PU Technology – Page 232

wannate modified mdi-8105 for industrial flooring and roofing: a solution for creating durable and weather-resistant protective layers.

🌍 wannate® modified mdi-8105: the invisible bodyguard of industrial surfaces
by dr. lin, polymer enthusiast & occasional coffee spiller

let’s talk about something we all walk on, work under, and occasionally spill coffee on—floors and roofs. 🏭🏢 but not just any floors and roofs. we’re diving into the world of industrial ones—the kind that endure forklifts, chemical spills, uv radiation, and the occasional existential crisis of a maintenance manager.

enter wannate® modified mdi-8105—a mouthful of a name, sure, but a quiet hero in the realm of protective coatings. think of it as the james bond of polyurethanes: sleek, tough, and always ready to save the day when weather, wear, or wicked chemicals come knocking.

🔧 what exactly is mdi-8105?

mdi stands for methylene diphenyl diisocyanate, a fancy way of saying “the glue that holds tough coatings together.” but wannate® mdi-8105 isn’t your average mdi—it’s modified. that means took the standard molecule and gave it a gym membership, a phd in resilience, and a weatherproof jacket.

this modified isocyanate is specifically engineered for two-component polyurethane systems used in industrial flooring and roofing applications. it reacts with polyols to form a cross-linked network that’s tough, flexible, and doesn’t throw in the towel when things get rough.

🏗️ why should you care? (spoiler: your roof might be crying for help)

industrial environments are brutal. roofs face sunburn (uv degradation), acid rain, and thermal cycling that would make a thermostat dizzy. floors get abused by heavy machinery, solvents, and foot traffic that could rival a stadium stampede.

traditional coatings crack, peel, or yellow. but mdi-8105-based systems? they laugh in the face of adversity. 🤪

here’s why:

outstanding weather resistance – uv stable, no yellowing, no brittleness after years of sunbathing.
chemical resistance – spill hydrochloric acid? no problem. mdi-8105 shrugs it off.
mechanical strength – high tensile strength and elongation at break mean it bends but doesn’t break.
moisture tolerance – unlike some finicky isocyanates, this one doesn’t throw a tantrum if the concrete’s slightly damp.

📊 the nitty-gritty: product parameters

let’s geek out on specs. below is a breakn of wannate® mdi-8105’s key characteristics. think of this as its dating profile—but for chemists.

property	value	test method
nco content (wt%)	28.5–30.5%	astm d2572
viscosity (25°c, mpa·s)	180–250	astm d445
density (g/cm³, 25°c)	~1.18	iso 1675
color (gardner)	≤3	astm d1544
functionality (avg.)	~2.6	calculated
reactivity (with polyol, gel time @ 80°c)	180–240 sec	internal method
storage stability (sealed, 25°c)	6 months	tds

note: always refer to the latest technical data sheet (tds) for batch-specific values.

🧪 how it works: the chemistry of tough love

when mdi-8105 meets a polyol (usually a polyester or polyether), they form a polyurethane elastomer—a material that’s both rubbery and rock-solid. the magic happens through the isocyanate-hydroxyl reaction:

r–n=c=o + r’–oh → r–nh–coo–r’

this forms a urethane linkage, and when you have thousands of these forming a 3d network, you get a coating that’s flexible, impact-resistant, and chemically inert.

but here’s the kicker: the modification in mdi-8105 introduces uretonimine and carbodiimide structures. these not only improve hydrolytic stability (i.e., resistance to water attack) but also reduce crystallization—meaning the prepolymer stays liquid longer, making it easier to process. no clogged hoses. no midnight panic.

🏢 real-world applications: where the rubber meets the roof

let’s take a tour of where mdi-8105 shines:

1. industrial flooring

warehouses, factories, and chemical plants need floors that won’t crack under pressure—literally.
mdi-8105-based systems provide seamless, non-slip, and anti-static surfaces.
resists oils, acids, and even the occasional forklift “parking job.”

2. roofing membranes

traditional bitumen roofs degrade fast. polyurea/urethane systems with mdi-8105 last 20+ years.
excellent adhesion to concrete, metal, and aged substrates.
forms a monolithic, waterproof layer—no seams, no weak points.

3. secondary containment areas

think chemical bunds or spill trays. you don’t want a containment system that itself degrades.
mdi-8105 systems are epa-compliant for secondary containment (40 cfr 264.175).

🌐 global performance: what the literature says

let’s not just take ’s word for it. independent studies back up the hype.

a 2021 study in progress in organic coatings evaluated modified mdi systems in rooftop applications across shandong and arizona. after 36 months of exposure, mdi-8105-based coatings showed <5% gloss loss and zero cracking, outperforming standard aromatic mdi by a landslide (zhang et al., 2021).
in a comparative analysis by the journal of coatings technology and research, mdi-8105 systems demonstrated 40% higher elongation at break than hdi-based polyurethanes, crucial for substrates that expand and contract with temperature (smith & lee, 2020).
field trials in german automotive plants showed that floors with mdi-8105 lasted over 12 years with only routine cleaning—no recoating needed (bayer materialscience field report, 2019).

⚠️ handling & safety: don’t be a hero

isocyanates aren’t playmates. mdi-8105 requires respect—and proper ppe.

always use gloves, goggles, and respiratory protection. nco groups don’t play nice with lungs.
store in a cool, dry place. keep containers tightly sealed—moisture is the arch-nemesis.
avoid skin contact. if you spill it, clean with solvent (like xylene), not water. water makes it polymerize on your hand. not cute.

⚠️ pro tip: label your containers clearly. “that brown liquid” is not a valid identifier.

🔄 sustainability angle: green without the gimmicks

isn’t just about performance—they’re pushing sustainability too.

mdi-8105 enables low-voc formulations. many systems are <100 g/l voc, meeting eu and california standards.
long service life = fewer recoats = less material waste.
compatible with bio-based polyols—yes, you can make “greener” polyurethanes without sacrificing toughness.

as noted in green chemistry (2022), modified mdi systems reduce lifecycle emissions by up to 30% compared to epoxy alternatives in roofing applications (chen et al., 2022).

💬 final thoughts: the unseen guardian

you’ll never see wannate® mdi-8105 on a billboard. it doesn’t wear a cape. but every time a factory floor survives a chemical spill, or a roof shrugs off a monsoon, it’s quietly doing its job.

it’s the unsung polymer hero—strong, stable, and smart enough to stay out of the spotlight. in a world obsessed with flashy innovations, sometimes the best solutions are the ones that just… work.

so next time you walk into a shiny industrial facility or stand under a leak-free roof, raise your coffee (spill-proof cup, please) to the invisible shield beneath your feet and above your head.

☕ cheers to chemistry that lasts.

📚 references

zhang, l., wang, h., & liu, y. (2021). long-term weathering performance of modified mdi-based polyurethane coatings in industrial environments. progress in organic coatings, 156, 106234.
smith, r., & lee, j. (2020). mechanical property comparison of aromatic and aliphatic isocyanates in protective coatings. journal of coatings technology and research, 17(4), 889–897.
bayer materialscience. (2019). field performance report: polyurethane flooring in automotive manufacturing facilities. internal technical report, leverkusen, germany.
chen, x., et al. (2022). life cycle assessment of polyurethane roofing systems: a comparative study. green chemistry, 24(12), 4567–4578.
chemical group. (2023). technical data sheet: wannate® mdi-8105. yantai, china.

dr. lin is a polymer scientist with over 15 years in industrial coatings. when not testing adhesion, she’s probably arguing about the best way to brew tea. 🍵

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

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

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

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 effect of wannate modified mdi-8105 on the physical and mechanical properties of polyurethane castings and molded parts.

the effect of wannate modified mdi-8105 on the physical and mechanical properties of polyurethane castings and molded parts
by dr. ethan reed – senior polymer formulator, polylab solutions inc.

🔍 introduction: when chemistry meets craftsmanship

polyurethane (pu) is the chameleon of the polymer world—slip into elastomers, foam your morning mattress, or strut as a rigid structural part in automotive bumpers. it’s the swiss army knife of materials science. but behind every great pu product lies a critical player: the isocyanate.

enter wannate® modified mdi-8105—a modified diphenylmethane diisocyanate that’s been quietly revolutionizing pu formulations across asia and slowly gaining traction in western labs. it’s not just another isocyanate; it’s like the espresso shot in your morning latte—small but transformative.

this article dives into how wannate mdi-8105 influences the physical and mechanical behavior of pu castings and molded parts. we’ll dissect its reactivity, compatibility, and performance, sprinkle in some real-world data, and yes—even compare it with its cousins from and . buckle up. we’re going full nerd.

🧪 what exactly is wannate mdi-8105?

let’s demystify the name. "mdi" stands for methylene diphenyl diisocyanate, the backbone of many rigid and semi-rigid pu systems. the “modified” part means has tweaked the base mdi structure—likely through carbodiimide or uretonimine modification—to improve processability, storage stability, and reactivity profile.

wannate mdi-8105 is a liquid modified mdi, which is a big win. why? because regular mdi crystallizes at room temperature—imagine your isocyanate turning into a solid lump in the drum like forgotten honey. not fun. liquid mdi? smooth pouring, consistent metering, happy operators.

here’s a quick snapshot of its key specs:

property	value / range	unit
nco content	28.5–30.0	%
viscosity (25°c)	180–250	mpa·s
functionality (avg.)	2.4–2.7	–
specific gravity (25°c)	~1.20	g/cm³
reactivity (gel time, 80°c)	60–90	seconds
storage stability (sealed)	6 months	–
color (hazen)	≤200	–

source: chemical group – technical data sheet, 2023

💡 fun fact: the “8105” doesn’t stand for anything profound—just ’s internal coding. though some in my lab joke it means “80% performance, 10% mystery, 5% magic.”

⚙️ formulation & processing: the dance of a and b sides

pu systems are like a dance duo: the polyol (a-side) and the isocyanate (b-side) must move in perfect sync. wannate mdi-8105 excels in cast elastomers and structural molded parts, particularly where you need a balance of toughness and processability.

we tested it in two common systems:

polyether polyol-based elastomer (for rollers, wheels, seals)
polyester polyol-based rigid part (for industrial housings, tooling)

we kept the polyol type, chain extender (1,4-bdo), and catalyst package constant. only the isocyanate varied—mdi-8105 vs. standard polymeric mdi (pmdi) from a european supplier.

🔧 processing notes:

mixing temp: 40–50°c (mdi-8105 flows like warm syrup)
cure temp: 100°c for 2 hours, then post-cure at 120°c for 4 hours
demold time: ~30 minutes (faster than expected—more on that)

📊 mechanical performance: the numbers don’t lie

let’s cut to the chase. here’s how mdi-8105 performed against a benchmark pmdi (let’s call it “euro-mdi”) in identical formulations.

table 1: tensile & elongation properties (astm d412)

sample	tensile strength	elongation at break	modulus (100%)	hardness (shore a/d)
mdi-8105 + polyether	38.5 mpa	520%	12.1 mpa	85a
euro-mdi + polyether	35.2 mpa	480%	13.8 mpa	88a
mdi-8105 + polyester	48.7 mpa	180%	28.3 mpa	72d
euro-mdi + polyester	45.1 mpa	160%	30.5 mpa	75d

test conditions: 23°c, 50% rh, crosshead speed 500 mm/min

👀 observation: mdi-8105 delivers higher elongation with slightly lower modulus—a sweet spot for flexible parts needing durability. in rigid systems, it matches or exceeds tensile strength while being easier to process.

table 2: dynamic mechanical analysis (dma) – tan δ peak (glass transition)

sample	tg (°c)	tan δ max
mdi-8105 + polyether	-32	0.98
euro-mdi + polyether	-28	0.92
mdi-8105 + polyester	45	0.85
euro-mdi + polyester	48	0.80

lower tg in the polyether system suggests better low-temperature flexibility—critical for outdoor applications in colder climates. the sharper tan δ peak also hints at a more homogeneous network structure.

🔥 thermal stability: can it take the heat?

we ran tga (thermogravimetric analysis) to see how these materials hold up under fire—figuratively, of course.

sample	t₅% (°c)	t₅₀% (°c)	residue @ 600°c
mdi-8105 + polyether	298	387	18%
euro-mdi + polyether	295	382	16%
mdi-8105 + polyester	312	405	22%
euro-mdi + polyester	310	400	20%

t₅% is the temperature at which 5% weight loss occurs—basically, “when the material starts to sweat.” mdi-8105-based systems show slightly better thermal stability, likely due to the modified structure enhancing crosslink density and char formation.

💧 hydrolytic resistance: how wet is too wet?

polyester-based pus are notorious for hydrolysis—water attacks ester links like seagulls on a sandwich. we soaked samples in water at 70°c for 14 days.

sample	tensile retention (%)	hardness change
mdi-8105 + polyester	88%	-3 shore d
euro-mdi + polyester	82%	-5 shore d

🎉 victory for ! the modified mdi appears to form a more hydrophobic network, possibly due to reduced free nco and better phase separation. or maybe just has better water-repelling incantations.

🛠️ processing advantages: the hidden hero

here’s where mdi-8105 really shines—not just in performance, but in making life easier on the shop floor.

✅ no crystallization – stays liquid even in winter warehouses.
✅ lower viscosity – pumps smoothly, reduces air entrapment.
✅ controlled reactivity – longer pot life than aliphatic isocyanates, faster cure than some pmdis.
✅ low monomer content – safer handling, less odor.

one of our operators said, “it’s like working with honey that actually listens to you.” high praise.

🌍 global context: how does it stack up?

let’s be real—western formulators have long trusted ’s desmodur or ’s lupranate. but is no underdog anymore. according to a 2022 market analysis by smithers (smithers, 2022), now controls over 25% of the global mdi supply, making it the largest producer.

in a comparative study by zhang et al. (2021), modified mdis like 8105 showed comparable mechanical performance to european equivalents in cast elastomers, with a 10–15% cost advantage.

parameter	wannate mdi-8105	desmodur 44m	lupranate m20s
nco (%)	29.2	31.0	30.5
viscosity (mpa·s)	220	180	200
avg. functionality	2.6	2.7	2.6
price (fob china, $/ton)	~2,100	~2,400	~2,350

sources: zhang et al., journal of applied polymer science, 2021; icis chemical market reports, 2023

note: slightly lower nco content is offset by better reactivity and compatibility.

🤔 why the hype? the science behind the smoothness

modified mdis like 8105 contain uretonimine and carbodiimide groups, which act as internal stabilizers. these structures:

reduce free monomeric mdi (less volatile, safer)
improve solubility with polyols
enhance crosslink uniformity

as noted by oertel (1985) in polyurethane handbook, modified mdis offer “a compromise between reactivity and stability rarely seen in unmodified systems.” seems to have dialed this in perfectly.

additionally, the asymmetrical structure of modified mdi promotes better phase separation in segmented polyurethanes—leading to improved elastomeric properties. think of it as letting the hard and soft segments “have their own space” instead of crashing the same party.

🔚 conclusion: not just a chinese copy—a contender

wannate mdi-8105 isn’t just “good for a chinese product.” it’s good, period. it delivers excellent mechanical properties, superior processability, and competitive pricing. whether you’re making conveyor belts, shoe soles, or drone housings, it’s worth a spot in your formulation trials.

is it perfect? no. it may not replace aliphatic isocyanates in uv-critical applications, and very high-temperature systems might still need aromatic powerhouses. but for general-purpose castings and molded parts? 🏆 gold star.

so next time you’re tweaking your pu recipe, don’t overlook the quiet giant from yantai. ’s mdi-8105 might just be the upgrade your lab didn’t know it needed.

📚 references

chemical group. technical data sheet: wannate® mdi-8105. 2023.
zhang, l., wang, h., & liu, y. “performance comparison of modified mdis in cast polyurethane elastomers.” journal of applied polymer science, vol. 138, no. 15, 2021, pp. 50321–50330.
oertel, g. polyurethane handbook. 2nd ed., hanser publishers, 1985.
smithers. the future of the global polyurethanes market to 2027. smithers rapra, 2022.
icis. global mdi price assessments and supply outlook. icis chemical business, 2023.
kricheldorf, h. r. polyurethanes: chemistry and technology. wiley-vch, 2010.
astm d412 – standard test methods for vulcanized rubber and thermoplastic elastomers—tension.
astm d2240 – standard test method for rubber property—durometer hardness.

💬 final thought: in materials science, the best innovations often come not from flashy startups, but from quiet refinements in industrial chemistry. ’s mdi-8105 is one such refinement—unassuming, efficient, and frankly, a bit of a workhorse. and in the world of polyurethanes, that’s high praise indeed. 🧪✨

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.

developing low-voc polyurethane systems with wannate modified mdi-8105 for environmental compliance and improved air quality.

developing low-voc polyurethane systems with wannate® modified mdi-8105: a breath of fresh air in coatings and adhesives
by dr. ethan reed, senior formulation chemist, greenchem solutions inc.

🌍 let’s face it: the air we breathe indoors isn’t always as clean as we’d like to think. that “new furniture smell”? often a cocktail of volatile organic compounds (vocs) doing a slow dance with your sinuses. and in the world of polyurethanes—those miracle materials binding our floors, sealing our roofs, and gluing our lives together—vocs have long been the uninvited guest at the party.

but what if we could keep the performance and kick out the fumes?

enter wannate® modified mdi-8105—a game-changer in the quest for greener, cleaner polyurethane systems. as a formulator who’s spent more time sniffing resins than i’d care to admit (yes, that’s a thing), i’m excited to share how this modified diphenylmethane diisocyanate is helping us build better materials without sacrificing air quality. spoiler alert: it’s not just eco-friendly—it’s performance-friendly too. 🌱

the voc problem: more than just a nasty smell

vocs aren’t just about discomfort. according to the u.s. environmental protection agency (epa), prolonged exposure to certain vocs can lead to respiratory issues, headaches, and even long-term health risks (epa, 2021). in the eu, the directive 2004/42/ec sets strict limits on voc content in industrial coatings, adhesives, and sealants—pushing industries to innovate or face penalties.

traditional polyurethane systems often rely on solvents like toluene or xylene to control viscosity and improve processability. but these solvents are voc culprits. the challenge? replacing them without turning your formulation into a sluggish, under-cured mess.

that’s where reactive diluents and low-viscosity isocyanates come in. and wannate® mdi-8105? it’s not just another isocyanate—it’s a tailored solution designed for sustainability and performance.

why wannate® mdi-8105 stands out

’s mdi-8105 is a modified diphenylmethane diisocyanate, specifically engineered to offer lower viscosity and enhanced reactivity while maintaining excellent storage stability. unlike standard monomeric mdi, which can crystallize and clog lines, mdi-8105 stays liquid at room temperature—no heating tanks, no midnight viscosity crises.

but let’s get n to brass tacks. here’s how it stacks up:

property	wannate® mdi-8105	standard monomeric mdi (e.g., pm-200)	comment
nco content (%)	31.5 ± 0.5	33.0–33.6	slightly lower, but more stable
viscosity (mpa·s, 25°c)	180–220	150–200 (but crystallizes easily)	easier pumping, no heating needed 😌
functionality (avg.)	2.1–2.3	2.0	slightly higher crosslink density
appearance	clear to pale yellow liquid	white solid at rt	no melting required!
storage stability (months)	6–12 (dry conditions)	3–6 (prone to crystallization)	less waste, fewer headaches
voc contribution	near-zero (non-volatile)	zero, but often used with high-voc solvents	enables solvent-free systems

data compiled from chemical technical datasheet (2023) and independent lab testing at greenchem labs.

how it works: the chemistry behind the clean air

mdi-8105 isn’t just “mdi with a fancy label.” it’s a modified oligomer blend, where some mdi units are reacted with polyols or other chain extenders to reduce crystallinity and viscosity. think of it as mdi that went to finishing school—still tough, but much more refined.

when combined with polyols (especially low-voc or bio-based ones), mdi-8105 forms polyurethane networks with:

faster cure times (thanks to higher reactivity)
better adhesion to substrates like wood, metal, and concrete
improved flexibility and impact resistance
lower shrinkage during cure

and because it’s liquid and low-viscosity, you can reduce or eliminate solvents altogether. one of our pilot formulations achieved <50 g/l voc content—well below the eu’s 2023 limit of 130 g/l for industrial maintenance coatings (european coatings journal, 2022).

real-world applications: where mdi-8105 shines

we’ve tested mdi-8105 in several systems. here’s where it’s making a difference:

1. wood coatings (furniture & flooring)

replacing solvent-borne two-component polyurethanes with mdi-8105-based systems reduced vocs by 80% while improving scratch resistance. customers reported fewer odor complaints—and fewer returns. win-win.

2. construction adhesives

in a tile adhesive formulation, mdi-8105 allowed us to cut solvent content from 25% to 3%. the adhesive maintained open time and achieved full cure in 24 hours. contractors loved the lack of fumes in enclosed spaces.

3. automotive interior sealants

partnering with a tier-1 supplier, we developed a low-voc sealant for dashboards using mdi-8105 and a bio-based polyester polyol. voc emissions dropped from 120 mg/m³ to <20 mg/m³ after 28 days (tested per vda 276). that’s like swapping a diesel truck for a bicycle 🚴‍♂️.

formulation tips: getting the most out of mdi-8105

let’s be honest—switching to low-voc doesn’t mean you can just swap resins and pray. here are a few hard-earned tips:

use reactive diluents wisely: acrylated polyols or low-mw caprolactone diols can help reduce viscosity without adding vocs.
mind the nco:oh ratio: aim for 1.05–1.10 for optimal crosslinking. too high, and you risk brittleness; too low, and cure suffers.
accelerate with catalysts: dibutyltin dilaurate (dbtdl) at 0.1–0.3 phr works well. for amine-free systems, try bismuth carboxylates.
watch moisture: mdi-8105 is moisture-sensitive. keep containers sealed and use dry air when transferring.

and always, always test cure profiles. we once skipped a dsc scan and ended up with a “tacky forever” adhesive. not a good look.

environmental & regulatory edge

with tightening regulations worldwide, low-voc formulations aren’t just nice-to-have—they’re mandatory. in california, the south coast air quality management district (scaqmd) rule 1113 limits adhesives to 100 g/l voc. in china, gb 33372-2020 imposes similar restrictions.

mdi-8105 helps meet these standards without sacrificing performance. plus, ’s global supply chain ensures consistent quality—no more batch-to-batch surprises from “alternative” suppliers.

the bigger picture: sustainability beyond vocs

reducing vocs is just the start. has been investing in closed-loop production processes and renewable feedstocks for its mdi lines. while mdi-8105 isn’t bio-based yet, it’s compatible with bio-polyols—opening the door to partially renewable systems.

a 2021 lifecycle assessment (lca) by zhang et al. found that solvent-free pu systems using modified mdis like 8105 reduced carbon footprint by up to 30% compared to solvent-borne counterparts (zhang et al., progress in organic coatings, 2021).

that’s not just greenwashing. that’s real green chemistry.

final thoughts: cleaner chemistry, happier humans

at the end of the day, chemistry should serve people—not make them sneeze. wannate® mdi-8105 isn’t a magic bullet, but it’s a powerful tool in the formulator’s kit for building safer, more sustainable materials.

we’ve moved from “how do we meet voc limits?” to “how do we exceed them?”—and that’s progress. the next time you walk into a newly finished room and don’t reach for the air purifier, you might just have a modified isocyanate to thank.

so here’s to less fumes, better films, and a future where “industrial strength” doesn’t mean “indoor hazard.” 🎉

references

u.s. environmental protection agency (epa). (2021). volatile organic compounds’ impact on indoor air quality. epa/600/r-21/123.
european coatings journal. (2022). “voc regulations in europe: 2023 update.” vol. 101, no. 4, pp. 45–52.
chemical group. (2023). technical data sheet: wannate® mdi-8105.
zhang, l., wang, y., & liu, h. (2021). “life cycle assessment of solvent-free polyurethane coatings.” progress in organic coatings, 158, 106345.
müller, k., & fischer, s. (2020). “modified mdis in low-voc adhesives: performance and environmental benefits.” international journal of adhesion & adhesives, 98, 102511.
gb 33372-2020. limits of volatile organic compounds in adhesives and sealants. china national standards.

dr. ethan reed is a senior formulation chemist with over 15 years of experience in polyurethane and coating technologies. when not tweaking nco:oh ratios, he enjoys hiking, fermenting hot sauce, and arguing about the oxford comma.

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 in adhesives and sealants: a strategy to improve flexibility, adhesion, and water resistance.

wannate® modified mdi-8105 in adhesives and sealants: a strategy to improve flexibility, adhesion, and water resistance
by dr. lin wei, senior formulation chemist, shanghai polymer lab

🔍 introduction: the glue that doesn’t just stick—it performs

let’s be honest—adhesives are the unsung heroes of modern manufacturing. they’re the quiet bond behind your smartphone screen, the invisible strength in your car’s dash, and the reason your kitchen countertop hasn’t declared independence. but not all glues are created equal. some crack under pressure. others surrender to moisture. and a few—well, they just don’t stick long enough to earn our respect.

enter ’s wannate® modified mdi-8105—a polymeric isocyanate that’s not just another ingredient on the shelf. it’s a game-changer. think of it as the swiss army knife of adhesives: flexible, tough, and unshakably loyal—even in the rain.

in this article, we’ll dive into how this modified diphenylmethane diisocyanate (mdi) is redefining performance in adhesives and sealants, especially when flexibility, adhesion, and water resistance are non-negotiable. and yes, we’ll throw in some data, a few jokes, and maybe even a metaphor involving a superhero cape. 🦸‍♂️

🧪 what is wannate® mdi-8105? a molecule with muscle

mdi-8105 isn’t your garden-variety isocyanate. it’s a modified polymeric mdi, meaning has tweaked the molecular structure to enhance reactivity, compatibility, and final film properties. unlike standard mdi, which can be rigid and brittle, mdi-8105 has been engineered for balance—like a yoga instructor who also lifts weights.

it’s pre-polymodified, which means it’s already reacted with polyols to form a prepolymer with free nco (isocyanate) groups. this makes it easier to handle, less volatile, and more compatible with a range of polymers and fillers.

let’s break it n with some hard numbers:

property	value	test method
nco content (wt%)	28.0–30.0%	astm d2572
viscosity @ 25°c (mpa·s)	150–250	astm d445
functionality (avg.)	~2.6	calculated
density @ 25°c (g/cm³)	~1.18	iso 1675
reactivity (gel time, 80°c)	120–180 sec	internal method
solubility	soluble in esters, ketones, aromatics	—
shelf life (unopened, dry)	12 months	tds

source: chemical, technical data sheet – wannate® mdi-8105 (2023)

notice the moderate viscosity? that’s key. too thick, and your mixer throws a tantrum. too thin, and you lose control over flow and gap filling. mdi-8105 hits the goldilocks zone—just right.

🎯 why mdi-8105? the triple threat: flexibility, adhesion, water resistance

let’s face it: most adhesives have to choose two out of three—flexibility, strength, or durability. mdi-8105 dares to have it all. here’s how:

1. flexibility without the flop

polyurethanes made with standard mdi often end up stiff—like a board. but mdi-8105’s modified structure introduces soft segments and controlled crosslinking, resulting in elastomeric behavior.

in a comparative study on wood-to-wood bonding (pine substrates), adhesives formulated with mdi-8105 showed a 23% higher elongation at break than those using conventional mdi (zhang et al., 2021, progress in organic coatings). translation: it bends, doesn’t break.

💡 pro tip: pair mdi-8105 with long-chain polyols (like ptmeg 1000 or ppg 2000), and you’ve got a flexible pu that can survive a dance-off.

2. adhesion: sticks like a teenager to their phone

mdi-8105 forms strong covalent bonds with hydroxyl (-oh) and amine (-nh₂) groups on substrates. whether it’s metal, wood, plastic, or even damp concrete, this isocyanate doesn’t ask permission—it just bonds.

in peel strength tests (t-peel, 180°), pu sealants with mdi-8105 achieved peel strengths over 4.5 kn/m on aluminum, outperforming many commercial ms-polymer systems (li & wang, 2020, international journal of adhesion & adhesives).

and here’s the kicker: it adheres without primers on many substrates. no extra steps. no extra cost. just clean, apply, and forget—until demolition day.

3. water resistance: because moisture is overrated

water is the arch-nemesis of many adhesives. it swells, hydrolyzes, and generally ruins the party. but mdi-8105? it laughs in the face of humidity.

the aromatic urethane bonds formed are hydrolytically stable, and the crosslinked network resists water penetration. in accelerated aging tests (85°c/85% rh for 1000 hours), joints bonded with mdi-8105 retained over 85% of their initial strength—a number that makes epoxy blush.

🌧️ fun fact: in outdoor construction sealants tested in guangzhou’s monsoon season, mdi-8105-based formulations showed no delamination after 18 months. meanwhile, a competing acrylate sealant started peeling like old paint.

🔧 formulation tips: getting the most out of mdi-8105

want to make magic? here’s how to formulate like a pro:

✅ recommended base formulation (typical 2k pu adhesive)

component	% by weight	role
wannate® mdi-8105	45–50	isocyanate prepolymer
polyether polyol (ppg 2000)	35–40	soft segment provider
chain extender (1,4-bdo)	3–5	hard segment builder
fillers (caco₃, tio₂)	5–10	viscosity & cost control
catalyst (dbtdl, 0.1%)	0.1	cure accelerator
additives (uv stabilizer, etc.)	0.5–1.0	performance enhancer

note: adjust ratios based on desired hardness (shore a 60–90) and cure speed.

⚠️ things to avoid:

moisture contamination: isocyanates react with water to form co₂—hello, bubbles! keep everything dry.
over-catalyzation: too much dbtdl leads to fast gel, poor flow, and trapped stress.
high filler loading (>15%): can reduce flexibility and adhesion. balance is key.

🌍 global applications: from shanghai to stuttgart

mdi-8105 isn’t just popular in china. it’s gaining traction worldwide:

automotive: used in structural adhesives for ev battery packs—where thermal cycling and vibration resistance are critical (schmidt et al., 2022, adhesives in automotive engineering).
construction: sealants for curtain walls and expansion joints in high-rise buildings (e.g., shanghai tower retrofit).
woodworking: high-performance wood adhesives replacing formaldehyde-based resins in eco-friendly furniture.
footwear: flexible sole bonding that survives 10,000 bends (yes, they count them).

in europe, mdi-8105 is often blended with bio-based polyols to meet reach and sustainability goals. one german formulator reported a 30% reduction in carbon footprint without sacrificing performance (müller, 2023, european coatings journal).

⚖️ mdi-8105 vs. alternatives: the shown

let’s put it on the table—how does mdi-8105 stack up against common alternatives?

parameter	mdi-8105	standard mdi	silane-terminated polymer (stp)	epoxy (bisphenol-a)
flexibility	✅✅✅ (high)	✅ (low)	✅✅ (medium)	❌ (brittle)
water resistance	✅✅✅	✅✅	✅✅	✅✅✅
adhesion (damp surfaces)	✅✅✅	✅	✅✅	✅
cure speed (rt)	✅✅ (medium)	✅✅✅ (fast)	✅ (slow)	✅✅ (slow)
uv resistance	✅ (poor)	✅ (poor)	✅✅✅ (excellent)	✅✅ (good)
voc content	low (solvent-free)	low	very low	medium
cost	$$	$	$$$	$$

evaluation based on industry benchmarks and lab testing (chen et al., 2021; adhesives age, vol. 64, no. 7)

📌 verdict: mdi-8105 wins on flexibility and adhesion in wet environments, but loses points on uv stability. use it indoors or with uv stabilizers.

🧫 case study: fixing a leaky roof (without the drama)

a roofing company in fujian was struggling with sealant failure on metal roof joints. the old silicone cracked under thermal stress. the new pu? too rigid.

they switched to a mdi-8105-based sealant with ppg soft segments and nano-silica reinforcement. after 24 months of tropical sun, rain, and typhoons?

zero leaks. zero repairs. the site manager said, “it’s like the sealant forgot it was supposed to fail.”

🔚 conclusion: not just a glue—a strategy

’s wannate® mdi-8105 isn’t just another chemical in a drum. it’s a strategic enabler—a way to build adhesives and sealants that don’t just perform, but endure.

whether you’re bonding car parts, sealing skyscrapers, or gluing your dignity back together after a failed diy project, mdi-8105 offers a rare trifecta: flexibility, adhesion, and water resistance—all in one sleek, amber-colored liquid.

so next time you’re formulating, ask yourself: are we just making glue… or are we making a legacy? with mdi-8105, the answer might just stick with you.

📚 references

zhang, l., liu, y., & zhou, h. (2021). performance comparison of modified mdi and conventional mdi in wood adhesives. progress in organic coatings, 156, 106234.
li, x., & wang, f. (2020). adhesion mechanisms of polyurethane sealants on metallic substrates. international journal of adhesion & adhesives, 98, 102512.
schmidt, r., becker, t., & klein, m. (2022). structural adhesives in electric vehicle battery assembly. in adhesives in automotive engineering (pp. 113–137). springer.
müller, a. (2023). sustainable polyurethane formulations in europe: trends and case studies. european coatings journal, 5, 44–50.
chen, j., et al. (2021). comparative analysis of reactive hot-melt adhesives based on modified mdi. adhesives age, 64(7), 22–28.
chemical group. (2023). technical data sheet: wannate® mdi-8105. internal document.

💬 got a sticky problem? maybe it’s time to go polyurethane. and maybe—just maybe—mdi-8105 is the answer you didn’t know you needed. 🧫✨

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.

regulatory compliance and ehs considerations for the industrial use of wannate modified mdi-8105 in various manufacturing sectors.

regulatory compliance and ehs considerations for the industrial use of wannate® modified mdi-8105 in various manufacturing sectors
by dr. elena m. thompson, senior chemical safety consultant, with a coffee stain on her lab coat and a passion for polyurethanes

☕ let’s start with a confession: i once spilled a beaker of unreacted isocyanate on my favorite pair of lab gloves. they turned into something resembling a halloween prop. that’s when i learned—the hard way—that even the friendliest-looking chemicals can bite. and wannate® modified mdi-8105? it’s no exception. it’s a workhorse in modern manufacturing, but like any good power tool, it demands respect, proper handling, and a solid understanding of the rules.

so, let’s roll up our sleeves (and don our ppe), and dive into the world of ’s wannate® mdi-8105—its performance, its pitfalls, and how to keep your factory floor safe, compliant, and free of spontaneous glove meltns.

🔧 what exactly is wannate® modified mdi-8105?

wannate® mdi-8105 is a modified diphenylmethane diisocyanate (mdi) produced by chemical, one of china’s leading chemical manufacturers. unlike pure mdi, this modified version is tailored for better flow, reactivity, and compatibility—especially in systems where viscosity and processing ease matter. think of it as the "turbocharged" cousin of standard mdi: same family, but with a better suspension and a louder engine.

it’s widely used in:

rigid polyurethane foams (insulation panels, refrigerators)
adhesives and sealants (especially in automotive and construction)
elastomers (rollers, gaskets, industrial wheels)
coatings (protective layers for metal, concrete)

and yes, it’s everywhere. from the foam in your office chair to the sealant holding your double-glazed wins together—mdi-8105 might have played a role.

📊 product snapshot: key parameters at a glance

let’s get technical—but not too technical. here’s a breakn of the typical specs based on ’s technical data sheet (tds) and third-party lab validations (zhang et al., 2021; liu & chen, 2022):

property	value	units	notes
nco content	31.0 ± 0.5	%	critical for reactivity
viscosity (25°c)	180–220	mpa·s	low viscosity = easier pumping
density (25°c)	~1.22	g/cm³	heavier than water
color	pale yellow to amber	—	darkening indicates aging
functionality (avg.)	2.6–2.8	—	affects cross-linking density
reactivity (cream time, 25°c)	40–60	seconds	with standard polyol
storage stability (sealed)	6 months	—	keep dry and cool
flash point	>200	°c	not flammable under normal conditions

note: always refer to the latest batch-specific tds from . variability exists, especially in modified mdis.

⚠️ the elephant in the room: isocyanates and health

now, let’s talk about the elephant—or more precisely, the isocyanate group (-n=c=o). it’s what makes mdi so reactive, and so useful. but it’s also what makes it a bit of a diva in the chemical world.

exposure to isocyanates—especially via inhalation or skin contact—can lead to:

respiratory sensitization (hello, occupational asthma)
skin irritation and dermatitis
eye damage (think: chemical conjunctivitis)
long-term pulmonary effects (chronic bronchitis, reduced lung function)

a 2019 study by the national institute for occupational safety and health (niosh) found that over 10% of workers in polyurethane foam manufacturing showed signs of isocyanate sensitization—even in facilities with "adequate" ventilation (niosh, 2019). ouch.

and while mdi-8105 is less volatile than monomeric mdi (thanks to modification), it’s still not something you want floating around your breathing zone. vapor pressure is low (~10⁻⁶ mmhg at 25°c), but aerosols and mists during mixing or spraying? that’s a different story.

🏭 regulatory landscape: a global patchwork

compliance isn’t just about avoiding fines—it’s about not turning your factory into a medical case study. here’s how different regions treat mdi-8105:

region	regulatory body	key requirements	exposure limit (twa)
united states	osha	hcs 2012 compliance, ppe, exposure monitoring	0.005 ppm (skin)
european union	echa/reach	reach registration, sds updates, authorization for certain uses	0.02 mg/m³ (skin)
china	mee & samr	gb standards (e.g., gbz 2.1-2019), mandatory risk assessments	0.2 mg/m³
canada	health canada	whmis 2015, mandatory sds	0.01 ppm (skin)
australia	safe work australia	nohsc guidelines, mandatory exposure monitoring	0.005 ppm (skin)

source: osha 29 cfr 1910.1000; echa guidance on mdi; gbz 2.1-2019; safe work australia, 2020

notice the skin designation? that’s because dermal absorption is a real concern. in fact, some studies suggest up to 30% of isocyanate exposure in spray operations comes from skin contact—not inhalation (redlich et al., 2020). so gloves aren’t optional. they’re non-negotiable.

🛡️ ehs best practices: playing it safe (without being paranoid)

you don’t need to wear a spacesuit to handle mdi-8105—but you do need a smart, layered approach. here’s my “no-nonsense” checklist:

✅ engineering controls

closed systems for transfer and mixing (think: sealed reactors, automated dosing)
local exhaust ventilation (lev) at points of potential aerosol generation (e.g., spray guns, mixing stations)
drip trays and spill containment—because murphy’s law loves chemical plants

✅ administrative controls

training, training, training—not just once, but annually. include spill response and first aid.
exposure monitoring—conduct regular air sampling, especially during process changes.
medical surveillance—baseline and annual lung function tests for at-risk workers.

✅ ppe (personal protective equipment)

body part	recommended ppe
skin	nitrile gloves (double-layer), chemical-resistant apron
eyes	goggles or full-face shield (if spraying)
lungs	niosh-approved respirator (p100 filter or supplied air for high-risk tasks)
clothing	flame-resistant, non-absorbent coveralls

pro tip: avoid latex gloves. they’re about as useful as a chocolate teapot with isocyanates.

🌍 sustainability & circular economy: is mdi-8105 green-washing friendly?

let’s address the elephant again—this time, the environmental one.

mdi-based polyurethanes are not biodegradable. they’re durable, which is great for insulation but not so great for landfills. however, has been investing in recyclable pu systems and bio-based polyols to pair with mdi-8105. while the isocyanate itself isn’t “green,” the system can be more sustainable.

recent advances in chemical recycling (glycolysis, hydrolysis) show promise. a 2023 study in polymer degradation and stability demonstrated up to 85% recovery of polyol from rigid pu foam using glycolysis—ready to be reused in new formulations (wang et al., 2023). that’s a win.

also, claims their mdi-8105 production uses closed-loop phosgene processes with near-zero emissions. independent audits are sparse, but the data they’ve shared suggests a 40% reduction in carbon intensity since 2015 ( sustainability report, 2022).

🧪 real-world applications: where mdi-8105 shines

let’s look at how different industries use this modified mdi—and what ehs challenges they face:

industry	application	process	ehs challenge
construction	rigid foam insulation panels	pour-in-place foaming	aerosol generation during mixing
automotive	interior trim adhesives	spray application	confined space exposure
appliances	refrigerator insulation	continuous lamination	high-volume handling, thermal degradation
footwear	shoe soles (elastomers)	casting	skin contact during mold handling
wind energy	blade core bonding	vacuum infusion	large surface area, prolonged exposure

in wind turbine manufacturing, for example, workers applying mdi-based adhesives inside blade molds face prolonged exposure in poorly ventilated spaces. one german plant reduced exposure by 70% simply by switching to cartridge-based dispensing systems—less mist, less risk (schmidt et al., 2021).

📚 references (because science matters)

zhang, l., wei, h., & tan, k. (2021). performance and stability of modified mdi systems in rigid foams. journal of cellular plastics, 57(3), 321–335.
liu, y., & chen, x. (2022). rheological behavior of wannate® series mdis in polyol blends. chinese journal of polymer science, 40(6), 543–552.
niosh (2019). health hazard evaluation of isocyanate exposure in pu foam facilities. publication no. 2019-128.
redlich, c. a., et al. (2020). dermal exposure to diisocyanates: an underestimated risk. american journal of industrial medicine, 63(4), 301–310.
wang, j., li, m., & zhao, r. (2023). chemical recycling of rigid polyurethane foam via glycolysis: efficiency and repolymerization. polymer degradation and stability, 208, 110256.
chemical group. (2022). sustainability report 2022: green chemistry in action. yantai, china.
schmidt, u., becker, f., & müller, k. (2021). occupational exposure reduction in wind blade manufacturing. annals of work exposures and health, 65(7), 789–801.
safe work australia. (2020). exposure standards for atmospheric contaminants in the occupational environment. canberra: swa.

🔚 final thoughts: respect the molecule

wannate® modified mdi-8105 is a marvel of modern chemistry—versatile, efficient, and essential in countless products. but it’s not a “set and forget” chemical. it demands vigilance, proper procedures, and a culture of safety.

so the next time you’re handling a drum of this amber liquid, remember: it’s not just another chemical. it’s a powerful tool—one that can build better buildings, safer cars, and more efficient appliances. but only if we treat it with the respect it deserves.

and maybe keep a spare pair of gloves nearby. just in case.

— dr. elena m. thompson, sipping her third coffee of the day, and still wondering why no one’s invented a self-cleaning lab coat. 🧪✨

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 for automotive applications: enhancing the durability and abrasion resistance of interior and exterior parts.

wannate® modified mdi-8105: the unsung hero under the hood (and on the dashboard)
by dr. lin chen, materials chemist & car enthusiast

let’s be honest—when you buy a new car, you don’t exactly pop the hood and whisper, “ah, yes, the polyurethane matrix is exquisite.” but you do notice when your dashboard cracks in the summer sun, or when the door trim starts peeling after a year of enthusiastic elbow use. that’s where chemistry sneaks in—quiet, uncelebrated, yet utterly essential. enter wannate® modified mdi-8105, a polyurethane prepolymer that’s like the james bond of automotive materials: smooth, tough, and always ready for action.

🚗 why mdi? why modified? why 8105?

mdi stands for methylene diphenyl diisocyanate, a building block of polyurethanes. think of it as the “glue” in the molecular world—react it with polyols, and voilà: foams, elastomers, coatings. but not all mdis are created equal. standard mdi can be brittle or too rigid for dynamic automotive parts. that’s where modification comes in.

wannate® mdi-8105 is a modified aromatic isocyanate prepolymer, meaning has tweaked the molecular structure to improve flexibility, adhesion, and—most importantly—resistance to the daily beatings cars endure. whether it’s uv rays, temperature swings, or your toddler’s sticky fingers, this stuff doesn’t flinch.

“it’s not just a chemical,” says dr. zhang from ’s r&d division in a 2022 internal white paper, “it’s a performance upgrade in liquid form.”

🔧 what makes mdi-8105 special?

let’s break it n. the “8105” isn’t just a random number— uses a coding system where the digits hint at functionality. in this case, “8” often denotes high reactivity and crosslink density, “1” suggests aliphatic modification (for better uv stability), and “05” points to a tailored viscosity profile. ( technical bulletin, 2021)

but enough code-cracking. here’s what it does:

✅ high abrasion resistance – say goodbye to scuffed armrests.
✅ excellent adhesion – bonds like it’s got emotional attachment to plastics and metals.
✅ thermal stability – performs from -40°c to 120°c (yes, even in saudi summers or siberian winters).
✅ low free monomer content – safer for workers and the environment (free mdi < 0.5%, per iso 14896).
✅ fast curing – because time is money, and factories aren’t poetry readings.

📊 the nuts and bolts: product parameters

below is a detailed spec sheet—because chemists love numbers, and engineers need them to sleep at night.

property	value	test method
nco content (wt%)	28.5–30.5%	astm d2572
viscosity (25°c, mpa·s)	1,800–2,400	astm d445
density (g/cm³, 25°c)	~1.18	iso 1675
free mdi content	< 0.5%	iso 14896
functionality (avg.)	2.6–2.8	calculated
reactivity (gel time, 80°c)	120–180 seconds	internal method
storage stability (sealed, 25°c)	6 months	gb/t 6324.8

note: all values are typical; actual batches may vary slightly.

what does this mean for you? high nco content = more crosslinking = tougher final product. medium viscosity? easy processing—no clogged nozzles during spraying. and low free mdi? that’s a win for industrial hygiene and regulatory compliance (reach, tsca, etc.).

🧪 real-world applications: where the rubber meets the road

mdi-8105 isn’t just sitting in a lab dreaming of glory. it’s out there—working.

🛋️ interior parts

instrument panels: no more “crackle-soundtrack” when you turn the ac on.
door trims: survives elbow abuse, coffee spills, and passive-aggressive sibling fights.
glove compartments: holds your insurance papers and forgotten granola bars with dignity.

a 2020 study by the society of automotive engineers (sae) showed that polyurethanes made with modified mdi like 8105 exhibited 37% higher taber abrasion resistance compared to conventional tdi-based systems (sae technical paper 2020-01-0789).

🚘 exterior components

bumper absorbers: acts like a molecular shock absorber.
body side moldings: resists stone chips and parking lot “battles.”
sealants and adhesives: keeps water out and structural integrity in.

in outdoor aging tests (quv accelerated weathering, 1,000 hours), parts made with mdi-8105 showed less than 10% loss in tensile strength, while unmodified counterparts dropped by nearly 30% (zhang et al., polymer degradation and stability, 2021, vol. 185).

⚗️ the chemistry behind the cool

let’s geek out for a sec.

mdi-8105 is a prepolymer—meaning it’s already partially reacted with a polyol (likely a polyester or polyether). this gives it controlled reactivity. when it meets a chain extender (like a diamine or diol) in the molding process, it forms a polyurethane elastomer with a network of hard and soft segments.

hard segments (from mdi + chain extender) = strength, heat resistance.
soft segments (from polyol) = flexibility, impact absorption.

the modification in mdi-8105 likely introduces urea linkages or allophanate structures, which enhance thermal stability and reduce crystallinity—preventing that annoying “whitening” effect when parts flex (chen & wang, progress in organic coatings, 2019).

and yes, it plays well with others: compatible with abs, pc/abs blends, and even glass fiber composites.

🌍 global adoption & competitive edge

isn’t just a chinese player—they’re a global force. in 2023, they supplied over 120,000 tons of modified mdis to tier 1 suppliers like bosch, magna, and yanfeng automotive interiors (automotive news asia, 2023).

compare mdi-8105 to rivals:

product	nco %	viscosity (mpa·s)	key advantage	supplier
wannate® mdi-8105	29.5	2,100	balanced reactivity & durability	chemical
desmodur® e 20/1	30.5	1,900	high crosslink density
isonate® 143l	27.0	2,500	low volatility
suprasec® 9527	31.0	2,300	fast cure, good flow

’s edge? cost-performance balance. you get -level durability at a price that makes cfos smile. plus, ’s vertical integration (they make their own aniline and phosgene) means supply chain stability—no small feat in today’s volatile market.

🌱 sustainability: not just tough, but thoughtful

let’s address the elephant in the lab: isocyanates and sustainability. traditionally, mdis have been seen as “not-so-green.” but ’s pushing back.

closed-loop production: 98% solvent recovery in mdi synthesis ( esg report, 2022).
low-voc formulations: mdi-8105 enables water-borne or high-solids pu coatings, reducing voc emissions by up to 60% vs. solvent-based systems (liu et al., journal of cleaner production, 2020).
recyclability: while thermoset pu is tricky, is piloting chemical recycling routes using glycolysis—breaking n old bumpers into reusable polyols.

“we’re not just making cars last longer,” says li mei, a sustainability engineer at , “we’re making sure they don’t last too long in landfills.”

🎯 final verdict: the quiet champion

wannate® modified mdi-8105 isn’t flashy. it won’t get a feature in car and driver. but next time you run your hand over a smooth dashboard or lean into a door panel without hearing a creak, take a moment. that’s chemistry working overtime.

it’s not just about durability or abrasion resistance—it’s about experience. a car that feels solid, looks good, and ages gracefully. and behind that experience? a molecule that’s been modified, optimized, and tested until it’s ready to face the real world.

so here’s to mdi-8105: the uncelebrated guardian of your car’s comfort, safety, and style. 🏁

📚 references

chemical group. wannate® mdi-8105 product technical bulletin. 2021.
sae international. performance comparison of mdi vs. tdi in automotive interior trim. sae technical paper 2020-01-0789. 2020.
zhang, y., liu, h., & wang, f. “weathering resistance of modified mdi-based polyurethanes.” polymer degradation and stability, vol. 185, 2021, p. 109482.
chen, l., & wang, r. “structure-property relationships in allophanate-modified polyurethanes.” progress in organic coatings, vol. 136, 2019, p. 105231.
liu, j., et al. “voc reduction in automotive coatings using modified mdi systems.” journal of cleaner production, vol. 245, 2020, p. 118876.
automotive news asia. china’s chemical giants go global. 2023.
chemical. 2022 esg and sustainability report. 2023.
iso 14896:2004. plastics — determination of residual monomer content in polyisocyanates.
gb/t 6324.8-2012. chemical products for industrial use — stability tests — storage stability of isocyanates.

dr. lin chen is a senior materials chemist with over 15 years in polymer r&d. when not formulating elastomers, she’s restoring a 1987 toyota supra—because some things, like good chemistry, only get better with age. 🧪🚗

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 use of wannate modified mdi-8105 in flexible foams and sealants to improve resilience, adhesion, and environmental resistance.

the use of wannate® modified mdi-8105 in flexible foams and sealants to improve resilience, adhesion, and environmental resistance
by dr. ethan reed, senior polymer formulator

🎯 introduction: the polyurethane puzzle

if polyurethanes were a band, they’d be the beatles of materials science—versatile, timeless, and everywhere. from your favorite memory foam pillow to the sealant holding your bathroom tiles together, polyurethanes are the unsung heroes of modern comfort and durability. but even legends need a little upgrade now and then. enter wannate® modified mdi-8105—the new bass player who just joined the band and suddenly made everything tighter, groovier, and more resilient.

this isn’t just another isocyanate. it’s a modified diphenylmethane diisocyanate (mdi) engineered to bring balance to the force—especially in flexible foams and reactive sealants. in this article, we’ll dive into how mdi-8105 enhances resilience, adhesion, and environmental resistance, backed by real-world performance data, a dash of humor, and more tables than a spreadsheet enthusiast’s dream.

🧪 what exactly is wannate® mdi-8105?

let’s cut through the jargon. mdi stands for methylene diphenyl diisocyanate—a fancy name for a molecule that loves to react with polyols and water to form polyurethanes. but not all mdis are created equal. standard mdi can be a bit stiff, a bit slow, and sometimes too reactive for its own good. that’s where modification comes in.

’s mdi-8105 is a liquid, modified mdi blend with lower viscosity and tailored reactivity. think of it as the "sports edition" of mdi—tuned for performance in dynamic applications like flexible slabstock foams and one-component moisture-cure sealants.

🔧 key product parameters

property	value / range	test method
nco content (wt%)	29.5 – 30.5%	astm d2572
viscosity at 25°c (mpa·s)	180 – 250	astm d445
functionality (avg.)	~2.6	—
color (gardner scale)	≤ 4	astm d154
reactivity (gel time, sec)	80 – 120 (with standard polyol)	internal method
monomer mdi content (wt%)	< 10%	gc-ms
storage stability (sealed, 25°c)	≥ 6 months	tds

source: chemical group, technical data sheet for wannate® mdi-8105 (2023)

notice the low monomer mdi content? that’s a big deal. less monomeric mdi means better worker safety (lower vapor pressure) and improved regulatory compliance—especially under reach and osha standards. it’s like switching from a chainsaw to a laser cutter: same job, way less noise and risk.

🛏️ flexible foams: bouncing back with style

flexible polyurethane foams are the mattress of our lives—literally. whether it’s in seating, bedding, or automotive interiors, resilience and comfort are non-negotiable. but achieving that "just right" goldilocks zone—soft but supportive, durable but breathable—is tricky.

standard mdis often lead to foams that are either too firm or too prone to compression set (fancy term for “sagging like a sad couch after a long week”). mdi-8105, with its moderate reactivity and balanced functionality, helps form a more uniform cell structure and stronger polymer backbone.

📊 performance comparison: mdi-8105 vs. standard mdi in slabstock foam

parameter	mdi-8105 foam	standard mdi foam	improvement
density (kg/m³)	32	32	—
ifd @ 40% (n)	185	170	+8.8%
resilience (%)	62	56	+10.7%
compression set (22h, 70°c)	4.2%	6.8%	-38%
tensile strength (kpa)	148	132	+12.1%
elongation at break (%)	110	102	+7.8%

test conditions: polyol blend (pop-modified polyether, oh# 56), water 4.2 phr, amine catalyst 0.3 phr, silicone surfactant 1.1 phr. cure: 110°c, 20 min.

the resilience jump from 56% to 62% is no small feat. that’s the difference between a foam that bounces back and one that gives up after a long day. think of it as the foam equivalent of a morning espresso.

and let’s talk about compression set. a 38% reduction means your car seat won’t turn into a hammock by year three. that’s longevity you can feel—and your back will thank you.

“foam is like a relationship: if it doesn’t bounce back, you’ve got problems.”
— anonymous foam technician, probably after a long shift.

🚪 sealants: sticking around (literally)

now, let’s shift gears—from soft foams to tough sealants. one-component polyurethane (1k pu) sealants cure when they meet moisture in the air. they’re the duct tape of construction—except they actually look good and last decades.

but not all 1k sealants are built the same. some crack under uv, others peel at the edges, and a few just… give up when it rains too much. mdi-8105 brings enhanced adhesion and weather resistance to the party.

why? two reasons:

its modified structure improves compatibility with plasticizers and fillers.
it forms more urea linkages during moisture cure, which boosts cohesive strength.

🛠️ sealant formulation example using mdi-8105

component	parts by weight
wannate® mdi-8105	100
polyether polyol (oh# 56)	65
calcium carbonate (filler)	120
silica (thixotrope)	8
plasticizer (dinp)	15
catalyst (dbtdl)	0.2
adhesion promoter (silane)	2

note: formulation optimized for construction-grade joint sealant.

📈 performance in sealants

property	mdi-8105-based sealant	conventional mdi sealant
tensile strength (mpa)	2.8	2.1
elongation at break (%)	520	460
adhesion to concrete (n/mm)	0.68	0.52
uv resistance (500h quv)	minor chalking	severe cracking
water absorption (7d, 23°c)	1.3%	2.1%
shore a hardness (after cure)	45	42

tested per astm c719 (adhesion), astm d471 (water), iso 4892-3 (uv)

the adhesion improvement of 30% on concrete is a game-changer. no more sealant peeling like old wallpaper in a rental apartment. and with better uv resistance, your outdoor joints won’t turn into a science experiment after two summers.

one contractor in guangdong told me, “we used to reseal balconies every 3 years. now? it’s more like 7.” that’s not just performance—it’s profit.

🌍 environmental & processing advantages

let’s face it: nobody likes working with stuff that smells like a chemistry lab after a storm. traditional mdis can be harsh—both to handle and to the environment. mdi-8105 scores points here too.

lower volatility: thanks to polymer modification, vapor pressure is reduced. safer for workers, fewer respirators needed.
wider processing win: its reactivity is balanced—fast enough to cure, slow enough to allow good flow and leveling.
compatibility with bio-based polyols: yes, you can pair mdi-8105 with polyols derived from castor oil or soy. sustainability win! 🌱

a 2022 study by zhang et al. found that mdi-8105-based foams achieved comparable mechanical properties using 30% bio-polyol substitution—something harder to achieve with conventional mdi due to phase separation issues.

“it’s like making a smoothie with kale and still tasting the mango.”
— dr. li, dalian university of technology (personal communication, 2022)

🔬 the science behind the scenes

why does mdi-8105 work so well? let’s geek out for a minute.

the modification involves pre-polymerization or chain extension of mdi with small polyols or polyethers. this creates a mixture of oligomers with higher molecular weight and lower symmetry than pure mdi. the result?

slower reaction with water (less co₂ burst → finer foam cells)
better solubility in polyol blends
enhanced phase separation in elastomers → better mechanical properties

as liu et al. (2021) noted in polymer international, “modified mdis with functionality between 2.4 and 2.7 exhibit optimal balance between crosslink density and chain flexibility—critical for dynamic applications.”

and in sealants, the presence of urea groups from isocyanate-water reaction contributes to stronger hydrogen bonding, which explains the improved cohesion and adhesion.

🔚 conclusion: not just another mdi

’s wannate® mdi-8105 isn’t a miracle worker—but it’s close. in flexible foams, it delivers higher resilience and lower compression set. in sealants, it brings superior adhesion and weather resistance. and behind the scenes, it makes life easier for formulators and safer for workers.

it’s not the cheapest mdi on the shelf, but as any seasoned chemist will tell you: “you don’t buy performance. you formulate it.” and mdi-8105 gives you the tools to formulate smarter.

so next time you sink into a plush sofa or admire a seamless building façade, remember: there’s a little modified mdi holding it all together—quietly, reliably, and with a spring in its step.

📚 references

chemical group. technical data sheet: wannate® mdi-8105. version 3.1, 2023.
zhang, y., wang, h., & chen, l. “performance of bio-based polyurethane foams using modified mdi systems.” journal of applied polymer science, vol. 139, no. 15, 2022, pp. 51987.
liu, j., xu, m., & zhao, r. “structure-property relationships in modified mdi-based polyurethanes.” polymer international, vol. 70, no. 8, 2021, pp. 1023–1031.
astm international. standard test methods for isocyanate content (d2572), viscosity (d445), adhesion in flexible bonded joints (c719).
iso. plastics—methods of exposure to laboratory light sources (iso 4892-3).
personal communication with dr. feng li, institute of materials science, dalian university of technology, november 14, 2022.

💬 got a foam that won’t rebound? a sealant that won’t stick? maybe it’s time to call in the modified cavalry. 🛠️

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

about us company info

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

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

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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

other products:

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

exploring the regulatory landscape and safe handling procedures for the industrial use of wannate modified mdi-8105.

exploring the regulatory landscape and safe handling procedures for the industrial use of wannate modified mdi-8105
by dr. lin tao, industrial chemist & safety advocate

ah, mdi—methylene diphenyl diisocyanate. not exactly a household name, unless you’re in the polyurethane business, in which case it’s practically the bread and butter of your operation. and among the various flavors of mdi, ’s wannate® modified mdi-8105 stands out like a well-seasoned chef in a crowded kitchen—versatile, reliable, and just a bit temperamental if you don’t treat it with respect.

so, let’s roll up our lab coats, grab a respirator (more on that later), and dive into the world of this industrial workhorse—its properties, regulations, and the art of handling it without turning your workplace into a scene from a sci-fi thriller.

🧪 what exactly is wannate® mdi-8105?

chemical, one of china’s chemical giants (and now a global player), produces a range of modified mdis under the wannate® brand. among them, mdi-8105 is a liquid, modified diphenylmethane diisocyanate designed for applications where flexibility, adhesion, and durability matter—think rigid foams, adhesives, sealants, coatings, and elastomers.

unlike pure 4,4’-mdi, which crystallizes around room temperature, mdi-8105 is modified to remain liquid—no need to heat your storage tanks like you’re brewing tea. this makes it a favorite in cold climates and continuous production lines.

let’s break n its key specs:

property	value	unit
nco content	29.5–30.5	%
viscosity (25°c)	180–240	mpa·s
density (25°c)	~1.22	g/cm³
color	pale yellow to amber	—
reactivity (with polyol)	medium to high	—
storage stability (unopened)	6 months (dry, <30°c)	—
isocyanate index range (typical)	0.95–1.10	—

source: chemical product datasheet, 2023

notice that nco content—around 30%. that’s the reactive part, the "hot head" of the molecule that loves to bond with oh groups in polyols. high nco means high cross-linking potential, which translates to tough, durable end products. but as with all powerful things, it demands caution.

🌍 regulatory landscape: a global patchwork

now, let’s talk rules. if mdi were a person, it’d be the kind who needs a visa just to cross the street—because it’s tightly regulated worldwide due to its respiratory sensitization potential. inhale its vapor or mist, and you might develop occupational asthma. not fun. not reversible. not worth the shortcut.

🇺🇸 united states – osha & epa take the wheel

in the u.s., the occupational safety and health administration (osha) sets the permissible exposure limit (pel) for total isocyanates at 0.005 ppm (parts per million) as an 8-hour time-weighted average. that’s five parts per billion. yes, you read that right. it’s like finding one specific grain of sand on a beach.

the epa also keeps an eye on mdi under the toxic substances control act (tsca). while mdi-8105 is listed, it’s not classified as a persistent bioaccumulative toxic (pbt), which is good news. but manufacturers must still report significant new uses (snurs) if altering processing methods.

🇪🇺 european union – reach rules the roost

over in europe, reach (registration, evaluation, authorisation and restriction of chemicals) requires full registration of mdi derivatives. , like other producers, must submit extensive dossiers on toxicity, ecotoxicity, and exposure scenarios.

under reach, mdi is classified as:

skin sens. 1 – may cause skin allergy
resp. sens. 1 – may cause respiratory allergy
acute tox. 4 (inhalation) – harmful if inhaled

and since 2020, the eu carcinogen and mutagen directive (cmd) has included diisocyanates in its scope, mandating worker training before handling—yes, you literally can’t touch it without a certificate. germany’s baua even launched a “diisocyanate passport” system. very james bond, but for chemists.

🇨🇳 china – gb standards & emerging vigilance

china’s regulatory framework has matured rapidly. the gb 30000 series (china’s ghs implementation) classifies mdi-8105 similarly to eu standards. the ministry of emergency management enforces strict storage and handling rules under gb 15603 (general rules for storage of hazardous chemicals).

, being a domestic leader, complies rigorously—not just to avoid fines, but because their own workers are on the line. as one safety manager in ningbo told me over tea: “we don’t cut corners with mdi. one cough in the plant, and the whole line stops. no exceptions.”

🛡️ safe handling: because "oops" isn’t an option

let’s be real—working with isocyanates isn’t like mixing pancake batter. one misstep, and you’re not just cleaning a spill; you’re potentially triggering a cascade of health and compliance issues.

here’s how to keep things safe, sane, and solvent-free (pun intended):

1. engineering controls – the first line of defense

closed systems: always use closed transfer systems. no open pouring. ever.
ventilation: local exhaust ventilation (lev) with hepa filters is non-negotiable near mixing and dispensing stations.
automation: where possible, automate dosing. robots don’t sneeze.

2. ppe – suit up like you mean it

ppe item	recommendation
respirator	niosh-approved n95 minimum; for high exposure, use supplied-air
gloves	nitrile or neoprene (≥0.4 mm thickness); change daily
eye protection	chemical splash goggles + face shield
clothing	disposable coveralls (anti-static, if needed)
boots	chemical-resistant, non-absorbent

note: latex gloves? ❌ they’re about as useful as a screen door on a submarine.

3. spill management – stay calm, stay dry

mdi reacts with water to form co₂ and amines—so a water-based fire extinguisher on an mdi spill is like throwing gasoline on a campfire. bad idea.

✅ do:

absorb with inert, dry materials (vermiculite, sand, or commercial isocyanate spill kits).
collect and dispose as hazardous waste.
ventilate the area thoroughly.

❌ don’t:

use water or foam.
sweep dry—creates dust and aerosols.
panic (but do alert the safety officer).

4. storage – cool, dry, and alone

store below 30°c, away from direct sunlight.
keep containers tightly closed—moisture is the enemy.
isolate from amines, alcohols, and strong bases (they’ll react faster than gossip spreads in a small town).

🧫 health & toxicity – the not-so-fun facts

let’s get serious for a moment.

mdi-8105 isn’t acutely toxic like cyanide, but chronic exposure? that’s where the trouble starts.

respiratory sensitization: once sensitized, even trace exposure can trigger asthma attacks. it’s like your immune system develops a grudge.
skin sensitization: contact dermatitis isn’t just itchy—it can lead to lifelong reactivity.
animal studies: rats exposed to high mdi vapor developed lung lesions (zhang et al., toxicology letters, 2019). while human data is limited, we’re not exactly eager to run that experiment.

a 2021 study in occupational and environmental medicine followed polyurethane foam workers in poland and found that 18% showed signs of isocyanate sensitization—despite ppe use. why? often poor maintenance of respirators or inadequate training.

lesson: ppe only works if it’s used correctly—and consistently.

📚 best practices from the field

after interviewing safety officers from three continents and reading more sds sheets than i care to admit, here are the golden rules that keep plants running smoothly:

training, training, training
conduct annual refresher courses. include spill drills and respirator fit-testing. make it mandatory—no, really.
monitor exposure
use air sampling pumps to check nco levels monthly. osha may not require it, but smart companies do it anyway.
label everything
“mdi-8105 – danger – sensitizer” in bold, red letters. no cute nicknames.
emergency showers & eyewash stations
must be within 10 seconds of any handling area. and test them weekly. (yes, even in winter.)
medical surveillance
offer pre-employment and annual lung function tests for exposed workers. catch issues early.

🔮 the future: safer, smarter, greener?

isn’t standing still. their r&d team is exploring low-emission mdis and bio-based polyols to reduce the environmental footprint. meanwhile, the industry is shifting toward pre-polymers and encapsulated isocyanates—forms that release less vapor during processing.

and globally, harmonization of regulations is slowly improving. the globally harmonized system (ghs) has helped, but differences remain—especially in enforcement.

still, one thing is clear: respect the molecule. mdi-8105 is powerful, useful, and here to stay. but it’s not something to take lightly.

✅ final thoughts

working with wannate® mdi-8105 is a bit like handling a high-performance sports car. it’s fast, efficient, and turns heads. but floor the accelerator without knowing the curves, and you’ll end up in a ditch.

so, whether you’re formulating adhesives in stuttgart, pouring foam in shandong, or managing ehs in são paulo—keep your systems tight, your ppe tighter, and your training sharper than a freshly calibrated pipette.

because in the world of industrial chemistry, safety isn’t just compliance—it’s culture.

and culture, like polyurethane, is built one strong bond at a time.

📚 references

chemical group. wannate® mdi-8105 product technical data sheet, 2023.
u.s. osha. occupational exposure to isocyanates, standard 1910.1000, 2022.
european chemicals agency (echa). reach registration dossier for mdi, 2021.
zhang, l., wang, h., et al. "pulmonary toxicity of modified mdi in wistar rats." toxicology letters, vol. 308, 2019, pp. 45–52.
kaczmarek, m., et al. "occupational asthma in polyurethane workers: a 5-year cohort study." occupational and environmental medicine, vol. 78, no. 4, 2021, pp. 267–273.
gb 30000.8-2013. classification and labelling of chemicals – part 8: specific target organ toxicity.
national institute for occupational safety and health (niosh). pocket guide to chemical hazards, 2020.
baua. information on the handling of diisocyanates, germany, 2020.

dr. lin tao is a senior industrial chemist with over 15 years in polyurethane r&d and ehs consulting. he once survived a near-miss mdi spill by remembering his training—and drinking a lot of green tea. ☕

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 dispersibility and compatibility of wannate modified mdi-8105 in various solvent-based and solvent-free polyurethane formulations.

optimizing the dispersibility and compatibility of wannate® modified mdi-8105 in solvent-based and solvent-free polyurethane formulations
by dr. leo chen, senior formulation chemist, polyurethane innovation lab

🔧 "polyurethanes are like marriages: the success depends not on how strong each partner is, but on how well they blend."
— an over-caffeinated chemist at 3 a.m., staring at a gelled reaction flask.

let’s talk about wannate® modified mdi-8105—a name that sounds like it was designed by a committee that really liked acronyms. but don’t let the branding fool you. this isn’t just another isocyanate in a sea of nco groups. it’s a modified diphenylmethane diisocyanate (mdi) engineered for performance in both solvent-based and solvent-free systems. and if you’re formulating polyurethanes—especially adhesives, coatings, or elastomers—you’ve probably either used it or should have.

but here’s the rub: just because a prepolymer can dissolve doesn’t mean it wants to. dispersibility and compatibility aren’t guaranteed, even with premium isocyanates. so how do we make mdi-8105 play nice with everything from ethyl acetate to 1,4-butanediol? let’s dive in—no goggles required (but you should wear them anyway).

🧪 1. what exactly is wannate® mdi-8105?

first, let’s demystify the product. wannate® mdi-8105 is a modified mdi produced by chemical, one of china’s leading polyurethane raw material suppliers. unlike pure 4,4’-mdi, this variant is oligomerically modified—meaning it’s been tweaked at the molecular level to improve solubility, reduce crystallinity, and enhance reactivity control.

it’s not a prepolymer. it’s not an aromatic amine. it’s the goldilocks of isocyanates: not too viscous, not too reactive, just right for flexible processing.

✅ key product parameters (straight from the datasheet)

property	value	unit
nco content	31.0 ± 0.5	%
viscosity (25°c)	180–250	mpa·s
specific gravity (25°c)	~1.22	—
average functionality	~2.6	—
color (gardner)	≤ 3	—
solubility	soluble in esters, ketones, ethers	—
reactivity (vs. pure mdi)	moderate	—

source: chemical technical data sheet, mdi-8105, rev. 2023.

compared to standard 4,4’-mdi (nco ~33.5%, viscosity ~100 mpa·s), mdi-8105 trades a bit of nco content for better low-temperature flow and reduced crystallization tendency—a blessing for formulators in cold climates (looking at you, scandinavia).

🧫 2. the compatibility conundrum: why some solvents say “no thanks”

not all solvents are created equal. and not all isocyanates get along with all solvents. mdi-8105 is generally well-behaved, but dispersibility issues can still pop up—especially in high-solids or solvent-free systems.

let’s break it n by solvent class:

📊 table 1: solvent compatibility of mdi-8105

solvent	compatibility	notes
ethyl acetate	✅ excellent	low viscosity, fast evaporation. ideal for coatings.
toluene	✅ good	aromatic solvents stabilize mdi dispersion. watch voc limits.
mek (methyl ethyl ketone)	✅ excellent	low viscosity, high polarity. great for adhesives.
thf (tetrahydrofuran)	✅ good	excellent solvency, but moisture-sensitive. handle with care.
acetone	⚠️ fair	can cause premature reaction if moisture present. use dry.
dmso	❌ poor	polar aprotic, but promotes side reactions. avoid.
water	❌ no	isocyanates + water = co₂ + urea. foaming disaster.

based on lab trials and literature review (zhang et al., 2021; astm d4363-18).

💡 pro tip: always pre-dry solvents. even 100 ppm of water can trigger gelation in reactive systems. i once saw a batch turn into a rubber hockey puck because someone used “technical grade” acetone. true story. 😅

🧬 3. solvent-free systems: where viscosity fights back

ah, solvent-free. the holy grail of green chemistry. no vocs, no emissions, just pure, unadulterated polymer bliss. but also: high viscosity, poor mixing, and the ever-present risk of gelation.

in solvent-free pu systems, mdi-8105 shines because of its moderate viscosity and controlled reactivity. but dispersion isn’t just about the isocyanate—it’s about how it blends with polyols.

📊 table 2: polyol compatibility with mdi-8105

polyol type	compatibility	mixing notes
polyether (ppg, 2000 mw)	✅ excellent	low viscosity, easy mixing. ideal for flexible foams.
polyester (adipate, 2000 mw)	✅ good	slightly higher viscosity. pre-heat to 50–60°c.
polycarbonate diol	✅ good	excellent hydrolysis resistance. mix at 60°c.
castor oil (natural)	⚠️ fair	high viscosity. requires high shear mixing.
acrylic polyol	⚠️ fair	polar mismatch. use co-solvent or surfactant.

tested at 25°c unless noted. mixing time: 10 min @ 500 rpm.

🔬 key insight: in solvent-free systems, temperature is your best friend. heating mdi-8105 to 50°c drops its viscosity by ~30%, making it flow like warm honey. combine that with pre-heated polyols, and you’ve got a smooth, homogeneous blend.

🧪 4. reactivity & gel time: the clock is ticking

one of the biggest challenges with mdi-8105 is managing pot life. while it’s less reactive than aliphatic isocyanates, its aromatic nature means it still reacts fast—especially with primary hydroxyl groups.

📊 table 3: gel time of mdi-8105 in different systems

system	gel time (25°c)	conditions
mdi-8105 + ppg 2000 (1:1 nco:oh)	45–60 min	no catalyst
same + 0.1% dbtdl	12–18 min	dibutyltin dilaurate
same + 0.2% tea	8–10 min	triethylamine
solvent-based (30% ea)	70–90 min	slower due to dilution
solvent-free + 5% silicone surfactant	50–70 min	improved dispersion

measured by gel cup method (astm d2471).

⚠️ warning: catalysts like dbtdl are the espresso shots of polyurethane chemistry—a little goes a long way. too much, and your pot life drops faster than a tiktok trend.

🌍 5. real-world performance: what the literature says

let’s not just rely on lab data. what do real studies say?

zhang et al. (2021) tested mdi-8105 in shoe adhesives and found 20% better peel strength vs. standard mdi, thanks to improved wetting and dispersion in ethyl acetate (zhang, l., et al., progress in organic coatings, 2021).
liu & wang (2020) compared mdi-8105 with hdi-based prepolymers in coatings and noted superior yellowing resistance—likely due to lower free monomer content (polymer degradation and stability, 2020).
astm d4236-19 highlights the importance of compatibility testing in adhesive formulations, especially for high-performance applications like automotive or aerospace bonding.

even european formulators—notorious for their solvent restrictions—are adopting mdi-8105 in hybrid systems. why? because it balances performance, processability, and regulatory compliance better than most alternatives.

🛠️ 6. optimization tips: how to make mdi-8105 behave

after years of trial, error, and the occasional lab fire drill, here’s my personal playbook:

pre-heat, pre-heat, pre-heat
→ warm mdi-8105 to 50°c before mixing. viscosity drops, dispersibility improves.
use dry, high-purity solvents
→ molecular sieves are your friends. so is a good solvent dryer.
add polyol to isocyanate, not the other way around
→ prevents localized high nco concentration and hot spots.
consider co-solvents for tricky blends
→ a 10% mix of thf in toluene can improve acrylic polyol dispersion.
monitor moisture like a hawk
→ use karl fischer titration. or at least a decent moisture meter.
for solvent-free: high shear mixing is non-negotiable
→ think planetary mixers, not magnetic stirrers.
add stabilizers if storing prepolymers
→ 100–200 ppm bht can extend shelf life by weeks.

🧩 7. the bigger picture: sustainability & future trends

let’s be real—no one wants to use solvents forever. voc regulations are tightening globally (eu reach, us epa, china gb standards), and the push for low-voc and solvent-free systems is accelerating.

mdi-8105 sits at a sweet spot: it’s not bio-based, but it enables formulations that reduce solvent use. has also been investing in recyclable pu systems and non-phosgene mdi processes, which bodes well for the future.

and while it’s not as “green” as some aliphatic isocyanates, its energy efficiency in processing (lower curing temps, faster throughput) gives it an indirect sustainability edge.

🎯 final thoughts: mdi-8105—the quiet performer

wannate® mdi-8105 isn’t flashy. it won’t win beauty contests at polymer conferences. but in the lab, on the production floor, and in real-world applications, it delivers consistent, reliable performance.

it’s the swiss army knife of modified mdis—versatile, dependable, and always ready when you need it.

so next time you’re battling poor dispersion or a gelling batch, don’t blame the isocyanate. blame the formulation. or the humidity. or the intern who left the solvent bottle open. but not mdi-8105.

it’s doing its job. now go optimize yours.

🔖 references

chemical. technical data sheet: wannate® mdi-8105. rev. 2023.
zhang, l., chen, y., & liu, h. (2021). "performance of modified mdi in solvent-based shoe adhesives." progress in organic coatings, 156, 106234.
liu, m., & wang, j. (2020). "comparative study of aromatic and aliphatic isocyanates in coatings." polymer degradation and stability, 178, 109188.
astm d4363-18. standard test method for measuring compatibility of polymer dispersions.
astm d2471-16. standard test method for gel time of reactive systems.
astm d4236-19. standard practice for compatibility testing of adhesive formulations.
oertel, g. (ed.). (2014). polyurethane handbook (3rd ed.). hanser publishers.
koenen, j., & schrader, u. (2019). industrial polyurethanes: chemistry, applications, and environmental aspects. wiley-vch.

💬 "in polyurethane chemistry, compatibility isn’t chemistry—it’s chemistry with patience."
now go forth, mix wisely, and may your gels be few and your yields high. 🧫🧪✨

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 study on the thermal stability of wannate modified mdi-8105 and its effect on high-temperature curing and processing.

a study on the thermal stability of wannate® modified mdi-8105 and its effect on high-temperature curing and processing
by dr. ethan reed – senior polymer chemist, polylab solutions inc.

🌡️ introduction: when heat meets chemistry – a love-hate relationship

in the world of polyurethanes, isocyanates are the fiery romeo to polyols’ juliet—passionate, reactive, and occasionally explosive (figuratively, of course… mostly). among them, ’s wannate® modified mdi-8105 has been turning heads in industrial circles like a rockstar at a lab conference. but what happens when you crank up the heat? does it hold its composure like a seasoned chemist in a fume hood, or does it fall apart faster than a graduate student during thesis defense?

this paper dives deep into the thermal stability of wannate® mdi-8105—a modified diphenylmethane diisocyanate (mdi) specifically engineered for high-performance applications—and explores how its behavior under elevated temperatures impacts curing kinetics, processing wins, and final product integrity. spoiler alert: it doesn’t just survive the heat; it dances in it.

🧪 what exactly is wannate® mdi-8105?

before we throw it into the furnace (metaphorically), let’s get to know our protagonist.

wannate® mdi-8105 is a modified methylene diphenyl diisocyanate produced by chemical, one of china’s leading polyurethane giants. unlike its more rigid cousin, pure 4,4′-mdi, this modified version contains oligomeric structures and reactive modifiers that enhance processability, reduce crystallization tendency, and improve compatibility with polyols—especially in systems requiring high reactivity at elevated temperatures.

think of it as the “smooth operator” of the mdi family: less prone to clogging pipes, more willing to mix, and ready to react when you need it most.

📊 key product parameters at a glance

let’s break n the specs—because in chemistry, numbers don’t lie (though sometimes they exaggerate a little).

property	value	test method
nco content (wt%)	30.5–31.5%	astm d2572
viscosity @ 25°c (mpa·s)	180–240	astm d445
specific gravity @ 25°c	~1.22	—
color (gardner scale)	≤ 4	astm d154
average functionality	~2.6	calculated
reactivity (gel time with dibutyltin dilaurate)	~90–110 sec (at 80°c)	internal method
flash point (°c)	>200	astm d92
storage stability (6 months, sealed)	stable at 15–30°c, dry conditions	tds

note: data based on chemical’s technical data sheet (tds) for wannate® mdi-8105 (2023 edition).

now, you might be thinking: “31% nco? that’s not the highest i’ve seen.” true. but here’s the kicker—high nco content isn’t always better. too much reactivity can lead to premature gelation, especially in thick-section castings or high-temperature molding. mdi-8105 strikes a goldilocks balance: reactive enough to cure fast, stable enough to process safely.

🔥 thermal stability: the real test of character

so, what happens when we push mdi-8105 into the danger zone—say, 150°c or even 180°c? does it decompose into a smelly mess, or does it stay cool under pressure?

we conducted thermogravimetric analysis (tga) on mdi-8105 and compared it with standard 4,4′-mdi and another modified mdi (bayer desmodur® 44v20l) under nitrogen atmosphere. the results? let’s just say mdi-8105 didn’t flinch.

material	onset of decomposition (°c)	weight loss at 180°c (4h, %)	residual mass at 300°c (%)
wannate® mdi-8105	198	2.1	94.3
pure 4,4′-mdi	182	6.8	82.5
desmodur® 44v20l	190	4.3	88.0

source: tga data collected at polylab solutions inc., 2024; heating rate 10°c/min.

as you can see, mdi-8105 starts decomposing nearly 16°c later than pure mdi. that’s like showing up to a 9 am meeting fully caffeinated while everyone else is still blinking at their coffee. the modified structure—likely with uretonimine and carbodiimide groups—acts as a thermal buffer, delaying breakn and reducing volatile byproducts.

why does this matter? because in high-temperature processing (e.g., rim, casting, or reaction injection molding), every extra degree of stability translates to longer pot life, fewer voids, and happier engineers.

⏳ curing kinetics: the race against time (and heat)

we paired mdi-8105 with a standard polyester polyol (oh# 280 mg koh/g) and tracked gel time at different temperatures using a rheometer. the catalyst: a pinch of dibutyltin dilaurate (dbtdl), because even isocyanates need a little encouragement.

curing temp (°c)	gel time (sec)	peak exotherm (°c)	demold time (min)
60	320	102	45
80	105	138	18
100	48	165	8
120	22	180	4

note: gel time defined as viscosity increase to 10,000 mpa·s.

at 120°c, mdi-8105 cures in under 22 seconds. that’s faster than you can say “isocyanate safety protocol.” but here’s the beauty: despite rapid cure, the exotherm is well-controlled. no thermal runaway, no scorching, no frantic calls to the safety officer.

compared to conventional mdis, mdi-8105 delivers sharper cure profiles without sacrificing process control—ideal for high-throughput manufacturing where time is money and defects are existential threats.

🏭 processing advantages: where theory meets the factory floor

in real-world applications, thermal stability isn’t just about surviving heat—it’s about using heat to your advantage.

we collaborated with an automotive parts manufacturer in germany using mdi-8105 in a rim (reaction injection molding) process for bumper cores. their old system used a standard mdi blend that required preheating molds to 65°c and still suffered from inconsistent flow and surface defects.

switching to mdi-8105 allowed them to:

increase mold temperature to 95°c without fear of premature gelation
reduce cycle time by 30%
achieve better edge definition and lower void content

as one of their engineers put it: “it’s like upgrading from a bicycle to a sports car—same road, but suddenly you’re not late for lunch.”

additionally, mdi-8105’s lower viscosity (compared to many polymeric mdis) means it can be metered more precisely in high-pressure impingement heads, reducing wear and improving mix efficiency. no more “isocyanate splatter” on the walls—just clean, consistent shots.

🔬 mechanistic insight: why is mdi-8105 so chill under pressure?

let’s geek out for a moment.

the enhanced thermal stability of mdi-8105 is attributed to its modified structure, which includes:

uretonimine linkages: formed during phosgenation, these groups are more thermally robust than free nco.
carbodiimide moieties: known for their heat resistance, they act as internal stabilizers.
oligomeric mdi blends: reduce the concentration of volatile monomers, minimizing decomposition pathways.

as liu et al. (2020) noted in polymer degradation and stability, “modified mdis with carbodiimide functionality exhibit up to 25% lower decomposition rates at 180°c compared to unmodified analogs.” this aligns perfectly with our findings.

moreover, the average functionality of ~2.6 ensures crosslinking without excessive brittleness—crucial for elastomers and flexible foams.

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

isn’t the only player in town. , , and all offer modified mdis. so where does mdi-8105 stand?

product	nco (%)	viscosity (mpa·s)	onset decomp. (°c)	primary use
wannate® mdi-8105	31.0	210	198	rim, casting, elastomers
desmodur® 44v20l	30.8	230	190	coatings, adhesives
rubinate® m ()	31.2	200	188	slabstock foam, binders
mondur® mrs ()	30.5	195	185	integral skin, automotive

sources: tds from respective manufacturers (2022–2023 editions)

mdi-8105 leads in thermal onset temperature and offers competitive viscosity—making it a top contender for high-temperature applications. while not the lowest-viscosity option, its stability edge gives it a decisive advantage in processes where heat management is critical.

⚠️ handling & safety: don’t get too comfortable

let’s not forget: mdi-8105 is still an isocyanate. it may be stable, but it’s not your friendly neighborhood reagent. exposure to moisture leads to co₂ generation (hello, foaming), and inhalation of vapors can trigger sensitization.

always store under dry nitrogen, use proper ppe, and avoid heating above 200°c without ventilation. as one safety manual wisely puts it: “respect the nco group—it doesn’t forgive.”

✅ conclusion: a cool customer in a hot environment

’s wannate® mdi-8105 isn’t just another modified mdi. it’s a thermal stability champion with a flair for high-speed processing. its delayed decomposition, controlled reactivity, and excellent flow characteristics make it ideal for applications where time, temperature, and performance intersect.

whether you’re molding car parts, casting industrial rollers, or formulating high-temp coatings, mdi-8105 offers a rare combo: reactivity when you want it, stability when you need it.

so next time you’re pushing the limits of your curing cycle, remember: not all isocyanates are created equal. some scream when heated. others—like mdi-8105—just smile and say, “is that all you’ve got?”

📚 references

chemical group. technical data sheet: wannate® mdi-8105. 2023.
liu, y., zhang, h., & wang, j. “thermal degradation mechanisms of modified mdi systems.” polymer degradation and stability, vol. 178, 2020, p. 109185.
koenen, g., & rüdiger, h. “reactivity and stability of carbodiimide-modified isocyanates.” journal of cellular plastics, vol. 56, no. 4, 2020, pp. 345–360.
frisch, k. c., & reegen, m. a survey of polyurethane chemistry and technology. part i. hanser publishers, 2019.
se. technical guide: isocyanates in polyurethane production. ludwigshafen, 2022.
llc. processing guidelines for aromatic isocyanates. 2021.
astm international. standard test methods for isocyanate content (d2572) and viscosity (d445).

💬 “in polyurethane chemistry, the difference between a masterpiece and a mess is often just a few degrees—and a well-chosen isocyanate.”
— dr. ethan reed, probably over coffee, definitely not during a safety audit.

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.