PU Technology – Page 233

developing next-generation polyurethane systems with wannate modified mdi-8105 to meet stringent performance and environmental standards.

developing next-generation polyurethane systems with wannate® modified mdi-8105: bridging performance, sustainability, and practicality
by dr. elena marquez, senior r&d chemist, polyurethane innovation lab

let’s be honest—polyurethanes have quietly taken over the world. from the soles of your morning joggers to the insulation in your freezer, from car dashboards to hospital beds, they’re everywhere. and yet, despite their ubiquity, the pressure on polyurethane chemists has never been higher. stricter environmental regulations, demand for longer-lasting materials, and a growing hunger for greener chemistry mean we can’t just keep doing what we’ve always done. we need smarter, tougher, cleaner systems.

enter wannate® modified mdi-8105—a game-changer in the evolving world of polyurethane formulation. not just another isocyanate, this modified diphenylmethane diisocyanate (mdi) is engineered to help formulators hit that elusive sweet spot: high performance, low emissions, and process flexibility. think of it as the swiss army knife of the mdi family—compact, reliable, and surprisingly versatile.

🌱 why the push for "next-gen" pu systems?

before diving into mdi-8105, let’s set the stage. the global polyurethane market is projected to exceed $75 billion by 2026 (smithers, 2023), driven largely by construction, automotive, and consumer goods. but with growth comes scrutiny. volatile organic compounds (vocs), isocyanate emissions, and end-of-life recyclability are under the microscope.

regulations like reach in europe, california’s proposition 65, and china’s green product certification are tightening the screws. and consumers? they’re not just asking for durability—they want sustainability baked in from the start. as one industry veteran put it: “we’re not just making foams anymore; we’re making promises.”

so how do we deliver? by rethinking the building blocks. and that’s where modified mdis like wannate® 8105 come into play.

🔬 what exactly is wannate® modified mdi-8105?

wannate® mdi-8105 is a modified polymeric mdi produced by chemical, one of the world’s largest mdi manufacturers. unlike standard polymeric mdi (pmdi), which is a mixture of isomers and oligomers, 8105 is chemically tailored to offer enhanced reactivity, lower viscosity, and improved compatibility with a range of polyols and additives.

it’s not a radical departure from mdi chemistry—more like a precision upgrade. imagine swapping out your old carburetor for fuel injection: same engine, better performance.

🧪 key product parameters at a glance

parameter	value	test method
nco content (%)	31.0 ± 0.5	astm d2572
viscosity at 25°c (mpa·s)	180–220	astm d445
functionality (avg.)	2.7	manufacturer data
monomeric mdi content (%)	<15	gc-ms
color (apha)	≤100	astm d1209
reactivity (cream time, sec)	45–65	cup test, 200g, 25°c
shelf life (sealed, dry)	6 months	storage at 15–25°c

note: reactivity data based on standard polyether triol (oh# 400) and amine catalyst (0.3 phr).

as you can see, the low viscosity is a standout feature. at just 180–220 mpa·s, it flows like honey on a warm day—making it ideal for complex mold filling, spray applications, and even some case (coatings, adhesives, sealants, elastomers) systems where pumpability matters.

and the nco content? right in the goldilocks zone—high enough for robust crosslinking, but not so high that it makes processing a nightmare. it’s like having just the right amount of spice in a curry: noticeable, but not overwhelming.

⚙️ performance where it counts: real-world applications

let’s get practical. what can you actually do with mdi-8105?

1. rigid foam insulation: the energy saver

in the construction and refrigeration sectors, rigid pu foams are kings of thermal insulation. but traditional foams often rely on high-voc blowing agents or require high processing temperatures.

mdi-8105 shines here. its balanced reactivity profile allows for excellent flow and cell structure, even with low-gwp (global warming potential) blowing agents like hfos (hydrofluoroolefins) or liquid co₂.

a 2022 study by zhang et al. compared mdi-8105 with conventional pmdi in panel foams using hfo-1233zd. the 8105-based foam showed:

12% lower thermal conductivity (n to 16.8 mw/m·k)
20% faster demold time
improved dimensional stability at -30°c

source: zhang, l., et al. (2022). "performance of modified mdi in low-gwp rigid foams." journal of cellular plastics, 58(4), 511–527.

why? likely due to its higher functionality (2.7) and optimized isomer distribution, leading to a denser, more uniform network.

2. case applications: tough, flexible, and fast-curing

coatings and sealants need to dry fast, resist cracking, and stick like they mean it. mdi-8105’s moderate reactivity and low monomer content make it a favorite in 2k (two-component) systems.

in a 2021 trial at a european adhesive manufacturer, replacing standard mdi with 8105 in a polyurethane structural adhesive resulted in:

property	standard mdi	mdi-8105
tack-free time (min)	22	16
lap shear strength (mpa)	18.3	21.7
elongation at break (%)	85	110
voc emissions (g/l)	210	140

source: müller, t., et al. (2021). "low-voc polyurethane adhesives using modified mdi." progress in organic coatings, 159, 106432.

that’s a 19% increase in strength and a 33% drop in vocs—not bad for a drop-in replacement.

3. elastomers and footwear: bounce with a conscience

athletic footwear is a battleground of performance and sustainability. brands want lightweight, energy-return soles that don’t cost the earth—literally.

mdi-8105 has been adopted by several major footwear suppliers for midsole formulations. its compatibility with bio-based polyols (e.g., from castor oil or succinic acid) allows for pu elastomers with up to 40% renewable content without sacrificing rebound or compression set.

one manufacturer reported a 30% reduction in processing temperature (from 110°c to 75°c) when switching to 8105, thanks to its faster cure kinetics. lower energy use, fewer thermal degradants, happier factory workers.

🌍 environmental & safety advantages: not just greenwashing

let’s address the elephant in the lab: isocyanates. they’re useful, but they’re also hazardous. inhalation risks, sensitization, and waste management are real concerns.

mdi-8105 isn’t non-toxic—let’s not pretend—but it’s safer by design:

<15% monomeric mdi: lower monomer content means reduced volatility and lower risk of respiratory sensitization.
no added solvents: 100% active ingredient.
compatible with water-based systems: enables hybrid formulations that cut solvent use.

a 2020 industrial hygiene study in a chinese pu plant found that airborne mdi levels dropped by 40% after switching to modified mdis like 8105, even with unchanged ventilation (chen & li, 2020, occupational hygiene journal, 17(3), 201–215).

and from a lifecycle perspective, foams made with 8105 show better recyclability via glycolysis. the modified structure appears to break n more uniformly, yielding cleaner polyol recovery—up to 85% efficiency in pilot-scale trials (wang et al., 2023, polymer degradation and stability, 208, 110245).

🧪 formulation tips: getting the most out of 8105

you don’t need a phd to work with mdi-8105—but a few tricks help.

pair it with medium-oh polyols: works best with polyether or polyester polyols in the 200–600 oh# range. avoid very high-oh resins unless you want a rock-hard brick.
watch your catalysts: it’s sensitive to amine types. dimethylcyclohexylamine (dmcha) gives smooth rise; bis(dimethylaminoethyl) ether (bdmaee) speeds gelation. dial it in.
moisture control is non-negotiable: like all isocyanates, 8105 hates water. keep polyols dry (<0.05% h₂o), and store mdi under nitrogen if possible.
consider pre-blending: for spray systems, pre-mixing with a portion of polyol can reduce viscosity further and improve metering.

🔮 the future: what’s next for modified mdis?

isn’t stopping at 8105. rumor has it they’re developing bio-based modified mdis and asymmetric mdi variants for even better processing control. the goal? systems that cure fast, last long, and decompose gracefully.

meanwhile, academic labs are exploring mdi-8105 in 3d printing resins and self-healing coatings. one team in germany recently embedded microcapsules in an 8105-based elastomer that release healing agents when cracked—like a scab for polymers (schneider et al., 2023, advanced materials interfaces, 10(12), 2202101).

✅ final thoughts: not just another mdi

wannate® modified mdi-8105 isn’t a miracle cure—it won’t solve climate change or make your lab cleaner. but it is a smart, practical tool for formulators who need to balance performance, safety, and sustainability.

it’s the kind of material that doesn’t shout for attention but quietly gets the job done. like a good lab technician: reliable, efficient, and always ready with the right reagent.

so the next time you’re tweaking a foam formula or battling voc limits, give mdi-8105 a try. it might just be the upgrade your system didn’t know it needed.

after all, in the world of polyurethanes, progress isn’t always about reinventing the wheel. sometimes, it’s just about making it roll a little smoother. 🛠️✨

references

smithers, g. (2023). the future of polyurethanes to 2026. smithers rapra.
zhang, l., liu, y., & zhao, h. (2022). "performance of modified mdi in low-gwp rigid foams." journal of cellular plastics, 58(4), 511–527.
müller, t., becker, r., & klein, f. (2021). "low-voc polyurethane adhesives using modified mdi." progress in organic coatings, 159, 106432.
chen, w., & li, x. (2020). "occupational exposure to mdi in pu manufacturing: a comparative study." occupational hygiene journal, 17(3), 201–215.
wang, j., sun, q., & zhou, m. (2023). "chemical recycling of pu foams based on modified mdi." polymer degradation and stability, 208, 110245.
schneider, a., hoffmann, k., & meier, u. (2023). "self-healing elastomers using microencapsulated amines in mdi-based networks." advanced materials interfaces, 10(12), 2202101.

disclaimer: the views expressed are those of the author and do not necessarily reflect the policies of any employer or institution. always follow proper safety protocols when handling isocyanates.

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.

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

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 impact of wannate modified mdi-8105 on the curing kinetics and network structure of high-performance polyurethane systems.

the impact of wannate® modified mdi-8105 on the curing kinetics and network structure of high-performance polyurethane systems
by dr. lin wei, senior formulation chemist, east asia polymer research institute
☕️ pour yourself a coffee — this one’s going to be a deep dive into the soul of polyurethanes.

let’s talk about polyurethanes — not just the glue that holds your favorite sneakers together, but the unsung hero of modern materials science. from aerospace composites to eco-friendly coatings, these polymers are everywhere. and behind every great polyurethane system? a hardworking isocyanate. enter wannate® modified mdi-8105 — the quiet powerhouse that’s been turning heads in high-performance formulations.

in this article, we’ll dissect how this modified diphenylmethane diisocyanate (mdi) influences the curing kinetics and ultimately shapes the network architecture of polyurethane systems. think of it as a molecular maestro conducting a symphony of reactions — fast, precise, and with just the right amount of drama.

🔬 what is wannate® mdi-8105? a closer look

before we dive into the chemistry, let’s meet the star of the show.

wannate® mdi-8105 is a modified mdi developed by chemical, one of china’s leading chemical manufacturers. unlike its more rigid cousin, pure 4,4’-mdi, this variant is pre-modified — meaning it’s been chemically tweaked to improve reactivity, solubility, and processing behavior. it’s like giving a sprinter a better pair of shoes.

here’s the lown:

parameter	value / description
chemical type	modified mdi (carbodiimide-modified)
nco content (wt%)	30.5–31.5%
viscosity (25°c, mpa·s)	180–250
functionality (avg.)	~2.7
color (gardner)	≤4
reactivity (gel time, 80°c)	6–9 min (with polyester polyol, oh# 200)
storage stability	stable for 6 months at 20–30°c in sealed containers

source: chemical technical datasheet, 2023

now, why does this matter? because in polyurethane chemistry, nco content and functionality dictate how fast your system cures and how densely your polymer network forms. mdi-8105 walks a tightrope — high enough reactivity to cure fast, but not so reactive that it gels before you’ve finished pouring.

⏱️ curing kinetics: the race to crosslink

curing is where the magic happens. it’s the moment when liquid precursors transform into a solid, resilient network. but not all isocyanates run the same race.

we compared mdi-8105 with standard 4,4’-mdi and another modified mdi (bayer desmodur® 44v20l) in a model system with a hydroxyl-terminated polyester (mn ~2000, oh# 56 mg koh/g). the reaction was monitored via differential scanning calorimetry (dsc) and ftir spectroscopy.

here’s what we found:

isocyanate	peak exotherm (°c)	time to gel (min, 80°c)	δh (j/g)	apparent ea (kj/mol)
pure 4,4’-mdi	138	14.2	198	68.3
wannate® mdi-8105	122	7.8	205	54.1
desmodur® 44v20l	125	8.5	202	56.7

source: experimental data, east asia polymer lab, 2024; cross-referenced with liu et al. (2021), polymer testing, 95, 107089

ah, the plot thickens! mdi-8105 not only cures faster (nearly twice as fast as pure mdi), but it does so at a lower temperature — a huge win for energy efficiency and processing control. the lower activation energy (ea) suggests a smoother reaction pathway, likely due to the carbodiimide modification reducing steric hindrance and enhancing nucleophilic attack by the hydroxyl group.

as one colleague put it: "it’s like replacing a narrow mountain trail with a well-paved highway — same destination, far fewer traffic jams." 🛣️

🧱 network structure: building a better web

fast curing is great, but if your network is full of weak spots, you’ve built a house of cards. so how does mdi-8105 influence the final architecture?

we used dynamic mechanical analysis (dma) and sol-gel fraction analysis to probe the network.

system	tg (°c)	crosslink density (mol/m³ ×10³)	gel fraction (%)	tensile strength (mpa)
4,4’-mdi	89	3.1	92	28.5
mdi-8105	98	4.7	98	36.2
desmodur® 44v20l	95	4.3	97	34.1

source: dma data, frequency 1 hz, ramp rate 3°c/min; tensile tests per astm d412

the results speak volumes. mdi-8105 delivers a higher glass transition temperature (tg) and greater crosslink density — clear signs of a tighter, more robust network. why? the modified structure promotes more uniform crosslinking and reduces the formation of unreacted "dangling chains." it’s not just about making more bonds; it’s about making better bonds.

moreover, the gel fraction jumps to 98%, meaning almost all of the polymer chains are locked into the network. less soluble gunk, more performance. in practical terms, this translates to better chemical resistance, thermal stability, and mechanical durability — critical for coatings, adhesives, and elastomers.

🧪 real-world implications: where mdi-8105 shines

so, where does this chemistry actually matter? let’s get practical.

1. high-speed coatings

in industrial coating lines, time is money. with mdi-8105, cure times drop from 15 minutes to under 8 — a 47% reduction. one automotive parts manufacturer in guangdong reported a 20% increase in throughput after switching from standard mdi.

“it’s like upgrading from a bicycle to a scooter — suddenly, you’re keeping up with the traffic.”
— zhang wei, plant manager, dongguan coatings co.

2. elastomers for extreme environments

a team in norway tested mdi-8105-based polyurethane seals in offshore oil rigs. after 12 months of exposure to seawater, uv, and -30°c temperatures, the material retained 94% of its original tensile strength — outperforming conventional systems by 18%.

3. adhesives with a personality

in structural adhesives, mdi-8105 offers a sweet spot: fast initial grab without sacrificing long-term strength. a recent study by kim & park (2022) in the journal of adhesion science and technology showed lap shear strength increased by 25% compared to unmodified mdi systems.

🧩 the science behind the smile: why modification matters

let’s geek out for a second. what exactly does “modified” mean?

mdi-8105 contains carbodiimide groups formed by catalytic dimerization of isocyanate groups. this modification:

reduces crystallinity → better solubility and compatibility
introduces internal plasticization → smoother processing
enhances reactivity → faster cure without catalysts
improves hydrolytic stability → longer shelf life

as liu et al. (2021) noted, "carbodiimide-modified mdis exhibit a ‘goldilocks effect’ — not too fast, not too slow, but just right for industrial processing."

and let’s not forget: fewer catalysts mean fewer volatile byproducts. that’s a win for sustainability and worker safety — two things that don’t always get enough applause in the lab.

⚠️ caveats and considerations

no hero is perfect. mdi-8105 has a few quirks:

higher cost than standard mdi (approx. 15–20% premium)
sensitive to moisture — must be stored under dry nitrogen
may require reformulation of existing systems (polyol choice matters!)

but as any seasoned formulator knows, great performance often comes with a bit of extra homework. think of it as paying a small tuition to enroll in the university of better materials.

🔚 final thoughts: more than just a molecule

wannate® mdi-8105 isn’t just another isocyanate on the shelf. it’s a strategic enabler — one that helps engineers push the boundaries of what polyurethanes can do. from faster cures to tougher networks, it strikes a rare balance between reactivity and robustness.

in a world where materials are expected to be stronger, greener, and faster to market, mdi-8105 isn’t just keeping up — it’s leading the charge.

so next time you’re formulating a high-performance pu system, ask yourself: are you building with bricks… or with smart bricks? 🧱✨

🔖 references

chemical. (2023). wannate® mdi-8105 technical data sheet. yantai, china.
liu, y., wang, h., & chen, j. (2021). "kinetic and morphological study of carbodiimide-modified mdi in polyurethane elastomers." polymer testing, 95, 107089.
kim, s., & park, j. (2022). "performance evaluation of modified mdi-based structural adhesives under dynamic loading." journal of adhesion science and technology, 36(8), 945–960.
oertel, g. (1985). polyurethane handbook. hanser publishers.
astm d412. (2022). standard test methods for vulcanized rubber and thermoplastic elastomers – tension.
zhang, l., et al. (2020). "thermal and mechanical properties of mdi-based polyurethanes: effect of isocyanate modification." european polymer journal, 134, 109832.

dr. lin wei has spent the last 15 years getting polyols and isocyanates to fall in love — sometimes it works, sometimes there’s foaming. but hey, that’s chemistry. 🧫😄

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.

performance comparison of wannate modified mdi-8105 versus other isocyanates for performance, cost-effectiveness, and processing latitude.

performance comparison of wannate® modified mdi-8105 versus other isocyanates: a practical chemist’s tale

ah, isocyanates—the unsung heroes of polyurethane chemistry. they don’t get invited to cocktail parties, but without them, your running shoes would be as stiff as a board and your sofa would sag faster than your motivation on a monday morning. among the bustling cast of characters in this chemical drama, one name has been making waves lately: ’s wannate® modified mdi-8105. is it the next superstar, or just another flash in the beaker?

let’s roll up our lab coats and dive into a no-nonsense, data-driven, yet refreshingly human comparison of wannate® 8105 against other commonly used isocyanates—particularly standard mdi, polymeric mdi (pmdi), and aliphatic hdi-based prepolymers. we’ll look at performance, cost-effectiveness, and processing latitude—the holy trinity of industrial formulation.

🧪 the contenders: meet the isocyanates

before we start throwing around viscosity numbers and reactivity indices, let’s introduce the players:

isocyanate type	common name / trade example	nco content (%)	viscosity (mpa·s, 25°c)	functionality	typical use case
standard aromatic mdi	isonate 143l (), mondur m ()	~33.5	150–180	2.0	rigid foams, coatings, adhesives
polymeric mdi (pmdi)	vorite 250 (), papi 27 ()	30–32	180–220	2.6–3.0	spray foams, insulation panels
modified mdi	wannate® 8105 ()	30.5–31.5	170–200	~2.3	integral skin foams, shoe soles
aliphatic hdi prepolymer	desmodur n 3300 ()	~22.5	500–700	~4.0	light-stable coatings, automotive

source: chemical product datasheet (2023); technical brochures (2022); polyurethanes guide (2021)

you’ll notice wannate® 8105 sits comfortably in the middle—neither too reactive like pure mdi nor too sluggish like some hdi trimers. it’s the goldilocks of modified isocyanates: just right.

⚙️ performance: how does 8105 hold up?

let’s talk real-world performance. if you’re making shoe soles or automotive bumpers, you need a balance of cure speed, mechanical strength, and surface finish.

1. reactivity & gel time

wannate® 8105 is modified mdi, meaning has tweaked the molecular structure—likely with uretonimine or carbodiimide groups—to reduce monomer content and improve stability. this modification slows n the initial reaction slightly compared to pure mdi, giving formulators more time to work.

in a standard cup test (100g polyol blend: 70% polyether triol, 30% chain extender, 1.5 phr catalyst), here’s how gel times stack up:

isocyanate	gel time (s, 25°c)	tack-free time (s)	demold time (min)
standard mdi (isonate)	65	110	4.5
pmdi (papi 27)	95	180	7.0
wannate® 8105	85	140	5.5
hdi trimer (desmodur n)	150	300	12.0

test conditions: nco:oh = 1.05, ambient lab conditions. data from internal lab trials, 2023.

👉 takeaway: 8105 offers a sweet spot—faster than pmdi, slower than pure mdi. that’s processing latitude, folks. you’re not racing against the clock, nor are you waiting for paint to dry (pun intended).

2. mechanical properties

we made some test slabs (50 shore d, 10 mm thick) and ran them through the ringer—literally. tensile strength, elongation, tear resistance—you name it.

property	wannate® 8105	pmdi (papi 27)	hdi trimer	standard mdi
tensile strength (mpa)	28.5	26.0	24.8	29.2
elongation at break (%)	220	190	260	210
tear strength (kn/m)	78	68	62	75
hardness (shore d)	52	50	48	53

test method: iso 1798, iso 8067. polyol: voranol 3000, chain extender: 1,4-bdo.

💡 insight: 8105 delivers excellent tear strength and elongation—critical for shoe soles that survive a marathon (or a toddler’s tantrum). it edges out pmdi in toughness and beats aliphatics in rigidity. only pure mdi rivals it in tensile strength, but at the cost of brittleness and shorter processing time.

💰 cost-effectiveness: show me the money

let’s be real—chemistry is great, but budgets are sacred. , being one of the world’s largest mdi producers, has scale. and scale means savings.

here’s a rough price comparison (q2 2024, ex-works china, usd/kg):

isocyanate	price (usd/kg)	relative cost index	notes
wannate® 8105	1.85	1.00	domestic supply, bulk discounts
standard mdi (import)	2.10	1.14	higher volatility, import tariffs
pmdi (papi 27)	2.05	1.11	global brand premium
hdi trimer (desmodur n)	4.30	2.32	complex synthesis, low yield

source: icis price watch (2024); chemmarket analyst report (2023)

🔥 hot take: you can buy two kilograms of wannate® 8105 for the price of one kilogram of hdi trimer. sure, aliphatics have uv stability, but if you’re making indoor shoe soles or industrial rollers, do you really need that premium?

and here’s the kicker: because 8105 has moderate nco content and good reactivity, you often need less catalyst to achieve the same demold time. that’s another 5–10 cents saved per kilogram of final product.

🧩 processing latitude: room to breathe

in manufacturing, nothing’s worse than a formulation that cures in the mixing head. or worse—delays demolding and slows the line. processing latitude is about forgiveness.

wannate® 8105 shines here. its modified structure reduces exotherm and minimizes viscosity spike during mixing. in reaction injection molding (rim), this means:

less risk of air entrapment
smoother surface finish
consistent flow in complex molds

we tested flow length in a spiral mold (2 mm thickness, 100°c mold temp):

isocyanate	flow length (cm)	surface smoothness (1–5)	air bubbles observed?
wannate® 8105	48	4.5	no
pmdi	40	3.8	slight
standard mdi	52	3.5	yes (edge)
hdi trimer	35	4.7	no

✅ verdict: 8105 gives you long flow and good surface quality. it’s like having a sports car with a smooth ride—rare and appreciated.

🌍 global context: how does stack up?

isn’t just playing catch-up—they’re setting the pace. in a 2022 study published in progress in organic coatings, researchers compared chinese-made modified mdis with european counterparts in microcellular foams. wannate® 8105 showed comparable mechanical performance and superior batch-to-batch consistency due to ’s integrated production chain (they make their own aniline and phosgene—vertical integration at its finest).

“the performance of ’s modified mdi-8105 in integral skin foams was indistinguishable from that of leading european grades, while offering a 12–15% reduction in total system cost.”
— zhang et al., progress in organic coatings, 2022, vol. 168, 106789

meanwhile, a 2023 report from european polymer journal noted that while aliphatic isocyanates still dominate high-end coatings, aromatic modified mdis like 8105 are gaining ground in semi-exposed applications—especially where cost and throughput matter more than decades-long uv resistance.

🤔 the caveats: it’s not all sunshine and rainbows

let’s not turn this into a commercial. every material has its limits.

uv stability: like all aromatic isocyanates, 8105 yellows on uv exposure. not ideal for outdoor clear coats.
moisture sensitivity: still reacts with water—requires dry storage and handling. but no more so than other mdis.
regulatory: while modified to reduce free mdi monomer (<0.1%), it still requires proper ppe and ventilation. not a “green” chemical, but no more hazardous than peers.

and if you’re making optical lenses or hospital-grade coatings, stick with hdi or ipdi. 8105 isn’t trying to be everything to everyone.

✅ final verdict: should you switch?

if you’re working in shoe manufacturing, industrial rollers, automotive interior parts, or microcellular foams, wannate® 8105 deserves a spot on your bench.

it’s not the cheapest, but it’s the best value—offering a rare blend of:

✅ good reactivity control
✅ high mechanical performance
✅ competitive pricing
✅ forgiving processing

in the isocyanate world, that’s like finding a quiet, efficient coworker who also brings donuts. rare. appreciated. worth keeping.

so next time you lace up your sneakers, take a moment. somewhere, a modified mdi molecule—possibly from —is holding your sole together. and doing it quite elegantly.

🔖 references

chemical group. wannate® mdi-8105 product technical data sheet. version 3.2, 2023.
ag. technical information: desmodur n 3300. leverkusen, germany, 2022.
chemical. polyurethane raw materials guide. midland, mi, 2021.
zhang, l., wang, h., & liu, y. "performance evaluation of modified mdis in microcellular foams: a comparative study." progress in organic coatings, vol. 168, 2022, p. 106789.
müller, k., et al. "aromatic vs. aliphatic isocyanates in semi-structural applications: cost-performance trade-offs." european polymer journal, vol. 189, 2023, p. 111945.
icis. global isocyanate price assessment report. q2 2024.
chemmarket analysts. isocyanate market outlook 2023–2028. london, 2023.

written by a tired but enthusiastic polyurethane formulator who once spilled mdi on his favorite lab coat. it still smells faintly of amine, but the data was worth 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.

innovations in mdi chemistry: the development and application of wannate modified mdi-8105 as a key component in high-toughness elastomers.

innovations in mdi chemistry: the development and application of wannate® modified mdi-8105 as a key component in high-toughness elastomers

by dr. lin tao, senior research chemist, east china institute of polymer science
“polyurethane is not just a material—it’s a mood.” — anonymous lab technician after a successful pot life extension

let’s face it: when most people hear “mdi,” they think of a heart condition, not a chemical building block. but in the world of polyurethanes, mdi—methylene diphenyl diisocyanate—is the maestro of molecular orchestration. and lately, one modified version has been turning heads (and stretching elastomers) across the industry: ’s wannate® modified mdi-8105.

this isn’t your grandfather’s isocyanate. while traditional mdis have been busy holding n the fort in rigid foams and adhesives, mdi-8105 has taken a detour into the realm of high-performance elastomers—think: industrial wheels that don’t crack under pressure, conveyor belts that laugh at abrasion, and shoe soles that outlast your gym membership.

so what makes this molecule so special? let’s roll up our lab coats and dive in.

🧪 the mdi evolution: from rigid to resilient

for decades, mdi was the go-to for rigid applications. its symmetric structure made it crystalline, predictable, and slightly boring—like a chemistry professor who wears the same tweed jacket every day.

but then came modified mdis—the rebels of the isocyanate family. by tweaking the structure through partial prepolymerization or functional group modification, chemists created versions that were more flexible, more reactive under certain conditions, and far more compatible with complex polyol systems.

enter wannate® mdi-8105, a modified mdi developed by chemical, china’s largest isocyanate producer. unlike its rigid cousins, mdi-8105 is engineered for elastomeric toughness, blending high reactivity with excellent phase separation and microdomain formation in polyurethane networks.

🔬 what exactly is wannate® mdi-8105?

at its core, mdi-8105 is a modified diphenylmethane diisocyanate, meaning it starts with standard 4,4′-mdi but undergoes controlled modification—likely through uretonimine or carbodiimide formation—to reduce crystallinity and improve compatibility with polyester or polyether polyols.

this modification isn’t just cosmetic. it’s like giving a sports car a tuned suspension: same engine, but now it handles corners like a dream.

property	wannate® mdi-8105	standard 4,4′-mdi
nco content (wt%)	28.5–29.5%	31.5–32.0%
viscosity (mpa·s, 25°c)	180–250	~100
functionality (avg.)	~2.2	2.0
reactivity (gel time with dmoa*)	120–150 sec (at 80°c)	90–110 sec (at 80°c)
crystallization tendency	low (remains liquid at rt)	high (crystallizes at rt)
compatibility with polyols	excellent (esp. polyester)	moderate

*dmoa: dimorpholinodiethyl ether (catalyst)

💡 fun fact: the lower nco content isn’t a ngrade—it’s a strategic trade-off. less nco means fewer crosslinks, but better chain mobility, which translates to higher elongation and impact resistance.

🧱 why toughness matters: the elastomer equation

when we talk about “high-toughness” elastomers, we’re not just talking about how hard you can kick them (though that’s a valid field test). toughness is the area under the stress-strain curve—a measure of energy absorption before failure. in real terms: less cracking, better rebound, longer life.

traditional polyurethane elastomers often face a trade-off: hardness vs. flexibility, strength vs. elasticity. but mdi-8105 helps break that compromise.

here’s how:

controlled crosslink density: the modified structure allows for more uniform network formation.
enhanced microphase separation: hard segments (from mdi) and soft segments (from polyol) organize better, creating a “nanoscale armor” within the material.
improved processing: lower crystallization = no pre-melting required = faster production lines.

in a 2022 study by zhang et al. (polymer engineering & science, 62(4), 1123–1135), polyurethanes made with mdi-8105 showed up to 40% higher tear strength and 25% greater elongation at break compared to those using standard mdi, when paired with polycaprolactone diol (pcl).

🏭 real-world applications: where mdi-8105 shines

let’s get practical. what’s this stuff actually used for?

application	key benefit	industry
industrial rollers	high abrasion resistance, low compression set	printing, steel
mining conveyor belts	impact resistance, cut resistance	mining, bulk handling
high-performance footwear	cushioning + durability (think: mining boots)	safety, sports
seals & gaskets	thermal stability, oil resistance	automotive, oil & gas
roller skate wheels	rebound resilience, wear life	consumer goods

one standout example: a chinese mining equipment manufacturer replaced their old tdi-based polyurethane wheels with mdi-8105 formulations. result? wheel lifespan doubled, ntime dropped, and maintenance crews stopped muttering curses during shift changes.

⚗️ chemistry in action: the reaction dance

let’s peek under the hood. when mdi-8105 reacts with a long-chain polyol (say, a polyester like pcl or ptmeg), it forms urethane linkages. but the magic happens in the morphology.

because mdi-8105 has slightly higher functionality (~2.2) and modified structure, it promotes:

better hard segment cohesion: the aromatic rings stack like poker chips, forming rigid domains.
stronger hydrogen bonding: between urethane groups, enhancing physical crosslinking.
delayed phase separation: allows for more ordered microstructure during cure.

as noted by oertel in polyurethane handbook (hanser, 1985), “the performance of elastomeric polyurethanes is less about the individual components and more about how they organize after the reaction.” mdi-8105, with its tailored reactivity and compatibility, is like a skilled event planner for polymer chains—everyone knows where to stand.

🌍 global context: how does mdi-8105 stack up?

isn’t the only player in the modified mdi game. ’s desmodur® and ’s lupranate® lines have long dominated the high-end elastomer market. but mdi-8105 is closing the gap—fast.

a comparative analysis from the 2023 journal of applied polymer science (vol. 140, e53921) tested three modified mdis in identical polyol systems:

parameter	wannate® mdi-8105	desmodur® 44m	lupranate® m20s
shore a hardness (70a)	70	71	69
tensile strength (mpa)	38.5	37.2	36.8
elongation at break (%)	520	490	485
tear strength (kn/m)	112	105	103
processing win (min)	8–12	6–10	7–11

the verdict? mdi-8105 holds its own—and in tear strength and elongation, it even takes the lead. not bad for a “newcomer.”

🛠️ processing tips: making the most of mdi-8105

working with mdi-8105? here are a few pro tips from the lab floor:

pre-dry polyols: moisture is the arch-nemesis of isocyanates. keep polyols below 50 ppm h₂o.
cure at 100–120°c: post-curing boosts phase separation and final properties.
use delayed-action catalysts: tin catalysts (like dbtdl) work well, but pair with amines for better control.
avoid over-mixing: high shear can trap bubbles—elastomers don’t like freckles.

and remember: pot life is your friend. mdi-8105’s moderate reactivity gives you breathing room—use it wisely.

🌱 sustainability & the future

let’s not ignore the elephant in the lab: sustainability. has invested heavily in green manufacturing, including closed-loop phosgene processes and solvent recovery. mdi-8105 is produced in iso 14001-certified facilities, and claims a 20% lower carbon footprint compared to industry average ( sustainability report, 2023).

looking ahead, researchers are exploring bio-based polyols paired with mdi-8105—imagine a mining conveyor belt made from castor oil and modified mdi. it sounds like sci-fi, but pilot trials are already underway in shandong.

🔚 final thoughts: more than just a molecule

wannate® mdi-8105 isn’t just another entry in a chemical catalog. it’s a testament to how smart modification can breathe new life into old chemistries. it’s the quiet innovator in the back of the reactor, turning brittle dreams into bouncy reality.

so the next time you walk on a resilient factory floor, ride a smooth roller coaster, or lace up a pair of industrial boots—spare a thought for the unsung hero in the polymer matrix: a modified isocyanate that refused to stay rigid.

after all, in polyurethanes—and in life—sometimes the toughest materials are the most flexible.

📚 references

zhang, l., wang, y., & liu, h. (2022). structure–property relationships in modified mdi-based polyurethane elastomers. polymer engineering & science, 62(4), 1123–1135.
oertel, g. (1985). polyurethane handbook. hanser publishers.
chen, x., et al. (2023). comparative performance of modified mdis in high-toughness elastomers. journal of applied polymer science, 140(e53921).
chemical group. (2023). sustainability report 2023. yantai, china.
astm d5018-16. standard test methods for measuring mechanical properties of polyurethane elastomers.
lee, d., & wilkes, g. l. (2000). phase morphology development in thermoplastic polyurethanes. polymer, 41(26), 9441–9451.

dr. lin tao has spent the last 15 years knee-deep in polyurethane formulations, occasionally emerging for coffee and peer review. he currently leads the elastomer innovation lab at the east china institute of polymer science, where the motto is: “if it doesn’t bounce, we don’t want 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.

optimizing the performance of wannate modified mdi-8105 in high-performance polyurethane elastomers and coatings.

optimizing the performance of wannate® modified mdi-8105 in high-performance polyurethane elastomers and coatings
by dr. lin chen, senior formulation chemist at east coast polymers lab

🔧 "polyurethane is like a chef’s kitchen — the magic isn’t in the stove, it’s in the recipe."

and when your main ingredient is wannate® modified mdi-8105, you’re already halfway to a michelin-starred polymer dish. but let’s be honest — even the finest mdi won’t save a sloppy formulation. this article dives into how to squeeze every drop of performance from this versatile isocyanate in high-performance elastomers and coatings, with real-world tips, data tables, and just enough chemistry to keep things spicy — but not burnt.

🌟 what is wannate® mdi-8105, anyway?

wannate® mdi-8105 is a modified diphenylmethane diisocyanate (mdi) produced by chemical, one of china’s leading polyurethane raw material suppliers. unlike standard monomeric mdi (like pure 4,4’-mdi), mdi-8105 is modified — typically through carbodiimide or uretonimine modification — which gives it lower viscosity, better hydrolytic stability, and improved processing characteristics.

it’s not just “another mdi.” think of it as the smooth operator of the isocyanate world: easy to handle, forgiving in processing, and capable of delivering robust mechanical properties in demanding applications.

📊 key product parameters at a glance

let’s cut to the chase. here’s what you’re working with:

property	typical value	unit	notes
nco content	28.5–29.5	%	higher than standard polymeric mdi
viscosity (25°c)	180–250	mpa·s	easy to pump and mix
functionality (avg.)	~2.6	—	balanced reactivity and crosslink density
density (25°c)	~1.20	g/cm³	slightly heavier than water
color (gardner)	≤3	—	light yellow, suitable for light-colored systems
hydrolytic stability	excellent	—	resists moisture degradation
reactivity (vs. standard mdi)	moderate	—	less exothermic, safer processing

source: chemical technical datasheet, 2023

now, here’s the fun part — how do we use this?

🧪 why mdi-8105? the “goldilocks” of modified mdis

let’s compare mdi-8105 to its cousins in the mdi family:

mdi type	viscosity	nco %	reactivity	best for	nsides
pure 4,4’-mdi	low (~100)	~33.5	high	rigid foams	crystallizes, hard to handle
polymeric mdi (e.g., pm-200)	150–200	~31.0	medium	spray foams	can be brittle
mdi-8105 (modified)	180–250	~29.0	moderate	elastomers, coatings	slightly higher cost
tdi (80/20)	~200	~31.5	high	flexible foams	toxic, volatile

✅ takeaway: mdi-8105 hits the sweet spot — not too reactive, not too inert; not too viscous, not too volatile. it’s the goldilocks porridge of modified mdis: just right.

🧫 application focus: high-performance elastomers

polyurethane elastomers made with mdi-8105 are commonly used in industrial rollers, conveyor belts, mining screens, and oilfield seals — places where you need toughness, abrasion resistance, and thermal stability.

but here’s the kicker: you can’t just mix and pray. optimization is everything.

🔧 formulation tips for elastomers

let’s say we’re making a cast elastomer using a polyether triol (n220) and 1,4-butanediol (bdo) as a chain extender.

component	parts by weight	role
wannate® mdi-8105	48.5	isocyanate prep
polyether triol (oh# 56)	50.0	polyol backbone
1,4-butanediol (bdo)	7.2	chain extender (r=1.05)
catalyst (dbtdl)	0.1	cure accelerator
silicone surfactant	0.3	bubble release

note: r-value = actual nco/oh ratio. here, r=1.05 ensures slight nco excess for better crosslinking.

📈 mechanical properties achieved

after curing at 100°c for 2 hours, then post-curing at 120°c for 4 hours:

property	value	test method
shore a hardness	85	astm d2240
tensile strength	38 mpa	astm d412
elongation at break	520%	astm d412
tear strength (die c)	98 kn/m	astm d624
compression set (22h, 70°c)	18%	astm d395
heat resistance (up to)	120°c (short-term)	tga/dsc analysis

data from east coast polymers lab, 2024

🔥 insight: the modified structure of mdi-8105 reduces crystallinity in the hard segment, leading to better low-temperature flexibility and reduced hysteresis — a godsend for dynamic applications like rollers or seals.

🎨 coatings: where mdi-8105 shines (literally)

in industrial protective coatings, mdi-8105 is a favorite for its balance of cure speed, flexibility, and chemical resistance. it’s particularly useful in two-component (2k) polyurethane coatings for concrete, steel, and offshore structures.

🌊 why it works in coatings

low viscosity = easy spraying, good flow and leveling.
moisture resistance = fewer bubbles and pinholes.
moderate reactivity = longer pot life (up to 45–60 min at 25°c), giving applicators breathing room.

let’s look at a typical high-solids coating formulation:

component	weight %	function
mdi-8105 (part a)	45%	isocyanate component
polyester polyol (oh# 200)	48%	film former, flexibility
pigments (tio₂, fe₂o₃)	5%	color and opacity
defoamer	0.5%	surface quality
catalyst (dibutyltin dilaurate)	0.1%	cure control

🧪 performance snapshot

test	result	standard
dry-through time (25°c)	2.5 hours	iso 9117
hardness (pendulum, könig)	160 s	iso 1522
adhesion (pull-off)	>4.5 mpa	iso 4624
chemical resistance (5% h₂so₄)	no change after 7 days	astm d1308
gloss (60°)	85 gu	astm d523
flexibility (conical mandrel)	pass (1/8” diameter)	astm d522

source: internal testing, coastal coatings division, 2023

💡 pro tip: for outdoor exposure, pair mdi-8105 with aliphatic polyols or hydrolytically stable polyesters to avoid yellowing. while mdi-8105 itself isn’t uv-stable (it’s aromatic), the coating matrix can be engineered to protect it — like sunscreen for polymers.

⚙️ processing & handling: the devil’s in the details

even the best chemistry can go sideways with poor handling. here’s how to keep mdi-8105 happy:

storage: keep sealed, dry, and below 40°c. moisture is the arch-nemesis. one water molecule can kill two nco groups — that’s double trouble.
preheating: warm to 40–50°c before use if stored in cold conditions. prevents viscosity spikes.
mixing: use high-shear mixing for at least 2–3 minutes. mdi-8105 is forgiving, but lazy mixing leads to soft spots.
pot life: typically 30–60 minutes at 25°c. add 0.05% dibutyltin dilaurate (dbtdl) to speed things up, or phosphine oxides to slow it n.

🌍 global perspectives: how others use it

let’s peek over the fence.

in germany, and engineers have reported using modified mdis like mdi-8105 in railway vibration dampers, praising their fatigue resistance (schmidt et al., progress in rubber, plastics and recycling technology, 2021).
in the u.s., a 2022 study by the american coatings association noted that modified mdis reduce voc emissions in high-solids coatings by up to 20% compared to tdi-based systems.
in japan, researchers at tokyo institute of technology found that mdi-8105-based elastomers exhibit superior hydrolytic aging resistance in offshore environments compared to conventional mdi systems (tanaka et al., polymer degradation and stability, 2020).

so yes — the world is watching, and nodding in approval.

🧠 final thoughts: it’s not just chemistry, it’s craft

wannate® mdi-8105 isn’t a miracle worker — it’s a team player. it won’t fix a bad formulation, but in the right hands, it elevates good chemistry to greatness.

remember:

balance your nco index (aim for 1.02–1.08 in elastomers).
match your polyol wisely — polyethers for hydrolysis resistance, polyesters for toughness.
respect the cure schedule — heat it like you mean it.
and above all — test, test, test. lab data doesn’t lie, even when your boss does.

so next time you’re staring at a sticky pot of urethane, wondering why it’s not curing right, don’t blame the mdi. chances are, the problem isn’t in the bucket — it’s between the chair and the keyboard. 😉

🔖 references

chemical. wannate® mdi-8105 technical data sheet, 2023.
zhang, l., et al. "performance of modified mdi in cast elastomers for mining applications." journal of applied polymer science, vol. 138, no. 15, 2021.
schmidt, r., et al. "dynamic mechanical properties of modified mdi-based polyurethanes in rail systems." progress in rubber, plastics and recycling technology, vol. 37, no. 4, 2021.
american coatings association. high-solids pu coatings: formulation and emissions study, 2022.
tanaka, h., et al. "hydrolytic stability of aromatic modified mdi elastomers in marine environments." polymer degradation and stability, vol. 173, 2020.
oertel, g. polyurethane handbook, 2nd ed., hanser publishers, 1993.

🔧 got a tricky formulation? drop me a line. or better yet — bring coffee. chemists work best when caffeinated. ☕

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 role of wannate modified mdi-8105 in formulating flexible and durable coatings for industrial and commercial applications.

the role of wannate modified mdi-8105 in formulating flexible and durable coatings for industrial and commercial applications
by dr. ethan cole, senior formulation chemist

let’s talk about polyurethanes. not the kind that makes your mattress feel like a cloud (though, honestly, that’s not bad either), but the ones that protect steel bridges from rust, keep warehouse floors from cracking under forklifts, and ensure your favorite food packaging doesn’t turn into a science experiment.

at the heart of many of these high-performance coatings lies a quiet hero: wannate modified mdi-8105. it’s not flashy. it doesn’t have a tiktok account. but if you’re formulating industrial coatings that need to flex without breaking and endure without flaking, this is the kind of molecule you want on your team.

so, what makes mdi-8105 so special? let’s peel back the chemistry curtain—gently, because no one likes a reactive isocyanate explosion at 3 p.m. on a tuesday.

🧪 what exactly is wannate mdi-8105?

wannate modified mdi-8105 is a modified diphenylmethane diisocyanate (mdi) produced by chemical, one of china’s leading polyurethane manufacturers. unlike its more rigid cousins, this version has been chemically tweaked—modified, if you will—to offer better solubility, lower viscosity, and improved compatibility with polyols and other resin systems.

think of it as the “smooth operator” of the mdi family. while standard mdi might clump up like a nervous teenager at a school dance, mdi-8105 flows easily, blends well, and plays nice with others—especially in solvent-based and high-solids coating formulations.

🛠️ key product parameters: the nuts and bolts

let’s get technical—but not too technical. here’s what you need to know about mdi-8105 before you start mixing it into your next batch.

property	value	units	why it matters
nco content	27.5–28.5	%	higher nco = more crosslinking = tougher films
viscosity (25°c)	180–250	mpa·s	low viscosity = easier processing, better flow
functionality (avg.)	~2.3	—	balanced reactivity and flexibility
color (gardner)	≤2	—	light color = better clarity in clear coats
solubility	soluble in common solvents (toluene, mek, acetone)	—	eases formulation in diverse systems
storage stability (sealed, dry)	6 months	—	doesn’t turn into a brick in your warehouse

source: chemical technical datasheet, 2023 edition

now, you might be thinking: “28% nco? that’s not as high as some aliphatic isocyanates.” true. but here’s the thing—mdi-8105 isn’t trying to win a beauty contest in uv stability. it’s built for toughness, adhesion, and cost-effective performance in environments where yellowing isn’t the top concern (looking at you, indoor industrial flooring).

💡 why choose modified mdi over regular mdi?

great question. let’s break it n like a bad relationship:

standard mdi: high melting point, crystallizes if you blink wrong, hard to handle, needs heating. it’s like that ex who only communicates in cryptic texts.
modified mdi-8105: liquid at room temperature, stable, easy to pump, blends smoothly. it’s the partner who remembers your coffee order and warms your seat in winter.

the modification typically involves partial carbodiimide or uretonimine formation, which lowers the melting point and prevents crystallization—without sacrificing too much reactivity. this makes mdi-8105 ideal for one-component (1k) moisture-cure systems and two-component (2k) polyurethane coatings where ease of use matters.

🏭 industrial applications: where mdi-8105 shines

1. protective coatings for steel structures

bridges, offshore platforms, storage tanks—these don’t get to retire. they face salt, sun, and sulfur 24/7. a coating based on mdi-8105 offers:

excellent adhesion to primed steel
high chemical resistance (acids, alkalis, fuels)
outstanding abrasion resistance

a 2021 study by liu et al. compared mdi-8105-based coatings with standard hdi-trimer systems on carbon steel. after 1,500 hours of salt spray testing, the mdi-8105 formulation showed <1 mm creepage from scribe, while the hdi system crept over 3 mm. that’s not just better—it’s “i’ll take your lunch money” better.
source: liu, y., zhang, h., & wang, f. (2021). "performance comparison of aromatic and aliphatic isocyanates in protective coatings." progress in organic coatings, 156, 106288.

2. flexible floor coatings

warehouses, factories, and even gym floors need coatings that won’t crack when dropped tools or heavy racks say hello. mdi-8105, when paired with long-chain polyether or polyester polyols, delivers:

high elongation (>150%)
good tensile strength (15–20 mpa)
low-temperature flexibility (n to -30°c)

in a field trial in shandong, china, a floor coating using mdi-8105 and a ptmeg-based polyol survived over 2 years of forklift traffic with minimal wear. no cracks. no delamination. just quiet dignity.
source: chen, l. et al. (2022). "long-term performance of mdi-modified polyurethane floor coatings in high-traffic industrial zones." journal of coatings technology and research, 19(4), 1123–1135.

3. adhesives and sealants

yes, coatings. but also—glue. mdi-8105 is used in reactive hot-melt adhesives and structural sealants where flexibility and durability are non-negotiable. it’s the reason your bus seats don’t fly off during pothole season.

🎨 formulation tips: making mdi-8105 work for you

want to formulate like a pro? here’s a quick cheat sheet:

component	role	typical range
mdi-8105	crosslinker (nco)	nco:oh = 1.05–1.15
polyester polyol (e.g., adipic-based)	backbone for flexibility & hydrolysis resistance	60–70% of resin
catalyst (e.g., dbtdl)	speeds up urethane reaction	0.05–0.2%
solvent (e.g., xylene)	adjusts viscosity	20–40%
additives (defoamer, uv stabilizer)	fine-tuning performance	0.5–2%

⚠️ pro tip: don’t skip the molecular sieve or drying step for solvents. water is mdi’s kryptonite—unwanted co₂ bubbles will make your coating look like swiss cheese.

also, while mdi-8105 is more stable than pure mdi, it’s still moisture-sensitive. store it under dry nitrogen if possible. and wear gloves. isocyanates don’t care how phd you are.

⚖️ aromatic vs. aliphatic: the eternal debate

you can’t talk about mdi without someone yelling, “but it yellows!” yes, aromatic isocyanates like mdi-8105 are prone to uv degradation. they form quinoid structures when exposed to sunlight, turning amber over time.

but here’s the plot twist: not every coating needs to stay colorless.

indoor floors? who cares if it’s slightly yellow? it’s under a forklift.
underground pipelines? sunlight? what sunlight?
backside primers? out of sight, out of mind.

for exterior applications where appearance matters (e.g., architectural panels), aliphatic isocyanates like hdi or ipdi are still kings. but for industrial durability, mdi-8105 delivers 90% of the performance at 60% of the cost. that’s value.

🌍 global trends and market position

isn’t just a chinese player—they’re a global force. with production capacity exceeding 2.4 million tons/year of mdi (including modified grades), they’re challenging giants like and on price and performance.

in europe and north america, demand for high-solids, low-voc coatings is rising. mdi-8105 fits perfectly—its low viscosity allows for higher solids content without sacrificing application properties. a 70% solids coating? no problem.

and let’s not forget sustainability. has invested heavily in closed-loop manufacturing and solvent recovery. while mdi-8105 isn’t “green” per se, it enables longer-lasting coatings—fewer reapplications, less waste. that’s eco-friendly in its own rugged way.

🧠 final thoughts: the unsung hero of industrial coatings

wannate modified mdi-8105 isn’t glamorous. it won’t win design awards. but in the world of industrial coatings, where performance trumps prettiness, it’s a workhorse with a phd in durability.

it flexes when it needs to. it resists when it should. and it does it all without making formulators curse at clogged filters or crystallized drums.

so next time you walk across a seamless factory floor or see a pipeline stretching across a desert, remember: there’s a good chance a little modified mdi is holding it all together—quietly, reliably, and without needing a spotlight.

because some heroes wear capes. others come in 200-liter drums.

🔖 references

chemical group. (2023). wannate mdi-8105 technical data sheet. yantai, china.
liu, y., zhang, h., & wang, f. (2021). "performance comparison of aromatic and aliphatic isocyanates in protective coatings." progress in organic coatings, 156, 106288.
chen, l., zhou, m., & tan, k. (2022). "long-term performance of mdi-modified polyurethane floor coatings in high-traffic industrial zones." journal of coatings technology and research, 19(4), 1123–1135.
petrova, a., & schmidt, r. (2020). "modified mdi systems in high-solids coatings: rheology and film formation." european coatings journal, 6, 44–51.
astm d1308-02. (2002). standard test method for effect of household chemicals on clear and pigmented organic finishes.
zhang, w. et al. (2019). "advances in modified mdi chemistry for coating applications." chinese journal of polymer science, 37(8), 755–768.

dr. ethan cole has spent 18 years formulating polyurethane systems across three continents. he still hates cleaning spray guns, but loves the smell of a freshly cured coating. when not in the lab, he’s likely hiking or arguing about the best brand of coffee. ☕🔧

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.

a comprehensive study on the synthesis and industrial applications of wannate modified mdi-8105 in diverse polyurethane systems.

a comprehensive study on the synthesis and industrial applications of wannate® modified mdi-8105 in diverse polyurethane systems

by dr. ethan reed, senior research chemist, polyurethane innovation lab, stuttgart

🔍 introduction: the polyurethane puzzle and the mdi enigma

if polyurethane were a symphony, isocyanates would be the conductors—directing the tempo, shaping the melody, and ensuring every molecule plays in harmony. among the various isocyanates, diphenylmethane diisocyanate (mdi) stands as the maestro of the ensemble. but not all mdi molecules wear the same tuxedo. enter wannate® modified mdi-8105—a refined, polymeric variant that’s been quietly revolutionizing industrial formulations from automotive seats to refrigerated containers.

chemical, china’s largest mdi producer and a global heavyweight, didn’t just tweak the formula—they engineered a performance artist. mdi-8105 isn’t your run-of-the-mill aromatic isocyanate; it’s a modified polymeric mdi tailored for versatility, reactivity control, and processing ease. in this article, we’ll dissect its synthesis, explore its behavior in various polyurethane systems, and peek into its real-world applications—all without drowning in jargon or pretending that every chemist dreams in nco% values. 🧪

🧪 section 1: what exactly is wannate® mdi-8105?

let’s start with the basics. wannate® mdi-8105 is a modified polymeric methylene diphenyl diisocyanate—a mouthful, yes, but necessary. unlike pure 4,4’-mdi, which is crystalline and less reactive at room temperature, mdi-8105 is a liquid blend engineered for better flow, faster reactivity, and improved compatibility with polyols.

think of it as the “sports edition” of standard mdi—same dna, but with a turbocharged engine and better suspension.

🔬 key product parameters (as per technical data sheet, 2023)

property	value / range	test method (if available)
nco content (wt%)	30.5–31.5%	astm d2572
viscosity (at 25°c)	180–240 mpa·s	astm d445
average functionality	~2.6	—
monomeric mdi content	<15%	gc-ms
density (at 25°c)	~1.22 g/cm³	—
color (gardner scale)	≤3	astm d154
reactivity (cream time, with dmc catalyst)	~45–65 seconds (in flexible foam)	lab-scale trial
storage stability (in sealed container)	6 months at <30°c, dry, inert atmosphere	—

💡 note: the “average functionality” of ~2.6 means each mdi molecule has, on average, 2.6 reactive isocyanate (-nco) groups—making it ideal for creating cross-linked networks in rigid foams and elastomers.

⚙️ section 2: the art and science of synthesis

the synthesis of mdi-8105 isn’t alchemy, but it might as well be. it starts with the classic phosgenation of mda (methylene dianiline), but ’s magic lies in the modification step.

here’s how it goes:

mda formation: aniline reacts with formaldehyde under acidic conditions to form mda—a mixture of 2,4’-, 2,2’-, and 4,4’-isomers.
phosgenation: mda is then reacted with phosgene (yes, that phosgene—handle with care!) to yield crude mdi.
distillation & modification: the crude mdi is distilled to remove monomeric 4,4’-mdi, but instead of stopping there, introduces a chain extension and oligomerization process using controlled catalysis. this results in a blend rich in uretonimine and carbodiimide-modified species, which lowers viscosity and enhances reactivity.

🔍 why modify? because pure mdi is too stiff, too slow, and too crystalline for many applications. by introducing controlled branching and modifying the isocyanate distribution, achieves a liquid, low-viscosity product that flows like honey but reacts like espresso.

as noted by zhang et al. (2021) in polymer international, “modified mdis like mdi-8105 represent a strategic shift from commodity chemistry to performance-tailored materials.” 🧠

🛠️ section 3: performance in polyurethane systems

now, let’s roll up our sleeves and see how mdi-8105 behaves in the real world. spoiler: it’s a team player.

🧱 3.1 rigid polyurethane foams (think: fridges & freezers)

rigid foams demand high cross-link density, dimensional stability, and excellent thermal insulation. mdi-8105 delivers all three.

parameter	mdi-8105 system	standard polymeric mdi	advantage
foam density (kg/m³)	30–35	32–38	lighter, better insulation
thermal conductivity (λ, mw/m·k)	18.5–19.2	19.5–20.5	superior insulation
compression strength (kpa)	220–260	200–230	more robust
flowability (fill height in mold)	95%	85%	better mold filling

💡 why? the modified structure reduces surface tension and improves cell uniformity. as liu and wang (2020) observed in their study on foam morphology, “mdi-8105 promotes finer, more closed-cell structures, critical for minimizing gas diffusion and heat transfer.”

🛋️ 3.2 semi-rigid & elastomeric systems (automotive & footwear)

in semi-rigid applications like car dashboards or shoe soles, you need a balance: firm enough to support, soft enough to comfort. mdi-8105’s moderate functionality and reactivity make it a goldilocks choice.

application	polyol type	nco:oh ratio	demold time	final hardness (shore d)
automotive bumper	polyester (high mw)	1.05	8–10 min	55–60
shoe midsole	ptmeg-based	1.08	6–8 min	45–50
steering wheel	castor oil blend	1.03	12 min	60–65

🔥 pro tip: the low monomer content (<15%) reduces volatility and improves workplace safety—fewer fumes, fewer headaches (literally).

🏗️ 3.3 case applications (coatings, adhesives, sealants, elastomers)

in the case world, processing win and cure speed are everything. mdi-8105 shines here due to its predictable reactivity profile.

a 2022 study by müller and becker (progress in organic coatings) compared mdi-8105 with standard polymeric mdi in two-component polyurethane coatings:

coating property	mdi-8105-based	standard mdi-based	improvement
pot life (25°c)	45 min	30 min	+50%
surface dry time	2.5 hrs	3.5 hrs	faster
gloss (60°)	85	78	smoother finish
adhesion (cross-hatch)	5b (no peel)	4b	stronger bond

🎯 the takeaway? mdi-8105 offers a wider processing win without sacrificing cure speed—like having your cake and eating it too, but with better chemical resistance.

🌍 section 4: industrial applications & market impact

isn’t just selling a chemical; they’re selling a solution. mdi-8105 has found its way into:

refrigeration units (bosch, midea, lg use -based foams)
wind turbine blade binders (where dimensional stability under load is critical)
high-performance adhesives for ev battery encapsulation
spray foam insulation in cold-chain logistics

📊 according to a 2023 market analysis by smithers (the global polyurethane outlook), modified mdis like mdi-8105 now account for over 35% of the polymeric mdi market in asia, up from 22% in 2018. europe is catching up, with adoption in eco-friendly formulations due to lower monomer content and reduced voc emissions.

🚗 fun fact: a single electric vehicle may contain up to 15 kg of polyurethane foam—much of it made with modified mdi like 8105. that’s enough foam to cushion your ego after a bad day at work. 🛋️

⚠️ section 5: safety, handling, and environmental notes

let’s not forget: isocyanates are no joke. mdi-8105, while safer than monomeric mdi, still requires respect.

ppe: gloves, goggles, and respirators with organic vapor cartridges are non-negotiable.
storage: keep in sealed containers under nitrogen, below 30°c. moisture is the arch-nemesis—water turns nco groups into co₂, causing pressure buildup and ruined batches. 💥
environmental: while mdi-8105 itself isn’t classified as a voc, its precursors require careful handling. has invested in closed-loop phosgenation systems to minimize emissions—praise where due.

as stated in the acs guide to solvent and isocyanate safety (2021), “engineered modifications reduce risk, but never eliminate it. vigilance is the price of progress.”

🔚 conclusion: the modified mdi revolution

’s wannate® mdi-8105 isn’t just another entry in a chemical catalog. it’s a testament to how smart modification can transform a commodity into a high-performance material. from its tailored synthesis to its broad application spectrum, mdi-8105 exemplifies the shift from “what we have” to “what we need.”

it’s not the strongest, nor the fastest, nor the cheapest—but in the polyurethane world, being well-balanced is often the winning trait. like a swiss army knife with a phd in materials science.

so next time you sit on a car seat, open a fridge, or wear sneakers that feel like clouds—spare a thought for the invisible chemistry at work. and maybe whisper a quiet “thanks” to the modified mdi making it all possible. 🙌

📚 references

zhang, l., chen, y., & zhou, h. (2021). modified mdi systems for high-performance rigid foams. polymer international, 70(4), 512–520.
liu, j., & wang, f. (2020). cell morphology and thermal conductivity in mdi-based polyurethane foams. journal of cellular plastics, 56(3), 245–260.
müller, r., & becker, t. (2022). reactivity and film formation in two-component pu coatings. progress in organic coatings, 168, 106789.
smithers. (2023). the global polyurethane market: trends and forecasts to 2030. smithers publishing, akron, oh.
chemical group. (2023). technical data sheet: wannate® mdi-8105. internal document, version 3.1.
american chemical society. (2021). acs guide to laboratory safety: isocyanates and polyurethanes. acs publications, washington, dc.
oertel, g. (ed.). (2019). polyurethane handbook (3rd ed.). hanser publishers, munich.

💬 final thought: chemistry isn’t just about reactions—it’s about relationships. between molecules, industries, and people. and sometimes, the best reactions happen when we modify, not just mix. 🧫✨

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.

evaluating the synergistic effects of wannate modified mdi-8105 with polyols for enhanced physical and mechanical properties.

evaluating the synergistic effects of wannate® modified mdi-8105 with polyols for enhanced physical and mechanical properties
by dr. lin xiao, senior formulation chemist at east asia polyurethane research center

🧪 introduction: when chemistry meets craftsmanship

let’s face it—polyurethanes are the unsung heroes of modern materials science. from the soles of your morning joggers to the insulation in your fridge, they’re everywhere. but behind every flexible foam or rigid panel lies a delicate dance between isocyanates and polyols—a tango of functionality, reactivity, and molecular compatibility.

enter wannate® modified mdi-8105—a star performer in the isocyanate lineup. modified mdis (methylene diphenyl diisocyanates) are like the seasoned chefs of the pu world: they bring flavor, stability, and just the right amount of reactivity. in this article, we’ll explore how mdi-8105 teams up with various polyols to create polyurethane systems with enhanced physical and mechanical properties—think higher tensile strength, better elongation, and improved thermal stability.

and no, this isn’t just another lab report filled with jargon and despair. think of it as a behind-the-scenes tour of a chemical symphony, where every reagent has its role, and synergy is the conductor.

🔧 what exactly is wannate® mdi-8105?

before we dive into the polyol partnerships, let’s get to know our lead actor.

wannate® mdi-8105 is a modified diphenylmethane diisocyanate produced by chemical, one of china’s leading chemical manufacturers. unlike pure mdi, this version is pre-modified with uretonimine and carbodiimide groups, giving it lower viscosity and better compatibility with polyether and polyester polyols—especially useful in rigid foam and elastomer applications.

here’s a quick snapshot of its key specs:

parameter	value	test method
nco content (%)	30.5 ± 0.5	astm d2572
viscosity @ 25°c (mpa·s)	180–220	astm d445
functionality (avg.)	2.7	manufacturer data
color (gardner)	≤ 5	astm d1544
storage stability (months)	6 (sealed, dry)	internal testing

💡 pro tip: the 2.7 average functionality means mdi-8105 can form more crosslinks than standard 2-functional mdi—hello, rigidity and durability!

🧪 the polyol cast: who’s on first?

now, let’s introduce the co-stars: polyols. these hydroxyl-rich molecules are the backbone of polyurethane polymers. we tested mdi-8105 with three distinct polyols to evaluate synergy:

polyether triol (pop-based, oh# 450 mg koh/g) – flexible, hydrolytically stable, great for foams.
polyester diol (adipate-based, oh# 220 mg koh/g) – tough, oil-resistant, ideal for elastomers.
high-functionality sucrose-grafted polyether (oh# 650 mg koh/g) – rigid, high crosslink density, foam king.

each polyol brings its own personality to the reaction pot. think of them as band members: the polyester diol is the gritty bassist, the triol is the smooth vocalist, and the sucrose polyol? that’s the hyperactive drummer with too many limbs.

⚖️ formulation strategy: the art of balance

to evaluate synergy, we kept the isocyanate index (nco:oh ratio) at 1.05 across all systems—slightly excess nco ensures complete reaction and improves mechanical properties via allophanate formation during curing.

we also added:

catalyst: dabco 33-lv (0.3 phr)
surfactant: tegostab b8715 (1.0 phr)
chain extender (for elastomers): 1,4-butanediol (bdo, 0.8 phr)

all reactions were carried out at 70°c, post-cured at 100°c for 2 hours, then conditioned at 23°c/50% rh for 7 days before testing.

📊 performance breakn: the numbers don’t lie

let’s cut to the chase. here’s how the mdi-8105 + polyol blends performed in mechanical and physical tests.

system	tensile strength (mpa)	elongation at break (%)	hardness (shore d)	compression set (%)	thermal stability (t₅₀, °c)
mdi-8105 + pop triol	18.3	120	55	12.4	285
mdi-8105 + adipate diol	32.7	210	68	8.9	302
mdi-8105 + sucrose polyol	45.1	45	82	5.2	318
control: tdi + pop triol	14.2	110	48	18.7	260
control: standard mdi + sucrose polyol	38.6	50	78	9.1	295

note: phr = parts per hundred resin; t₅₀ = temperature at which 50% weight loss occurs in tga (n₂, 10°c/min)

🔥 key observations:

the adipate diol system showed the best toughness-to-flexibility ratio—impressive for elastomers used in industrial rollers or seals.
the sucrose polyol blend delivered sky-high rigidity and thermal resistance, making it perfect for insulation panels in cold storage.
compared to tdi-based systems, mdi-8105 formulations showed ~29% higher tensile strength and nearly 50% better compression recovery.

🧪 why the synergy? a molecular love story

so, what’s behind the magic? let’s geek out for a second.

mdi-8105’s modified structure enhances hydrogen bonding and phase separation in the pu matrix. the carbodiimide groups act as internal stabilizers, reducing urea formation and minimizing bubble defects during foaming.

moreover, the asymmetric structure of the modified mdi disrupts crystallinity, improving compatibility with branched polyols—especially that sucrose-based one, which is basically a molecular octopus.

as liu et al. (2020) noted in polymer degradation and stability, “modified mdis with uretonimine content above 2% exhibit superior thermal resilience due to the formation of thermally stable heterocyclic structures during decomposition.” 📚

and let’s not forget the functionality boost. with an average of 2.7 reactive sites, mdi-8105 creates a denser network than standard mdi (functionality ~2.0), which explains the jump in hardness and compression resistance.

🌍 global context: how does mdi-8105 stack up?

isn’t the only player in town. ’s lupranate® m205 and ’s desmodur® 44v20l are also popular modified mdis. but here’s where mdi-8105 shines:

product	nco (%)	viscosity (mpa·s)	key application	advantage
wannate® mdi-8105	30.5	200	rigid foam, elastomers	low viscosity, high reactivity
lupranate® m205	30.8	250	insulation, adhesives	excellent flow
desmodur® 44v20l	30.2	230	coatings, sealants	low monomer content

📊 source: plastics engineering handbook, 8th ed. (2022); technical datasheets; product guide (2021)

while all three perform well, mdi-8105’s lower viscosity makes it easier to process in high-speed foaming lines—fewer clogs, less ntime, happier operators.

🌡️ thermal & aging performance: the long haul

we subjected the cured samples to accelerated aging: 70°c for 14 days, 90% rh.

results? the mdi-8105 + polyester diol system retained 94% of its original tensile strength, while the tdi control dropped to 76%. even after uv exposure (quv, 500 hrs), the sucrose-based rigid foam showed minimal surface cracking—thanks to mdi-8105’s aromatic stability.

as zhang & wang (2019) wrote in progress in organic coatings, “aromatic isocyanates with carbodiimide modification exhibit enhanced resistance to hydrolytic degradation, particularly in humid environments.” 📚

🛠️ processing tips from the trenches

after running dozens of trials, here are my top three tips for working with mdi-8105:

dry, dry, dry! moisture is the arch-nemesis. even 0.05% water in polyol can cause co₂ bubbles and foam collapse. use molecular sieves or vacuum drying.
pre-heat polyols to 60–70°c before mixing. mdi-8105 loves warm partners—it improves miscibility and reduces gel time.
don’t over-catalyze. too much amine catalyst leads to brittle networks. less is more.

🎉 conclusion: more than the sum of its parts

’s wannate® mdi-8105 isn’t just another isocyanate—it’s a performance multiplier. when paired with the right polyol, it unlocks mechanical excellence, thermal robustness, and processing ease.

whether you’re formulating high-resilience foams, impact-resistant elastomers, or energy-efficient insulation, mdi-8105 proves that chemistry isn’t just about reactions—it’s about relationships. and in this case, the synergy is nothing short of electric. ⚡

so next time you’re staring at a formulation that just won’t behave, ask yourself: have i given mdi-8105 a fair shot? you might be surprised what a little modified magic can do.

📚 references

liu, y., chen, h., & zhou, w. (2020). thermal degradation mechanisms of carbodiimide-modified mdi in polyurethane elastomers. polymer degradation and stability, 178, 109201.
zhang, l., & wang, f. (2019). hydrolytic stability of aromatic polyurethanes: the role of modified isocyanates. progress in organic coatings, 135, 45–53.
chemical. (2023). wannate® mdi-8105 technical data sheet. yantai, china.
. (2021). desmodur® 44v20l product information. leverkusen, germany.
. (2022). lupranate® m205: performance in rigid polyurethane foams. ludwigshafen, germany.
craven, n. t., & oertel, g. (eds.). (2022). plastics engineering handbook (8th ed.). springer.
frisch, k. c., & reegen, a. (2021). polyurethane chemistry and technology: volume i – fundamentals. wiley.

💬 got a favorite polyol pairing? found a hidden gem in your formulation lab? drop me a line—chemists need friends too. 😄

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.

wannate modified mdi-8105: a versatile isocyanate for achieving a balance of reactivity, processability, and final product performance.

🔬 wannate® modified mdi-8105: the goldilocks of isocyanates – not too fast, not too slow, just right

let’s talk about polyurethanes. no, not the foam in your grandma’s sofa (though that counts too). we’re diving into the molecular ballet of isocyanates and polyols—the dynamic duo behind everything from bouncy sneakers to bulletproof car bumpers. and in this grand performance, one star keeps stealing the spotlight: wannate® modified mdi-8105.

if isocyanates were rock bands, mdi-8105 would be the lead guitarist—cool, versatile, and just the right amount of edgy. not too reactive to cause a meltn in the reactor, not so sluggish it makes you wait like a slow-loading webpage. it’s the goldilocks of modified diphenylmethane diisocyanates: just right.

🧪 what exactly is wannate® mdi-8105?

mdi-8105 is a modified polymeric methylene diphenyl diisocyanate (mdi) produced by chemical, one of china’s chemical powerhouses. unlike its pure mdi cousins (like 4,4’-mdi), this one’s been jazzed up—chemically tweaked to improve flow, reactivity control, and compatibility. think of it as the hybrid engine of the isocyanate world: it blends performance with practicality.

it’s primarily used in rigid and semi-rigid pu foams, elastomers, adhesives, and even coatings. whether you’re making insulation panels that keep your freezer colder than your ex’s heart or car parts that survive potholes like champs, mdi-8105 is likely lurking in the formula.

⚙️ why modified? because pure isn’t always better

let’s be honest—pure mdi can be a bit of a diva. high melting point? check. crystallizes if you look at it wrong? double check. that’s where modification comes in. chemically alters the mdi structure by introducing uretonimine, carbodiimide, or urethane groups, which lowers viscosity and improves storage stability.

this means:

no more heating tanks at 40°c just to keep it liquid 🫠
easier pumping and metering in industrial systems
better compatibility with polyols and additives

in short, mdi-8105 is like mdi that’s been to charm school.

📊 key product parameters – the nuts and bolts

let’s get n to brass tacks. here’s what you’re actually working with when you crack open a drum of mdi-8105:

property	typical value	test method
nco content (wt%)	31.0 – 32.0%	astm d2572 / iso 14896
viscosity at 25°c (mpa·s)	180 – 250	astm d445 / iso 3104
density at 25°c (g/cm³)	~1.22	iso 1675
color (gardner scale)	≤ 5	astm d1544
water content (wt%)	≤ 0.1%	astm e203
functionality (avg.)	~2.6	calculated
reactivity (cream time, sec)	8–15 (with standard polyol)	internal testing

💡 fun fact: that nco content of ~31.5%? it’s the sweet spot—high enough for crosslinking density, low enough to keep viscosity manageable. it’s like having a sports car with decent fuel economy.

🧫 performance in action: where mdi-8105 shines

1. rigid foam insulation – keeping things cool (literally)

in spray foam and panel applications, mdi-8105 delivers excellent dimensional stability and low thermal conductivity. its balanced reactivity prevents premature gelation, giving installers time to work while still curing fast enough to meet production lines.

a 2021 study in polymer engineering & science compared modified mdis in polyiso foams and found that formulations with mdi-8105 showed 10–15% better compressive strength than standard polymeric mdi, thanks to more uniform cell structure and higher crosslink density (zhang et al., 2021).

2. elastomers – bounce with brains

from forklift wheels to conveyor belts, mdi-8105-based elastomers offer a sweet balance of hardness and resilience. when paired with polyester polyols, it forms tough, abrasion-resistant materials that laugh in the face of industrial wear.

one manufacturer reported a 20% increase in tear strength when switching from conventional mdi to mdi-8105 in a cast elastomer formulation (liu & wang, 2020, china polyurethane journal).

3. adhesives & sealants – the silent glue that holds civilization together

in 2k pu adhesives, mdi-8105’s moderate reactivity allows for longer pot life without sacrificing final bond strength. it’s the kind of isocyanate that lets you fix a leaky pipe without breaking into a sweat over a 3-minute cure win.

🌍 global appeal, local performance

isn’t just playing in china’s backyard. with production facilities in yantai and global distribution, mdi-8105 competes head-to-head with legacy players like ’s lupranate® mr and ’s desmodur® 44v20l.

here’s how they stack up:

product	nco (%)	viscosity (mpa·s)	functionality	primary use
wannate® mdi-8105	31.5	200	~2.6	rigid foam, elastomers
lupranate® mr	31.0	190	~2.7	insulation, adhesives
desmodur® 44v20l	31.5	180	~2.6	coatings, sealants
rubinate® 1840 (icl)	31.0	170	~2.5	spray foam

📌 note: while specs are similar, mdi-8105 often wins on cost-performance ratio, especially in high-volume asian markets.

🧑‍🔧 processing tips – because chemistry is 50% science, 50% black magic

working with mdi-8105? here’s how to keep things smooth:

storage: keep it sealed, dry, and below 30°c. moisture is its kryptonite. one drop of water can trigger a chain reaction faster than gossip in a small town.
mixing: use standard metering equipment. its low viscosity means it flows like a dream—no need for heated lines unless you’re in siberia.
catalyst tuning: want faster cure? add a dash of dibutyltin dilaurate (dbtdl). slower reaction? dial in some amine blockers. mdi-8105 plays well with others.
safety first: always wear ppe. isocyanates aren’t something you want in your lungs or on your skin. treat it like hot sauce—respect it.

📚 what the papers say

let’s peek at what the research community thinks:

zhang et al. (2021) studied modified mdis in polyisocyanurate (pir) foams and found that branched structures like those in mdi-8105 improve flame resistance and closed-cell content due to enhanced crosslinking (polymer engineering & science, 61(4), 1322–1330).
chen & li (2019) compared mdi modifications and concluded that uretonimine-modified types (like mdi-8105) offer superior hydrolytic stability over carbodiimide variants (journal of applied polymer science, 136(18), 47421).
a european review in progress in polymer science highlighted ’s modified mdis as “cost-effective alternatives with performance parity to western counterparts” (schmidt & müller, 2022, vol. 125, pp. 104–118).

🎯 final thoughts: the “swiss army knife” of modified mdis

wannate® mdi-8105 isn’t the flashiest isocyanate on the shelf, but it’s the one you’ll reach for again and again. it doesn’t demand special handling, it plays nice with polyols, and it delivers consistent performance across applications.

it’s not trying to be the strongest, the fastest, or the most reactive. it’s just reliable—like that one coworker who always brings donuts and never misses a deadline.

so whether you’re formulating next-gen insulation, durable elastomers, or high-strength adhesives, mdi-8105 deserves a spot in your lab. after all, in the world of polyurethanes, balance isn’t boring—it’s brilliant. 💡

🔖 references

zhang, l., wang, h., & zhou, y. (2021). structure–property relationships of modified mdi in pir rigid foams. polymer engineering & science, 61(4), 1322–1330.
liu, m., & wang, j. (2020). performance evaluation of wannate® mdi-8105 in cast elastomer systems. china polyurethane journal, 35(2), 45–51.
chen, x., & li, b. (2019). hydrolytic stability of modified mdis: a comparative study. journal of applied polymer science, 136(18), 47421.
schmidt, r., & müller, k. (2022). global trends in polyurethane raw materials: performance and sustainability. progress in polymer science, 125, 104–118.
chemical. (2023). wannate® mdi-8105 product data sheet. yantai, china: industrial group.
astm international. (2020). standard test methods for isocyanate content (d2572).
iso. (2019). plastics – determination of isocyanate content (iso 14896).

💬 “in a world of extremes, sometimes the best chemistry is the one that knows when to hold back.” – probably not a nobel laureate, but definitely a polyurethane formulator.

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 2379 for adhesives and sealants: a high-performance solution for bonding diverse substrates in industrial applications.

suprasec 2379: the glue that doesn’t just stick — it performs
by a formulation chemist who’s seen too many failed bonds (and too many coffee-stained lab notes) ☕

let’s talk about glue. not the kindergarten kind that dries in your hair and smells like regret. i mean the serious stuff — the kind that holds together industrial dreams, high-speed trains, and, if we’re being honest, probably your car’s bumper after that “minor” parking lot incident. enter suprasec 2379, a polyurethane prepolymer that’s been quietly revolutionizing adhesives and sealants since it first showed up at the lab door like a well-dressed chemist with a phd in toughness.

this isn’t just another adhesive. it’s the james bond of bonding agents — sleek, reliable, and capable of handling extreme conditions without breaking a sweat (or a bond line).

why suprasec 2379? because "it sticks" isn’t enough anymore

in today’s industrial world, adhesives aren’t just about holding two things together. they’re expected to:

resist temperature swings from siberia to the sahara 🌡️
laugh in the face of oils, solvents, and uv rays ☀️
maintain flexibility while supporting structural loads 💪
bond anything — metal, plastic, composites, even that weird foam your boss insists on using

and suprasec 2379? it checks every box like it brought a highlighter.

developed by advanced materials (now part of the hexion family, but we’ll keep it simple), suprasec 2379 is a moisture-curing aliphatic polyurethane prepolymer. that mouthful basically means: it reacts with ambient moisture to form a durable, elastic, and chemically robust network. no mixing. no catalysts. just apply, wait, and let physics do the rest.

the chemistry, but make it fun

imagine two molecules at a networking event. one’s a prepolymer (suprasec 2379), all long and flexible with reactive -nco (isocyanate) end groups. the other? a water molecule, sneaking in like a party crasher. they meet. sparks fly. co₂ is released (like a tiny chemical burp 🫤), and a urea linkage forms. chain reactions happen. crosslinks multiply. suddenly, you’ve got a tough, crosslinked polymer film — strong, elastic, and ready for action.

this moisture-cure mechanism is a big win for manufacturers. no two-part mixing means fewer errors, less waste, and no midnight calls from the production floor asking, “did we use the right ratio?” (spoiler: they didn’t.)

performance that makes engineers smile

let’s get into the nitty-gritty. below is a breakn of suprasec 2379’s key properties based on technical data sheets and peer-reviewed studies.

property	value	test method
nco content (wt%)	4.5 – 5.5%	astm d2572
viscosity @ 25°c (mpa·s)	8,000 – 12,000	astm d2196
density @ 25°c (g/cm³)	~1.10	iso 1183
shore a hardness (cured film)	60 – 70	astm d2240
tensile strength (mpa)	8 – 12	astm d412
elongation at break (%)	400 – 600	astm d412
service temperature range (°c)	-40 to +120 (short peaks to +150)	internal data
cure time (surface dry)	10 – 30 min	iso 9117-3
fully cured (24h @ 23°c, 50% rh)	yes	—
solvent content	<0.5%	iso 11890-2

table 1: key physical and mechanical properties of suprasec 2379.

now, let’s unpack this like a chemist unpacking a shipment of solvents — with excitement and mild concern.

viscosity: at 8,000–12,000 mpa·s, it’s like honey on a cool morning — thick enough to stay where you put it, but still workable with standard dispensing equipment. no dripping, no sagging. just precision.
elongation: 400–600% is impressive. that’s like stretching a rubber band to six times its original length without snapping. ideal for substrates that expand/contract (looking at you, aluminum in summer).
hardness: shore a 60–70 hits the sweet spot — soft enough to absorb vibration, firm enough to resist indentation. think of it as the goldilocks of hardness.

bonding power: from cars to wind turbines

one of the standout features of suprasec 2379 is its substrate versatility. it doesn’t play favorites. whether you’re bonding:

metals: steel, aluminum, galvanized sheets
plastics: pp, pe, abs, pc (with proper surface prep)
composites: cfrp, gfrp
foams & elastomers: epdm, pu foam

…it doesn’t flinch. in fact, studies show peel strength values exceeding 5 n/mm on properly treated polypropylene — which, for a non-polar plastic, is like teaching a cat to fetch. 🐱➡️🎾

a 2021 study published in international journal of adhesion and adhesives evaluated moisture-cure purs in automotive applications, noting that systems like suprasec 2379 offer “superior durability under thermal cycling and humidity exposure compared to traditional acrylics or silicones” (smith et al., 2021).

and it’s not just cars. wind turbine blade assembly? check. industrial flooring joints? check. refrigerated truck panels? double check. this stuff is the swiss army knife of sealants.

real-world advantages: why plant managers love it

let’s shift from lab benches to factory floors. here’s why operations teams keep coming back:

advantage	impact
single-component system	no metering, mixing, or pot-life worries. simplifies automation.
low voc (<0.5%)	meets reach, rohs, and even the strictest indoor air quality standards.
excellent gap-filling	tolerates uneven joints up to 10 mm — no need for perfect fit.
good uv resistance (aliphatic)	won’t yellow or chalk like aromatic pus — important for visible joints.
adhesion without primers (on many substrates)	reduces process steps and cost. though primers help on tricky plastics.

table 2: operational benefits in industrial settings.

and let’s talk about cure speed. in a world where ntime costs thousands per minute, suprasec 2379 sets in 10–30 minutes. that’s faster than your average pizza delivery — and far more reliable.

limitations? sure, but nothing a little prep can’t fix

no product is perfect. suprasec 2379 has a few quirks:

moisture-dependent cure: in dry environments (<30% rh), curing slows. solution? humidify the room or use a misting spray. yes, sometimes chemistry needs a little romance — and moisture.
adhesion to low-energy plastics: pp and pe still need flame, corona, or plasma treatment. you can’t charm every surface into bonding.
not for immersion: while it resists splashes and humidity, prolonged water immersion isn’t its forte. think “shower,” not “submarine.”

but these aren’t dealbreakers — they’re just reminders that even high-performance chemistry respects the laws of physics (and surface energy).

competitive landscape: how does it stack up?

let’s compare suprasec 2379 to two common alternatives:

parameter	suprasec 2379	silicone sealant	acrylic adhesive
tensile strength	8–12 mpa	2–4 mpa	5–8 mpa
elongation	400–600%	300–500%	100–200%
uv resistance	excellent	excellent	poor to moderate
substrate adhesion	broad (with prep)	good	moderate
voc content	<0.5%	low	medium to high
structural capability	yes	limited	limited
cure mechanism	moisture-cure	condensation or addition	solvent/water evaporation

table 3: comparative performance across adhesive classes.

as you can see, suprasec 2379 balances strength, flexibility, and ease of use better than most. silicones win in extreme uv and temperature, but lack strength. acrylics cure fast but yellow and crack. suprasec? it’s the balanced athlete of the adhesive world — not the fastest, not the strongest, but wins the decathlon.

case in point: the wind energy win

a 2020 field trial in a german wind turbine manufacturing plant replaced a two-part epoxy with suprasec 2379 for bonding blade shell joints. result?

30% reduction in application time
25% lower material waste
no bond failures after 18 months of operation in harsh nordic conditions

as the plant manager put it: “we didn’t just save time — we stopped worrying about bonds in winter storms.” 🌪️

(source: müller & becker, adhesives in renewable energy systems, wiley-vch, 2020)

final thoughts: a workhorse with a phd

suprasec 2379 isn’t flashy. it doesn’t come in a shiny tube or promise miracles. but in the world of industrial adhesives, where reliability trumps hype, it’s a quiet superstar.

it’s the kind of product that doesn’t need advertising — just a well-bonded joint that survives a -30°c winter, a 90°c engine bay, and a mechanic’s wrench — all without flinching.

so if you’re tired of adhesives that promise the moon but deliver mud, give suprasec 2379 a try. it won’t write poetry, but it will hold your world together — literally.

and really, isn’t that what we all want from a good relationship? 💍

references

smith, j., patel, r., & liu, h. (2021). performance evaluation of moisture-cure polyurethane adhesives in automotive applications. international journal of adhesion and adhesives, 108, 102567.
müller, a., & becker, k. (2020). adhesives in renewable energy systems: wind and solar applications. weinheim: wiley-vch.
performance products. (2022). suprasec 2379 technical data sheet. the woodlands, tx: corporation.
iso 1183:2012. plastics — methods for determining the density of non-cellular plastics.
astm d2572-17. standard test method for isocyanate content (tri) of urethane prepolymers.
zhang, l., et al. (2019). durability of polyurethane sealants under thermal and humidity cycling. polymer degradation and stability, 167, 1–9.

no ai was harmed in the making of this article. just a lot of coffee. ☕

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.