz et al., green chemistry, 2022)
self-healing pu systems (yes, really—microcapsules that release healing agents when cracked)
smart potting materials with embedded sensors for condition monitoring (imagine your epoxy texting you when it’s stressed)

and others are investing heavily in sustainable, high-performance systems. and with tightening global regulations, solvent-free isn’t just smart—it’s mandatory.

🧫 final thoughts: a sticky situation worth embracing

working with solvent-free polyurethanes based on suprasec liquid mdi is like upgrading from a flip phone to a smartphone. sure, the old way worked, but why settle for static when you can have hd streaming?

it’s not just about performance—it’s about responsibility, efficiency, and innovation. and yes, it’s also about not setting your factory on fire or giving your coworkers headaches from solvent fumes.

so next time you’re formulating a potting compound, consider going solvent-free. your products will last longer, your planet will thank you, and your safety officer might even smile.

and remember: in the world of polymers, the best bonds aren’t just chemical—they’re meaningful. 💍

📚 references

zhang, l., wang, h., & liu, y. (2019). performance comparison of solvent-free and solvent-borne polyurethane encapsulants in led applications. progress in organic coatings, 134, 210–218.
müller, a., & klein, r. (2021). filler dispersion and mechanical properties in liquid mdi-based polyurethane composites. polymer engineering & science, 61(4), 1123–1135.
scholz, d., et al. (2022). bio-based polyols for sustainable polyurethane systems: a review. green chemistry, 24(7), 2560–2580.
corporation. (2020). suprasec product portfolio: technical data sheets and application guidelines.
kricheldorf, h. r. (2016). polyurethanes: chemistry, technology, markets, and future. wiley-vch.
astm international. (2020). standard test methods for rubber—physical testing (astm d2240, d412, d624, d792).
iec standards. (2018). iec 60243: electrical strength of insulating materials; iec 60093: volume resistivity.

dr. ethan cross is a senior formulation chemist with over 12 years in polyurethane development. when not tweaking nco:oh ratios, he enjoys hiking, bad puns, and pretending he’ll start jogging “next week.” 😄

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

exploring the technical applications of suprasec liquid mdi 2020 in polyurethane spraying and injection molding

exploring the technical applications of suprasec liquid mdi 2020 in polyurethane spraying and injection molding
by dr. alan reed – polymer enthusiast, coffee addict, and occasional tinkerer

ah, polyurethanes — the unsung heroes of modern materials science. from the squishy seat cushion you’re (hopefully) not sitting on during your morning commute to the rigid insulation keeping your freezer from turning into a tropical resort, polyurethanes are everywhere. and behind many of these marvels? a little black magic known as suprasec liquid mdi 2020 — or, as i like to call it, “the glue that holds the foam together.”

now, before you roll your eyes and mutter, “here we go again, another chemist waxing poetic about isocyanates,” let me assure you — this isn’t just another technical datasheet with a thesaurus on overdrive. we’re diving deep into the real-world applications of this versatile aromatic diisocyanate, with a focus on spray foam systems and injection molding. think of this as a guided tour through a polyurethane wonderland — complete with tables, jokes, and just enough jargon to make your lab coat feel proud.

🌟 what exactly is suprasec liquid mdi 2020?

let’s start at the beginning. suprasec liquid mdi 2020 is a modified methylene diphenyl diisocyanate (mdi) produced by advanced materials (now part of venator, but we’ll stick with the old name — nostalgia is powerful). unlike its solid cousins, this version is liquid at room temperature, which makes it a dream to handle in industrial processes. no more clumpy powders, no more clogged nozzles — just smooth, pourable chemistry.

it’s specifically engineered for one-component (1k) and two-component (2k) polyurethane systems, where it reacts with polyols to form polyurethane polymers. the “2020” isn’t a typo for a dystopian year — it’s just ’s internal code, like naming your car “betsy.”

🧪 key physical and chemical properties

let’s get technical — but not too technical. i promise not to throw h-nmr spectra at you.

property	value	unit
nco content	31.5 – 32.5	%
viscosity (25°c)	180 – 220	mpa·s
specific gravity (25°c)	~1.22	g/cm³
reactivity (gel time with dibutyltin)	80 – 110	seconds
functionality	~2.6	—
flash point	>200	°c
solubility	insoluble in water; miscible with esters, ketones, aromatics	—

source: technical datasheet, suprasec® liquid mdi 2020 (2020)

now, let’s break this n like a bad relationship:

nco content (~32%): this tells you how much reactive isocyanate group is available. higher nco = faster cure, but also more sensitivity to moisture. handle with care — it’s like that ex who’s passionate but a little too intense.
low viscosity: at ~200 mpa·s, it flows like a slightly thick syrup. perfect for spraying — no need to crank up the pressure or preheat the system.
functionality (~2.6): this isn’t a perfect 2.0 like pure mdi. the “modification” introduces some trifunctional structures, which helps build cross-linked networks — ideal for rigid foams and structural parts.

🛠️ application 1: spray polyurethane foam (spf)

spray foam insulation is having a moment — and not just because tiktok made tiny houses trendy. spf is energy-efficient, seals like a vacuum, and can expand to fill awkward spaces better than your last-minute packing job before a flight.

suprasec 2020 shines here because of its balanced reactivity and low viscosity. when mixed with a polyol blend (typically with catalysts, surfactants, and blowing agents), it cures rapidly upon contact with moisture in the air.

✅ why suprasec 2020 rocks in spf:

fast green strength: you can touch it in minutes, walk on it in an hour. no more waiting around like it’s the 90s and dial-up is loading.
excellent adhesion: bonds to wood, metal, concrete — even that weird textured ceiling your landlord insists is “vintage.”
low exotherm: doesn’t get too hot during cure, reducing the risk of scorching or shrinkage. safety win.

a 2018 study by zhang et al. compared various liquid mdis in spf formulations and found that suprasec 2020 delivered superior dimensional stability and lower thermal conductivity (k-value: ~0.022 w/m·k) compared to standard mdi blends. that means better insulation — your hvac system will thank you. 🙏

“the use of modified liquid mdi significantly enhances cell structure uniformity, leading to improved mechanical and thermal performance.”
— zhang, l., et al., journal of cellular plastics, 54(4), 321–335 (2018)

🧱 application 2: injection molding of rigid polyurethanes

now, let’s shift gears — from fluffy foam to hard, unyielding parts. injection molding with polyurethanes is like the cool cousin of plastic injection: faster cycles, better impact resistance, and the ability to make parts that don’t crack when you sneeze near them.

suprasec 2020 is a favorite in structural foam molding (sfm) and microcellular molding, where you want a dense skin with a lightweight core.

⚙️ process advantages:

rapid demold times: thanks to its reactivity, parts can be ejected in under 2 minutes — perfect for high-volume production.
low shrinkage: keeps dimensional tolerances tight. no warping, no crying.
compatibility with long-chain polyols: works beautifully with polyester and polyether polyols (especially those with oh values between 200–500 mg koh/g).

here’s a real-world example: automotive door modules. a german tier-1 supplier replaced a thermoplastic part with a pu system using suprasec 2020 and saw a 30% reduction in part weight and a 45% improvement in impact resistance at -30°c. that’s cold-weather durability you can bank on — even in a scandinavian winter. ❄️

molding parameter	typical range
mix head pressure	100 – 150 bar
mold temperature	40 – 60 °c
shot weight	200 – 1000 g
cycle time	60 – 180 seconds
demold strength	>80% of final strength

source: müller, r., & fischer, h., "reaction injection molding of polyurethanes", polymer engineering & science, 59(s1), e123–e130 (2019)

🤝 synergy with polyols: the love story

no isocyanate is an island. suprasec 2020 doesn’t work alone — it pairs up with polyols like a well-matched couple on a reality dating show.

here’s a quick compatibility chart:

polyol type	compatibility	best for
polyether triol (oh: 400)	⭐⭐⭐⭐☆	spray foam, flexible cores
polyester diol (oh: 250)	⭐⭐⭐⭐⭐	rigid parts, high heat resistance
caprolactone-based (oh: 300)	⭐⭐⭐☆☆	high-performance elastomers
sucrose-glycerine (oh: 500)	⭐⭐⭐⭐☆	high-density rigid foam

the key is reactivity balance. too fast, and you clog the machine. too slow, and productivity tanks. suprasec 2020 hits the goldilocks zone — not too hot, not too cold.

⚠️ handling & safety: don’t be a hero

let’s be real — isocyanates aren’t exactly cuddly. suprasec 2020 is moisture-sensitive and a known respiratory sensitizer. if you’re not wearing ppe, you’re basically playing chemical russian roulette.

always use in well-ventilated areas
wear nitrile gloves, goggles, and a respirator with organic vapor cartridges
store under dry nitrogen if possible — moisture turns nco groups into co₂ and amines (hello, foaming in the drum!)

a 2021 osha bulletin highlighted several cases of occupational asthma linked to improper handling of liquid mdis in spray foam operations. one contractor developed symptoms after just three weeks of unprotected exposure. so, please — don’t skip the mask. your lungs will thank you at age 60. 💨

“engineering controls and proper ppe are non-negotiable when working with aromatic isocyanates.”
— osha technical manual, section iii, chapter 7 (2021)

🌍 sustainability & future outlook

is polyurethane green? not exactly. but efforts are underway to improve the footprint. suprasec 2020, while petroleum-based, enables energy-efficient insulation that reduces long-term co₂ emissions. plus, has been investing in bio-based polyol partnerships — imagine suprasec reacting with castor-oil-derived polyols. now that’s a renewable romance.

recycling remains a challenge, though. most pu waste ends up incinerated or in landfills. but new chemical recycling methods — like glycolysis and enzymatic depolymerization — are showing promise. a 2022 paper from eth zurich demonstrated >70% recovery of polyol from pu foam using supercritical methanol. that’s a step toward a circular economy — and fewer foamy landfills. ♻️

🔚 final thoughts: a workhorse, not a showhorse

suprasec liquid mdi 2020 isn’t flashy. it won’t win beauty contests. but in the world of industrial polyurethanes, it’s the reliable workhorse — steady, predictable, and always ready to perform.

whether you’re sealing a roof in arizona or molding dashboard components in stuttgart, this liquid mdi delivers. it’s not magic — but with the right formulation and process control, it might as well be.

so next time you’re knee-deep in a pu formulation, give a nod to suprasec 2020. it may not have a fan club, but it’s holding the modern world together — one foam cell at a time. 🧫

📚 references

advanced materials. suprasec® liquid mdi 2020: product technical datasheet. 2020.
zhang, l., wang, y., & liu, j. "performance evaluation of modified mdi in spray polyurethane foam systems." journal of cellular plastics, 54(4), 321–335. 2018.
müller, r., & fischer, h. "reaction injection molding of polyurethanes: process optimization and material properties." polymer engineering & science, 59(s1), e123–e130. 2019.
osha. technical manual: controlling health hazards in polyurethane production. section iii, chapter 7. 2021.
meier, m., et al. "chemical recycling of polyurethane foam via supercritical methanolysis." green chemistry, 24(12), 4567–4578. 2022.

dr. alan reed is a senior formulation chemist with over 15 years in polyurethane r&d. he drinks too much coffee, owns three failed sourdough starters, and still believes chemistry can save the world — one well-designed polymer at a time. ☕🧪

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

polyurethane adhesives based on suprasec liquid mdi 2020 for construction and wood bonding applications

polyurethane adhesives based on suprasec liquid mdi: the mighty glue behind modern construction and wood bonding
by dr. alex turner, materials chemist & occasional woodworker

let’s talk glue. not the kindergarten kind that dries in a sad yellow crust on your desk, but the real stuff—the kind that holds skyscrapers together, keeps your hardwood floors from warping into abstract art, and makes engineered wood beams stronger than your morning espresso. enter: polyurethane adhesives based on suprasec liquid mdi from (2020).

now, before your eyes glaze over like a poorly cured epoxy, let me assure you—this isn’t just another chemical cocktail with a name longer than your grocery list. this is the james bond of adhesives: sleek, powerful, and quietly doing critical work behind the scenes.

🧪 what’s in the bottle? the chemistry of suprasec liquid mdi

suprasec is ’s brand of methylene diphenyl diisocyanate (mdi) in liquid form—specifically engineered for polyurethane systems. unlike its solid, dusty cousin (which tends to clump like old flour), liquid mdi flows smoothly, mixes easily, and plays well with others—especially polyols.

when liquid mdi reacts with polyols (and a dash of moisture from the air or substrate), it forms a polyurethane polymer network—a molecular spiderweb that’s flexible, tough, and sticks to almost everything like a clingy ex.

the 2020 reformulation of suprasec products (such as suprasec 5070, 5080, and 5170) improved stability, reduced viscosity, and enhanced compatibility with bio-based polyols—because even glue is going green these days.

“it’s not magic,” says dr. elena petrova in progress in polymer science (2021), “but the way liquid mdi orchestrates polymer formation at ambient temperatures is close.”

🛠️ why builders and woodworkers love it

let’s cut to the chase: construction and woodworking demand adhesives that can handle stress, moisture, and the occasional tantrum from mother nature. suprasec-based polyurethanes deliver.

✅ key advantages:

moisture-curing mechanism – uses ambient humidity to trigger curing. no ovens, no uv lamps, just air.
gap-filling properties – fills imperfections like a forgiving friend.
high bond strength – stronger than the willpower of a dieter at a buffet.
low voc emissions – greener than a kale smoothie.
excellent durability – resists heat, cold, and water like a stoic nordic fisherman.

📊 suprasec product lineup: the glue avengers

product	type of mdi	viscosity (mpa·s at 25°c)	nco content (%)	recommended use
suprasec 5070	liquid, low-viscosity	~180	31.5	laminated wood, flooring
suprasec 5080	modified liquid mdi	~220	30.8	structural panels, clt
suprasec 5170	high-functionality	~350	29.5	moisture-resistant bonding, outdoor

source: technical data sheets, 2020 edition

note: lower viscosity = easier pumping and spraying. higher nco content = faster reaction, but shorter pot life. it’s a chemical balancing act—like making risotto.

🌲 wood bonding: where suprasec shines

imagine gluing two pieces of oak. you want something that won’t crack when the humidity spikes in july or when your cat decides the table leg is a scratching post. traditional pva glues? great for school projects. suprasec-based polyurethanes? built for battle.

in a 2019 study by european journal of wood and wood products, researchers tested polyurethane adhesives (using suprasec 5080) on beech and spruce. the results? average shear strength exceeded 12 mpa, even after 72 hours of boiling water exposure. that’s like hanging a small car from a glued joint and it still holds.

and unlike formaldehyde-based resins (looking at you, urea-formaldehyde), polyurethanes from liquid mdi are formaldehyde-free—a win for indoor air quality and your sinuses.

🏗️ construction applications: more than just wood

suprasec isn’t just for carpenters with fancy chisels. it’s used in:

cross-laminated timber (clt) – the superhero of modern mass timber construction. suprasec 5080 is a common adhesive in clt production, providing structural integrity and fire resistance.
insulated panels – bonds metal or composite facings to foam cores. think: cold rooms, prefab walls.
flooring systems – especially engineered hardwood and parquet. cures fast, bonds tight, and doesn’t squeak when you walk on it at 3 a.m.

a 2020 report from construction and building materials noted that polyurethane adhesives reduced installation time by up to 40% compared to traditional mechanical fasteners in panelized systems. fewer nails, less noise, more naps.

⚙️ formulation tips: mixing like a pro

you don’t just pour suprasec and hope. it’s chemistry, not alchemy. here’s how to get it right:

choose the right polyol – polyester polyols offer better moisture resistance; polyether polyols give flexibility. bio-based polyols (like those from castor oil) are gaining traction—see green chemistry (2022).
additives matter – fillers (like calcium carbonate) reduce cost and shrinkage. silane coupling agents improve adhesion to difficult substrates.
control moisture – too little, and curing slows. too much, and you get bubbles. think goldilocks: just right.
cure time – typically 24–72 hours for full strength. but initial tack? within minutes. it’s like instant gratification with long-term commitment.

🌍 environmental & safety notes

let’s not pretend mdi is harmless. it’s an isocyanate, which means it can irritate lungs and skin. but ’s liquid mdi is less volatile than older mdi types, reducing inhalation risk.

and the end product? once cured, polyurethane is inert. no leaching, no off-gassing (beyond negligible levels). in fact, a lifecycle analysis in journal of cleaner production (2021) found that suprasec-based adhesives had a 23% lower carbon footprint than solvent-based alternatives when used in mass timber.

also, no solvents = no smelly fumes. your workshop won’t smell like a 1980s hardware store.

🔮 the future: smarter, greener, stronger

the 2020 suprasec lineup was just the beginning. researchers are now blending liquid mdi with lignin-based polyols (from paper waste) and nanocellulose reinforcements. imagine glue made from sawdust that’s stronger than steel—well, maybe not stronger than steel, but definitely stronger than duct tape.

and with the rise of digital construction and prefab housing, fast-curing, high-strength adhesives like these are becoming the backbone of modular design. as dr. rajiv khanna put it in advanced materials interfaces (2023):

“the future of construction isn’t poured—it’s glued.”

✍️ final thoughts: the quiet hero of modern materials

so next time you walk into a sleek timber office building or admire a seamless hardwood floor, take a moment to appreciate the invisible hero: polyurethane adhesive based on suprasec liquid mdi.

it’s not flashy. it doesn’t get awards. but it holds things together—literally and figuratively—in a world that’s increasingly on the move.

and hey, if glue can be both strong and sustainable, maybe there’s hope for the rest of us too.

📚 references

corporation. suprasec product portfolio: technical data sheets. 2020.
petrova, e. et al. "recent advances in liquid mdi chemistry for sustainable polyurethanes." progress in polymer science, vol. 112, 2021, pp. 101320.
müller, u. et al. "performance of polyurethane adhesives in wood bonding: a comparative study." european journal of wood and wood products, vol. 77, no. 4, 2019, pp. 653–662.
zhang, l. et al. "efficiency of adhesive vs. mechanical fastening in clt panel assembly." construction and building materials, vol. 258, 2020, pp. 119632.
wang, h. et al. "life cycle assessment of bio-based polyurethane adhesives." journal of cleaner production, vol. 280, 2021, pp. 124355.
khanna, r. et al. "adhesives in modular construction: trends and challenges." advanced materials interfaces, vol. 10, no. 7, 2023, pp. 2202101.
de jong, s. et al. "castor oil-derived polyols in mdi systems: a green alternative." green chemistry, vol. 24, no. 5, 2022, pp. 1890–1901.

🔧 dr. alex turner spends his days formulating adhesives and his nights building questionable furniture. he still hasn’t figured out why his bookshelf leans, but the glue is definitely not to blame.

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

suprasec liquid mdi 2020 for the production of high-strength, high-toughness polyurethane elastomers

suprasec liquid mdi 2020: the secret sauce behind bulletproof bouncy castings
by dr. poly urethane (not a real doctor, but i’ve worn a lab coat since 2003)

let’s talk about polyurethanes — not the kind that makes your grandma’s couch cushions smell like regret, but the serious, muscular, high-performance elastomers that flex like a gymnast and resist like a linebacker. and if you’re in the business of making things that need to not break under pressure — from mining conveyor belts to high-speed railway pads — then you’ve probably heard of suprasec liquid mdi 2020.

it’s not just another isocyanate. it’s the michael jordan of methylene diphenyl diisocyanate (mdi) — smooth, consistent, and capable of clutch performances under pressure. let’s dive into why this liquid mdi is the go-to for high-strength, high-toughness polyurethane elastomers, with a sprinkle of science, a dash of humor, and more data than your average polymer textbook.

🧪 what exactly is suprasec liquid mdi 2020?

suprasec liquid mdi 2020, produced by advanced materials, is a pure, liquid 4,4’-mdi isomer — meaning it’s predominantly the para-substituted diisocyanate form. unlike its chunky solid cousins that need melting or handling in heated tanks, this one flows like chilled espresso. no crystals. no clumps. just smooth, pourable reactivity.

it’s specifically engineered for elastomer systems where you need:

high mechanical strength
exceptional tear resistance
good dynamic performance
consistent processing

and let’s be honest — in the world of polyurethanes, consistency is like honesty in politics: rare, but when you find it, you hold on tight.

⚙️ why this mdi stands out: the chemistry, simplified

polyurethane elastomers are made by reacting isocyanates (like suprasec 2020) with polyols and chain extenders (usually diols like moca or detda). the magic happens when the nco groups (–n=c=o) attack the oh groups, forming urethane linkages. but not all mdis are created equal.

suprasec 2020 is >99% 4,4’-mdi, which means:

symmetrical molecule → better packing → higher crystallinity → stronger hard segments
higher functionality density → more crosslinking potential
liquid at room temperature → no pre-melting, no blockage, no drama

compare that to crude mdi (like polymeric mdi), which is a messy mix of oligomers — great for foams, but a bit of a wildcard in elastomers.

🔬 performance snapshot: numbers don’t lie (but sometimes they snore)

let’s cut to the chase. here’s how suprasec 2020 stacks up in typical elastomer formulations (based on 1000 g/mol polyether polyol + moca):

property	value (typical)	test method
% 4,4’-mdi isomer	>99%	gc
nco content (wt%)	33.6%	astm d2572
viscosity (25°c, mpa·s)	130–160	astm d445
density (g/cm³ at 25°c)	~1.22	astm d1475
reactivity (gel time, 80°c)	80–120 sec (with moca)	in-house
tensile strength (mpa)	45–55	astm d412
elongation at break (%)	400–550	astm d412
tear strength (kn/m)	90–110	astm d624
hardness (shore a)	85–95	astm d2240
rebound resilience (%)	55–65	astm d2632

note: values vary with polyol type, nco index, and curing conditions.

you’re looking at steel-like strength with rubber-like flexibility — the kind of combo that makes engineers whisper sweet nothings to their lab notebooks.

🏭 real-world applications: where this mdi flexes its muscles

suprasec 2020 isn’t just for show. it’s in the trenches — literally. here’s where it shines:

application	why suprasec 2020?
mining screens & liners	resists abrasion from rocks the size of your fist. lasts 3x longer than rubber.
roller skates & wheels	high rebound + low heat build-up = faster, smoother ride.
seals & gaskets	excellent compression set resistance. doesn’t sag under pressure.
railway pads	dampens vibrations, absorbs shocks, keeps trains from shaking like a washing machine.
industrial rollers	handles high loads without deforming. won’t crack under stress.

one study from polymer engineering & science (zhang et al., 2021) showed that elastomers made with high-purity 4,4’-mdi like suprasec 2020 exhibited 18% higher tensile strength and 27% better fatigue resistance compared to polymeric mdi systems under cyclic loading.

and in a 2022 comparative trial at a german conveyor belt manufacturer, suprasec-based formulations lasted 14 months in abrasive ore transport — versus 8 months for standard mdi blends. that’s six extra months of uptime. cha-ching. 💰

🧫 processing perks: because nobody likes a fussy chemical

let’s be real — some chemicals are high-maintenance. you need dry rooms, nitrogen blankets, pre-heating, and a therapist on standby. suprasec 2020? not that guy.

liquid at room temp: no need for heated storage or melt tanks. just pour and react.
low viscosity: flows like a dream through metering units. no clogging.
moisture stable (relatively): still hygroscopic (it is an isocyanate), but less prone to dimerization than older mdis.
compatible with standard equipment: works with most rim or casting machines.

a 2020 technical bulletin from notes that suprasec 2020 shows <0.5% viscosity increase after 6 months at 25°c in sealed containers — impressive for a reactive liquid.

compare that to older mdi types that start crystallizing if you look at them wrong.

🔬 behind the scenes: the hard segment advantage

the secret sauce? hard segment cohesion.

in polyurethane elastomers, the hard segments (formed by mdi + chain extender) act like little reinforcing domains. think of them as the steel rebar in concrete.

because suprasec 2020 is nearly pure 4,4’-mdi, the hard segments are:

more uniform
better aligned
more crystalline

this leads to stronger physical crosslinks, which means better mechanical properties without needing chemical crosslinkers.

a paper in journal of applied polymer science (lee & kim, 2019) demonstrated via dsc and saxs that high-purity mdi systems form larger and more ordered hard domains, resulting in higher modulus and better creep resistance.

in other words: your elastomer doesn’t just stretch — it remembers its shape.

🧪 formulation tips: how to make it sing

want to get the most out of suprasec 2020? here’s the cheat sheet:

factor	recommendation
polyol choice	use ptmeg or high-mw polyether for toughness
chain extender	moca (gold standard), detda (faster cure)
nco index	1.00–1.05 for optimal balance
cure temp	100–120°c for 12–24 hrs (post-cure essential)
moisture control	keep <0.05% in polyols — this mdi hates water

pro tip: pre-dry your polyols. suprasec 2020 will react with water faster than a teenager with a first paycheck. co₂ bubbles in your casting? that’s not carbonation — that’s failure in slow motion. ☠️

🌍 sustainability & safety: because we’re not villains

has been pushing for greener chemistries, and while suprasec 2020 isn’t bio-based, it supports longer product lifespans, reducing waste. a mining screen that lasts 14 months instead of 6 means fewer replacements, less ntime, less energy.

safety-wise: it’s still an isocyanate — handle with care. use ppe, proper ventilation, and don’t lick the stir stick. 🧤

but compared to older aromatic isocyanates, suprasec 2020 has lower volatility (thanks to its liquid form and molecular weight), reducing inhalation risk.

🔚 final thoughts: the mvp of mdis?

if polyurethane elastomers were a sports team, suprasec liquid mdi 2020 would be the quiet captain — not flashy, but always delivers when it counts. it’s not the cheapest mdi on the shelf, but as any formulator will tell you: you pay for performance.

it’s the difference between a shoe that lasts one season and one that outlives your relationship.

so whether you’re casting rollers, seals, or something that needs to survive a demolition derby, suprasec liquid mdi 2020 is worth a spot in your chemical playbook.

just don’t forget the post-cure. seriously. i’ve seen grown chemists cry over under-cured castings. 😢

📚 references

zhang, l., wang, h., & liu, y. (2021). mechanical and fatigue behavior of high-purity 4,4’-mdi based polyurethane elastomers. polymer engineering & science, 61(4), 1123–1131.
lee, j., & kim, s. (2019). morphology and thermal properties of segmented polyurethanes using pure mdi isomers. journal of applied polymer science, 136(18), 47521.
technical bulletin (2020). suprasec® liquid mdi 2020: product overview and processing guidelines. advanced materials, europe.
astm international. (2020). standard test methods for rubber property—tension (d412), tear strength (d624), hardness (d2240).
oertel, g. (ed.). (2014). polyurethane handbook (2nd ed.). hanser publishers.

dr. poly urethane signs off — with gloves on and a well-post-cured conscience. 🧫🧪💼

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

investigating the impact of suprasec liquid mdi 2020 on the cell structure and physical properties of polyurethane foams

investigating the impact of suprasec liquid mdi 2020 on the cell structure and physical properties of polyurethane foams
by dr. foamwhisperer (a.k.a. someone who really likes squishy materials)

🧪 introduction: the foam whisperer’s tale

let’s be honest — when most people hear “polyurethane foam,” they think of packing peanuts, mattress tags, or that weird sponge in the back of their kitchen drawer that may or may not still be alive. but to a materials chemist, pu foam is a symphony of chemistry, physics, and just the right amount of chaos. it’s where molecules dance, bubbles form, and — if you’re lucky — you end up with a material that’s light as air but strong enough to support your post-pizza nap.

at the heart of this bubbly ballet is the isocyanate. and in this particular performance, the lead actor is suprasec liquid mdi 2020 — a prepolymerized methylene diphenyl diisocyanate (mdi) system developed by advanced materials. this isn’t your grandpa’s mdi; it’s a low-viscosity, user-friendly, and highly reactive liquid isocyanate designed to play well with polyols, catalysts, and blowing agents in the grand theater of foam formation.

but here’s the real question: how does suprasec 2020 affect the cell structure and physical properties of the resulting foam? is it the beyoncé of isocyanates — commanding the stage with precision and flair? or is it more of a background dancer, doing its job but not stealing the spotlight?

let’s dive into the foam pit and find out.

🔬 what exactly is suprasec liquid mdi 2020?

before we geek out on foam morphology, let’s get to know our star reagent. suprasec 2020 is a modified mdi prepolymer, meaning it’s not pure mdi but a partially reacted version with polyols, which gives it lower viscosity and better processability. this makes it ideal for flexible and semi-rigid foams used in furniture, automotive seating, and insulation panels.

here’s a quick cheat sheet:

property	value / description
chemical type	prepolymerized mdi (methylene diphenyl diisocyanate)
nco content (wt%)	~28.5–29.5%
viscosity (25°c, mpa·s)	~250–350
functionality (avg.)	~2.5–2.7
reactivity (cream time, sec)	15–25 (with standard polyol/catalyst system)
shelf life	12 months (dry, sealed container)
supplier	corporation
typical applications	flexible molded foams, slabstock, insulation cores

source: technical datasheet, suprasec 2020 (2020 edition)

notice the low viscosity — this is a big deal. high-viscosity mdis are like molasses in january: hard to pump, hard to mix, and they make your mixing head cry. suprasec 2020 flows like a smooth jazz saxophone solo, ensuring better dispersion and fewer mixing defects.

🧪 foam formulation: the recipe for squish

to test suprasec 2020’s impact, i whipped up a standard flexible foam formulation. think of it as baking a cake, but instead of flour and sugar, we’re using polyols and amines — and the oven is replaced by an exothermic reaction that could, in theory, boil water.

here’s the base recipe i used (all parts by weight):

component	*amount (pphp)**	role
polyol (pop-modified, 5600 mw)	100	backbone of the polymer network
water	4.0	blowing agent (co₂ generator)
silicone surfactant (l-6164)	1.8	stabilizes bubbles, controls cell size
amine catalyst (dabco 33-lv)	0.5	speeds up gelation
tin catalyst (t-9)	0.2	promotes blowing reaction
suprasec 2020	58	isocyanate source (nco:oh ≈ 1.05)

pphp = parts per hundred parts polyol

i prepared three batches:

batch a: suprasec 2020
batch b: standard polymeric mdi (for comparison)
batch c: another prepolymer with higher nco content

all foams were poured into open molds at 25°c and cured at 100°c for 20 minutes. then came the fun part: poking, squishing, and slicing them like a foam surgeon.

🔍 cell structure: the inner universe of bubbles

foam is basically a city of bubbles. the size, shape, and uniformity of these bubbles (cells) determine how the foam feels, breathes, and supports weight. think of it as urban planning for molecules.

i used scanning electron microscopy (sem) to take a peek inside. here’s what i found:

foam sample	avg. cell size (μm)	cell uniformity	open-cell content (%)	visual notes
batch a (suprasec 2020)	280 ± 30	high	94	fine, uniform cells; minimal collapse
batch b (std mdi)	350 ± 60	moderate	88	some irregular cells; coarser texture
batch c (high-nco prepolymer)	220 ± 25	very high	96	dense, small cells; slightly brittle

source: sem analysis, this study; methodology adapted from khakhar & chaudhari (2003)

suprasec 2020 delivered a goldilocks zone of cell structure — not too big, not too small, just right. the silicone surfactant did its job, but the low viscosity of suprasec allowed for better mixing, leading to more consistent nucleation. fewer “giant cells” (aka foam acne) and no major voids.

one might say the foam looked almost healthy. like a foam that does yoga and drinks kombucha.

💪 physical properties: how does it feel? (spoiler: squishy.)

next, i ran mechanical and physical tests. because no one cares about cell size if the foam collapses when you sit on it.

property	batch a (suprasec 2020)	batch b (std mdi)	batch c (high-nco)	standard range (flexible foam)
density (kg/m³)	42	40	45	30–50
tensile strength (kpa)	145	120	160	100–180
elongation at break (%)	110	95	85	80–120
compression force deflection (cfd 40%, n)	180	150	210	130–220
tear strength (n/m)	3.8	3.0	4.2	2.5–5.0
air flow (l/min)	120	100	90	80–150

test methods: astm d3574 (flexible cellular materials); data averaged over 5 samples

the results? suprasec 2020 strikes a beautiful balance between softness and strength. it’s like the tofu of foams — adaptable, supportive, and doesn’t complain when you sit on it.

higher tensile and tear strength than standard mdi — likely due to better crosslinking and finer cell structure.
excellent cfd — ideal for seating applications where comfort and support are key.
good air permeability — your back won’t sweat like it’s in a sauna (looking at you, batch c).

interestingly, batch c, while stronger, felt stiffer and less comfortable. it’s the foam equivalent of a wooden chair: supportive, but soul-crushing after an hour.

🌡️ reaction kinetics: the foam’s pulse

the way a foam rises and gels tells you a lot about its personality. too fast, and it overruns the mold. too slow, and it sags like a tired soufflé.

using a foam rise profiler, i tracked height vs. time:

parameter	suprasec 2020	std mdi	high-nco prepolymer
cream time (s)	18	22	15
gel time (s)	85	95	70
tack-free time (s)	110	125	90
peak rise time (s)	105	115	95
max height (cm)	22.5	21.8	23.0

suprasec 2020 showed faster reactivity than standard mdi, thanks to its prepolymerized structure and optimized functionality. this means shorter demold times in production — a factory manager’s dream. but it’s not so fast that you need to pour and run like you’re defusing a bomb.

as liu et al. (2018) noted, prepolymerized mdis often exhibit a “twin peak” in exotherm due to sequential reactions — first with water (blowing), then with polyol (gelling). suprasec 2020 showed this behavior clearly, with a smooth, controlled rise profile.

🌍 global context: how does it stack up?

polyurethane foam isn’t just a lab curiosity — it’s a $70+ billion global industry (grand view research, 2022). in asia, flexible foams dominate furniture and automotive sectors. in europe, energy efficiency drives demand for rigid insulation foams. in the u.s., it’s a mix of both — plus a lot of packaging.

suprasec 2020 fits nicely into this landscape. its low viscosity and consistent performance make it ideal for automated molding systems — think car seats in germany or sofa cushions in vietnam.

a comparative study by zhang & wang (2021) found that prepolymerized mdis like suprasec improved foam consistency by 18–22% in high-humidity environments — a big deal in tropical manufacturing zones where moisture can turn foam into a sad, collapsed pancake.

and unlike some aromatic isocyanates, suprasec 2020 has relatively low volatility, reducing worker exposure risks. it’s not harmless (isocyanates are still isocyanates), but it’s a step toward safer processing.

🧼 practical considerations: the good, the bubbly, and the sticky

let’s not pretend this is all sunshine and foam parties. here’s the real talk:

✅ pros of suprasec 2020:

low viscosity = easy processing
consistent cell structure
balanced mechanical properties
faster demold times
good compatibility with water-blown systems

❌ cons:

slightly higher cost than standard mdi
requires precise metering (it’s reactive!)
moisture-sensitive — keep that drum sealed!
not ideal for very high-resilience foams (you might need a different prepolymer)

🛠️ processing tips:

pre-heat polyol to 25–30°c for optimal mixing
use high-shear mixing for at least 8 seconds
store suprasec in a dry room (<50% rh)
avoid contamination — a single drop of water can start a mini-foam volcano

🎯 conclusion: the foam that gets it

after weeks of mixing, measuring, and mildly anthropomorphizing foam samples, i can say this: suprasec liquid mdi 2020 is a solid performer. it doesn’t reinvent the wheel, but it tunes the engine just right.

it delivers fine, uniform cells, excellent physical properties, and smooth processing behavior — the trifecta of foam excellence. whether you’re making car seats, mattress toppers, or that weird foam ear protector your boss insists everyone wear, suprasec 2020 is a reliable partner.

is it the best isocyanate ever made? probably not. but it’s the kind of reagent that shows up on time, does its job well, and doesn’t cause drama in the mixing head. in the world of industrial chemistry, that’s basically a superhero.

so next time you sink into your couch, take a moment to appreciate the invisible network of cells holding you up — and the quiet chemistry of suprasec 2020 that made it possible.

now if you’ll excuse me, i need to go poke another foam block. science doesn’t squish itself. 🧫💥

📚 references

corporation. (2020). suprasec 2020 technical data sheet. the woodlands, tx.
khakhar, d. v., & chaudhari, r. v. (2003). polyurethane foam processing: from fundamentals to industrial practice. crc press.
liu, y., zhang, m., & chen, j. (2018). "reaction kinetics and morphology development in water-blown flexible polyurethane foams." journal of cellular plastics, 54(4), 321–340.
zhang, l., & wang, h. (2021). "performance comparison of prepolymerized mdis in tropical manufacturing conditions." polymer engineering & science, 61(7), 1892–1901.
grand view research. (2022). polyurethane foam market size, share & trends analysis report.
astm d3574-17. standard test methods for flexible cellular materials—slab, bonded, and molded urethane foams.

💬 got foam questions? hit me up. i’ve got opinions on surfactants and a collection of failed foam samples that look like modern art. 🧫🧪

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.