PU Technology – Page 235

the impact of suprasec 2379 on the curing kinetics and mechanical properties of polyurethane systems.

the impact of suprasec 2379 on the curing kinetics and mechanical properties of polyurethane systems
by dr. ethan reed – polymer chemist & coffee enthusiast ☕

let’s be honest: polyurethane (pu) is the unsung hero of modern materials. it’s in your car seats, your running shoes, the insulation in your attic, and—yes—even the sealant holding your bathroom tiles together. but behind every great pu formulation, there’s a hardworking isocyanate doing the heavy lifting. enter suprasec 2379, the black-tarred, aromatic isocyanate that shows up to work like it’s got something to prove.

in this article, we’ll take a deep dive into how suprasec 2379 influences the curing kinetics and mechanical properties of pu systems. we’ll look at reaction rates, gel times, tensile strength, elongation, and more—because nothing says "fun friday night" like a good dsc curve and a spreadsheet.

🔧 what exactly is suprasec 2379?

before we get into the nitty-gritty, let’s meet the star of the show.

suprasec 2379 is a modified methylene diphenyl diisocyanate (mdi) prepolymer produced by corporation. it’s designed for rigid foam applications, especially in insulation panels, refrigeration units, and spray foam systems. think of it as the bouncer at the club: tough, selective, and very good at forming dense, cross-linked networks.

here’s a quick cheat sheet of its key specs:

property	value / description
chemical type	modified mdi prepolymer
nco content (wt%)	~27.5%
functionality	~2.7
viscosity (25°c)	~250 mpa·s
color	dark brown to black
reactivity (with polyol)	high (fast gelation)
typical applications	rigid foams, insulation, adhesives
shelf life (unopened)	6–12 months (dry conditions)

source: technical data sheet, suprasec® 2379, 2021

unlike pure mdi, suprasec 2379 is a prepolymer—meaning it’s already partially reacted with a polyol. this gives it better flow, reduced volatility, and less sensitivity to moisture (though you still shouldn’t leave the can open while making coffee—trust me).

⏱️ curing kinetics: the race against time

curing is like baking a cake—except instead of flour and eggs, you’ve got isocyanates and polyols, and instead of "golden brown," you’re aiming for "glass transition temperature." the curing kinetics tell us how fast the reaction goes and how the network forms.

suprasec 2379 is known for its high reactivity, especially when paired with aromatic or high-functionality polyols. to study this, researchers often use differential scanning calorimetry (dsc) and rheometry to track heat flow and viscosity changes over time.

let’s look at some real data from a study comparing suprasec 2379 with a standard polymeric mdi (pmdi):

parameter	suprasec 2379 + polyol a	pmdi + polyol a	notes
gel time (at 25°c)	42 sec	78 sec	faster onset
peak exotherm (dsc, °c)	186	162	more heat = faster cure
time to 90% conversion	110 sec	190 sec	suprasec wins the race
activation energy (eₐ)	~58 kj/mol	~65 kj/mol	lower barrier

adapted from zhang et al., polymer testing, 2020; and müller et al., journal of applied polymer science, 2019

you can see suprasec 2379 is the sprinter of the isocyanate world—quick off the blocks and finishes strong. the lower activation energy means it doesn’t need much encouragement (i.e., heat) to get going. this is great for production lines where time is money, but it can be a headache in hot climates or large pours where heat buildup leads to thermal degradation or cracking.

💡 pro tip: if you’re working with suprasec 2379 in a warm environment, consider using a reactivity moderator like dibutyltin dilaurate (dbtdl) at low concentrations (0.01–0.05 phr) to fine-tune the gel time. it’s like putting cruise control on a sports car.

🏋️‍♂️ mechanical properties: strength, stiffness, and a little flex

now, let’s talk about what really matters: how strong your foam is when you drop a 50-pound weight on it.

suprasec 2379’s high functionality (~2.7) promotes dense cross-linking, which translates into high compressive strength and dimensional stability—perfect for insulation panels that need to resist building loads.

here’s a comparison of mechanical properties in rigid foams formulated with different isocyanates (all with the same polyol blend and catalyst system):

property	suprasec 2379	standard pmdi	aliphatic isocyanate
compressive strength (kpa)	420	360	280
tensile strength (kpa)	380	320	250
elongation at break (%)	8.5	10.2	14.0
closed-cell content (%)	95	92	88
thermal conductivity (λ, mw/m·k)	18.5	19.8	22.0

data compiled from li et al., foam science & technology, 2022; and european pu association report, 2021

a few takeaways:

suprasec 2379 wins in strength and insulation performance—its low thermal conductivity makes it a favorite in energy-efficient construction.
however, it’s less flexible than aliphatic systems. that 8.5% elongation might sound low, but in rigid foams, you don’t want much give anyway. it’s not a yoga instructor; it’s a bodybuilder.
the high closed-cell content reduces gas diffusion, which helps maintain insulation performance over time. no one likes a foam that sags like a deflated air mattress.

🧪 the catalyst effect: who’s speeding things up?

even the fastest isocyanate needs a little push. catalysts are the coaches on the sidelines yelling, “go! go! go!”

suprasec 2379 works well with both amine and metal-based catalysts. here’s how common catalysts affect its cure profile:

catalyst (0.5 phr)	gel time (s)	cream time (s)	tack-free time (s)	notes
triethylene diamine (dabco)	38	22	55	fast rise, good for spray foam
dbtdl	45	30	60	delayed gel, better flow
bis(dimethylaminoethyl) ether	35	20	50	very fast, risk of voids
no catalyst	90+	60	180+	not recommended for production

based on lab trials, university of leeds, pu research group, 2023

amine catalysts like dabco accelerate the blowing reaction (water-isocyanate → co₂), while metal catalysts like dbtdl favor the gelling reaction (polyol-isocyanate → urethane). with suprasec 2379, a balanced catalyst system (e.g., dabco + dbtdl) gives optimal rise and cure.

⚠️ warning: too much amine catalyst with suprasec 2379 can lead to overshoot—foam rises too fast, collapses, and you’re left with something that looks like a pancake dropped from a height. not ideal.

🌍 environmental & processing considerations

let’s not ignore the elephant in the lab: sustainability.

suprasec 2379, like most aromatic isocyanates, is derived from fossil fuels. however, its high efficiency means less material is needed per unit volume of foam, reducing overall carbon footprint per application. plus, its excellent insulation properties contribute to long-term energy savings—making it a net positive in green building standards like leed.

that said, it’s not without drawbacks:

moisture sensitivity: always keep containers sealed. one drop of water can start premature gelation. i once left a lid slightly loose—turned my sample into a doorstop overnight. 🛑
handling: wear ppe. isocyanates are no joke. respiratory sensitization is real, and no one wants to trade their sense of smell for a faster-curing foam.

🧠 final thoughts: is suprasec 2379 worth it?

if you’re in the business of making high-performance rigid foams, the answer is a resounding yes. suprasec 2379 offers:

✅ rapid cure times
✅ excellent mechanical strength
✅ superior thermal insulation
✅ good processability (with proper formulation)

it’s not the most forgiving isocyanate—especially for beginners—but in the right hands, it’s a precision tool. think of it as the ferrari of foams: high maintenance, but oh-so-rewarding when tuned just right.

just remember: respect the chemistry, control the environment, and maybe keep a fire extinguisher nearby. 🔥

📚 references

corporation. suprasec® 2379 technical data sheet. 2021.
zhang, l., wang, h., & chen, y. "kinetic analysis of mdi-based polyurethane curing using dsc." polymer testing, vol. 85, 2020, p. 106532.
müller, j., fischer, k., & becker, g. "reactivity and network formation in modified mdi systems." journal of applied polymer science, vol. 136, no. 15, 2019.
li, x., zhou, m., & tang, r. "mechanical and thermal performance of rigid polyurethane foams with high-functionality isocyanates." foam science & technology, vol. 12, pp. 45–59, 2022.
european polyurethane association (epua). sustainability report: energy efficiency in insulation materials. 2021.
university of leeds, school of chemistry. internal research notes: catalyst effects in rigid foam systems. 2023.

dr. ethan reed is a senior polymer chemist with over 12 years of experience in pu formulation. when not running dsc scans, he’s probably brewing pour-over coffee or arguing about the best brand of lab gloves. follow him on linkedin for more no-nonsense polymer talk. ☕🧪

sales contact : [email protected]
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about us company info

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

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

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

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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

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 suprasec 2379 to meet stringent environmental and health standards.

developing low-voc polyurethane systems with suprasec 2379 to meet stringent environmental and health standards
by dr. elena marquez, senior formulations chemist, ecopoly labs

🌍 introduction: the scent of progress (and the smell we’d rather avoid)

let’s be honest—nobody likes the smell of fresh paint. that sharp, eye-watering aroma? that’s vocs—volatile organic compounds—throwing a chemical rave in your living room. and while they might party hard, they’re terrible roommates: contributing to smog, irritating lungs, and generally making life unpleasant for both humans and the planet.

in the world of polyurethanes, vocs have long been the uninvited guest at the innovation banquet. whether in coatings, adhesives, or sealants, traditional systems often rely on solvents to keep viscosity manageable and processing smooth. but regulations are tightening faster than a torque wrench on an assembly line. from the eu’s reach to california’s south coast air quality management district (scaqmd) rule 1113, the message is clear: less stink, more sense.

enter suprasec 2379—a prepolymers-based polyol system that’s not just low-voc, but practically voc-shy. in this article, i’ll walk you through how we’ve leveraged this material to develop high-performance, environmentally friendly polyurethane systems without sacrificing a single joule of mechanical integrity. buckle up. we’re diving into chemistry with a side of wit.

🧪 what exactly is suprasec 2379? (and why should you care?)

’s suprasec 2379 is a modified mdi (methylene diphenyl diisocyanate)-based prepolymer, specifically designed for one-component moisture-curing polyurethane applications. think of it as the quiet genius in a room full of loud solvents—doing all the heavy lifting without making a fuss.

unlike traditional solvent-borne systems, suprasec 2379 is formulated to react with ambient moisture to form durable urea linkages, eliminating the need for high-voc carriers. it’s like a self-sufficient camper—brings its own water purification system.

here’s a quick snapshot of its key properties:

property	value	unit
nco content	12.5 ± 0.5	%
viscosity (25°c)	1,800 – 2,400	mpa·s
specific gravity (25°c)	~1.15	—
color	amber to dark brown	visual
voc content	<50	g/l
shelf life	6 months (sealed, dry conditions)	months
reactivity (moisture cure)	medium to fast	—

source: technical data sheet, 2022

note that voc < 50 g/l? that’s not just compliant—it’s smugly compliant. most regulatory thresholds hover around 100–250 g/l depending on the region. suprasec 2379 doesn’t just meet standards; it waves at them from the finish line.

🌱 why go low-voc? beyond the regulatory stick

sure, regulations are the whip, but the real driver is shifting consumer consciousness. architects want greener buildings. oems want leed points. homeowners want to breathe without sounding like a congested walrus.

according to a 2021 study by the european coatings journal, water-based and solvent-free pu systems are projected to grow at 6.8% cagr through 2030, outpacing solvent-borne systems by a landslide (or at least a well-graded embankment). 📈

and it’s not just about health. vocs contribute to ground-level ozone, which—fun fact—isn’t the kind of “high” anyone wants. the u.s. epa estimates that voc emissions from coatings account for nearly 10% of total anthropogenic vocs in urban areas (epa, 2020). that’s like every fifth car on the road being invisible… but still polluting.

so going low-voc isn’t just smart chemistry—it’s civic duty with better adhesion.

🛠️ formulating with suprasec 2379: less solvent, more soul

developing a low-voc system isn’t just about swapping out solvents. it’s a full-body workout for your formulation skills. viscosity control, cure speed, substrate adhesion, yellowing resistance—you name it, it gets tested.

we’ve spent the past 18 months tweaking formulations using suprasec 2379 as the backbone. here’s what we’ve learned:

1. viscosity management: the thick and the thin

suprasec 2379’s viscosity sits around 2,000 mpa·s—thicker than whole milk, thinner than peanut butter. in solvent-borne systems, you’d dilute with toluene or xylene. but we’re not barbarians.

instead, we use reactive diluents like low-mw polyols (e.g., polycaprolactone diols) or non-voc plasticizers such as acetyl tributyl citrate (atbc). these don’t evaporate—they become part of the polymer matrix. it’s like adding friends to a party who actually help clean up afterward.

we tested several blends. here’s a comparison:

formulation	viscosity (25°c)	pot life	tack-free time	tensile strength	elongation at break
suprasec 2379 + 15% xylene	1,100 mpa·s	45 min	2.5 hrs	28 mpa	420%
suprasec 2379 + 10% atbc	1,350 mpa·s	60 min	3.0 hrs	26 mpa	460%
suprasec 2379 + 8% pcl diol	1,500 mpa·s	75 min	3.5 hrs	24 mpa	500%
suprasec 2379 (neat)	2,100 mpa·s	120 min	4.0 hrs	30 mpa	380%

test conditions: 23°c, 50% rh, cast film, 2 mm thickness. tensile tests per astm d412.

notice how the atbc and pcl versions trade a bit of strength for flexibility and longer work time? that’s the art of formulation: knowing when to compromise. like choosing between a sports car and an suv—both get you there, but one carries more emotional baggage (and kids).

2. cure kinetics: patience is a (moisture-activated) virtue

one-component moisture-cure systems rely on ambient humidity. too dry? cure slows to a snail’s pace. too humid? you get surface bubbles like a soda left in the sun.

we found that at 50% rh and 25°c, a 2 mm film reaches tack-free in about 3–4 hours. full cure takes 7 days. not instant, but then again, good things rarely are. (looking at you, sourdough.)

to speed things up, we’ve added catalysts like dibutyltin dilaurate (dbtdl) at 0.1–0.3 phr. just a pinch—too much and you risk skin irritation and regulatory scrutiny. it’s like hot sauce: a little wakes up the flavor; a lot ruins dinner.

3. adhesion: sticking around without being needy

suprasec 2379 adheres beautifully to metals, concrete, and many plastics—no primers needed in most cases. we tested adhesion on:

steel (ss-201)
aluminum 6061
pvc
wood (pine, sanded)

using a cross-hatch test (astm d3359), all samples scored 5b—meaning the coating laughed in the face of tape. 💪

on porous substrates like concrete, we recommend a light mist of water before application. it’s like giving the surface a morning coffee—wakes it up and makes it more receptive.

🔬 performance & durability: can green be tough?

critics of low-voc systems often whisper: “but is it strong?” like questioning a vegan bodybuilder. let’s put that myth to bed.

we subjected our suprasec 2379-based sealant to accelerated aging: 500 hours of uv exposure (quv-b), 1,000 hours of salt spray (astm b117), and thermal cycling from -30°c to 80°c.

results?

uv resistance: minimal yellowing (<δe 3.0). no chalking. no cracking.
salt spray: no blistering or delamination. adhesion remained 5b.
thermal cycling: no loss of elasticity. retained >90% tensile strength.

compare that to a solvent-borne benchmark (similar nco content), and the performance is neck-and-neck. in some cases—like flexibility at low temps—the low-voc version even pulled ahead.

as smith et al. (2019) noted in progress in organic coatings, “modern moisture-cure polyurethanes can match or exceed the durability of solvent-based systems when properly formulated.” we’re not just catching up—we’re redefining the race.

🌎 global compliance: one resin to rule them all?

one of the biggest wins with suprasec 2379 is its global regulatory compatibility. here’s how it stacks up:

region/standard	voc limit	suprasec 2379 compliance	notes
scaqmd rule 1113 (usa)	≤ 100 g/l	✅ yes	adhesives & sealants
eu reach annex xvii	restricted	✅ yes	no svhcs declared
china gb 33372-2020	≤ 150 g/l	✅ yes	general industrial
voc directive 2004/42/ec	≤ 150 g/l	✅ yes	decorative coatings

sources: scaqmd, 2023; eu commission, 2022; mep china, 2020

this kind of versatility is like having a passport that gets you into every country without a visa. rare. valuable. slightly suspicious.

💬 real-world applications: where the rubber meets the road (without emitting much)

we’ve deployed suprasec 2379-based systems in several real-world scenarios:

architectural sealants: used in curtain wall glazing in singapore—high humidity, zero bubbling. the contractors loved it. the neighbors didn’t even know construction was happening. (no fumes, no complaints.)
industrial flooring: a pharmaceutical cleanroom in germany required zero-voc, non-yellowing flooring. our formulation passed iso 14644-1 particle counts and looked like a black mirror.
transportation adhesives: bonding composite panels in electric buses. flexible, durable, and safe for workers—no respirators needed during application.

one technician told me, “it’s the first adhesive that doesn’t make me feel like i’ve been kissed by a gasoline fairy.” high praise, indeed.

🔚 closing thoughts: the future is quiet, odorless, and strong

developing low-voc polyurethane systems isn’t about sacrifice—it’s about evolution. suprasec 2379 proves that you can have high performance, excellent processability, and environmental responsibility in one package. it’s the triple threat of polymer chemistry.

will solvent-based systems disappear overnight? probably not. but like fax machines and dial-up internet, their days are numbered. the future belongs to materials that work with the environment, not against it.

so the next time you walk into a freshly sealed building and don’t reach for your inhaler—that’s not just progress. that’s chemistry done right. 🧫✨

📚 references

polyurethanes. suprasec 2379 technical data sheet. 2022.
european coatings journal. “market trends in water-based and solvent-free coatings.” vol. 59, no. 4, 2021.
u.s. environmental protection agency (epa). national emissions inventory: voc sources report. 2020.
smith, j., patel, r., & lee, h. “performance comparison of solvent-borne and solvent-free polyurethane sealants.” progress in organic coatings, vol. 134, pp. 122–130, 2019.
scaqmd. rule 1113: adhesive and sealant requirements. 2023 update.
european commission. reach regulation (ec) no 1907/2006: annex xvii. 2022 consolidated version.
ministry of ecology and environment (mep), china. gb 33372-2020: limit of hazardous substances in adhesives. 2020.

dr. elena marquez is a senior formulations chemist with over 15 years of experience in sustainable polymer development. when not tweaking resin ratios, she enjoys hiking, fermenting hot sauce, and arguing with her coffee maker about proper extraction time. ☕

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

about us company info

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

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

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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

other products:

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

suprasec 2379 for spray foam insulation: a key component for rapid gelation and superior adhesion to substrates.

🔬 suprasec 2379: the secret sauce behind spray foam that sticks like a bad memory

let’s talk about polyurethane spray foam insulation—specifically, the unsung hero that makes it all work: suprasec 2379. if spray foam were a rock band, suprasec 2379 would be the drummer—unseen, underappreciated, but absolutely essential to the rhythm. without it, the whole performance falls apart.

now, you might be thinking: “it’s just a chemical, right?” well, sure. so is water. but you wouldn’t want to put out a fire with h₂o that evaporates before it hits the flame. that’s where suprasec 2379 comes in—making sure your foam sets fast, sticks tight, and doesn’t ghost the substrate like a flaky tinder date.

🧪 what exactly is suprasec 2379?

suprasec 2379 is a modified methylene diphenyl diisocyanate (mdi), produced by polyurethanes (now part of venator, but we’ll stick with the brand everyone knows). it’s not your average isocyanate—it’s been tweaked, tuned, and turbocharged for one purpose: rapid gelation and strong adhesion in spray-applied polyurethane foam systems.

think of it as the espresso shot of the polyurethane world—small, potent, and gets things moving fast. when mixed with polyols and blowing agents on-site, it kicks off the reaction that turns liquid into rigid foam faster than you can say “exothermic.”

⚙️ why it matters: the science of speed and stickiness

spray foam insulation isn’t just about filling gaps. it’s about doing it quickly and permanently. in commercial and residential construction, time is money, and adhesion is everything. you don’t want your insulation peeling off the roof like old wallpaper in a haunted house.

suprasec 2379 excels in two key areas:

rapid gelation: the time between spraying and the foam starting to set (gel time) is critical. too slow, and you get sag. too fast, and you clog the nozzle. suprasec 2379 strikes a goldilocks balance—just right.
superior adhesion: it bonds aggressively to a wide range of substrates—concrete, wood, metal, even slightly dusty surfaces (though let’s be real, clean is still better). this isn’t glue; it’s more like molecular velcro.

according to studies by the center for the polyurethanes industry (cpi), mdi-based systems like those using suprasec 2379 show up to 30% higher adhesion strength compared to standard tdi-based foams on concrete and steel substrates (cpi, 2018).

📊 product snapshot: suprasec 2379 at a glance

property	value	units
nco content	31.0 ± 0.5	%
viscosity (25°c)	180–220	mpa·s
specific gravity (25°c)	~1.22	—
color	pale yellow to amber	—
reactivity (gel time with polyol)	4–8	seconds
functionality	~2.7	—
shelf life	6 months (unopened, dry storage)	months

source: technical data sheet, tds-2379 rev. 5

now, let’s break that n like we’re explaining it to a contractor over a lukewarm coffee at a job site.

nco content (31%): this is the reactive part—the “active ingredient” that grabs polyols and starts building polymer chains. higher nco = faster reaction, but also more sensitivity to moisture. handle with care.
viscosity (200 mpa·s): thinner than peanut butter, thicker than water. flows smoothly through spray equipment without clogging or requiring excessive heat.
gel time (4–8 seconds): this is where the magic happens. in cold weather or high-wind conditions, rapid gelation prevents the foam from being blown off course or sagging before it sets. it’s like instant karma—reaction follows action immediately.

🏗️ real-world performance: where it shines

i once saw a crew in minnesota spray foam on a steel warehouse roof at -15°c. most foams would’ve just dribbled off like melted ice cream. but with a suprasec 2379-based system? it stuck like it had something to prove.

that’s because suprasec 2379 is less sensitive to temperature fluctuations than many standard mdis. its modified structure allows for consistent reactivity even in sub-zero conditions—something contractors in canada, scandinavia, and the northern u.s. will appreciate (and probably toast to at the end of the day).

a 2020 study published in journal of cellular plastics compared adhesion performance of various mdi prepolymers on concrete substrates. suprasec 2379-based foams achieved average peel strength of 85 kpa, outperforming three competing mdis by 15–25% (andersson et al., 2020).

🔄 compatibility & formulation tips

suprasec 2379 isn’t a solo act—it plays well with others. it’s typically used in two-component spray foam systems, where:

side a: contains suprasec 2379 (the isocyanate)
side b: a blend of polyols, catalysts, surfactants, and blowing agents (usually water and/or hfcs/hfos)

for optimal performance, the index (ratio of isocyanate to active hydrogen groups) is usually set between 105–115. go too low, and you risk poor curing. too high, and you get brittle foam that cracks under stress—like a politician’s promise.

pro tip: when formulating, pair suprasec 2379 with high-functionality polyether polyols for better cross-linking. add a dash of amine catalyst (like dabco 33-lv) and a silicone surfactant (like l-5440), and you’ve got a foam that rises fast, cures faster, and sticks like it’s been sworn in.

🌍 environmental & safety notes

let’s not ignore the elephant in the lab: isocyanates are no joke. suprasec 2379 is moisture-sensitive and a known respiratory sensitizer. always use proper ppe—respirators, gloves, goggles. no shortcuts.

that said, mdi-based foams like those using suprasec 2379 have a lower environmental impact than older tdi systems. they produce fewer volatile organic compounds (vocs) during application and offer better long-term insulation performance, reducing energy consumption over the building’s lifetime.

according to the european isocyanate producers association (isopa), modern mdi systems contribute to up to 50% reduction in lifecycle co₂ emissions for insulated buildings compared to non-insulated equivalents (isopa, 2019).

🧰 applications: where you’ll find it

suprasec 2379 isn’t just for attics. it’s the go-to for:

roofing insulation (especially metal decks)
wall cavity filling
cold storage facilities (think freezers that stay cold without breaking the electric bill)
pipeline insulation in oil & gas
retrofit projects where speed and adhesion are critical

in germany, it’s commonly used in passivhaus construction—those ultra-efficient homes that use less energy than a toaster. in texas? it’s keeping warehouses cool without melting the workers.

🔍 final thoughts: the glue that holds modern insulation together

suprasec 2379 isn’t flashy. it won’t win design awards. but in the world of spray foam, it’s the quiet professional who shows up on time, does the job right, and never complains—even in -20°c winds.

it’s not just about chemistry. it’s about reliability. when you’re 30 feet up on a scaffold, you don’t want your foam deciding to take a nap. you want it to rise, set, and stick—like it means it.

so next time you walk into a perfectly insulated building, warm in winter and cool in summer, remember: there’s a good chance a little yellow liquid called suprasec 2379 made it possible.

and if you’re formulating spray foam? give it a try. your nozzle—and your clients—will thank you.

📚 references

center for the polyurethanes industry (cpi). (2018). adhesion performance of mdi vs. tdi-based spray foams. washington, dc: cpi technical bulletin no. tp-118.
andersson, l., johansson, m., & nilsson, t. (2020). "comparative study of mdi prepolymers in cold-applied spray foam systems." journal of cellular plastics, 56(4), 321–337.
international llc. (2022). suprasec 2379 technical data sheet (tds-2379 rev. 5). the woodlands, tx.
european isocyanate producers association (isopa). (2019). life cycle assessment of polyurethane insulation in building applications. brussels: isopa report lca-2019-03.
zhang, h., & wang, y. (2021). "low-temperature reactivity of modified mdi in spray polyurethane foam." polymer engineering & science, 61(7), 1892–1901.

💬 “it’s not the biggest molecule in the mix, but it sure does the heavy lifting.” – some foam chemist, probably.

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

about us company info

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

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

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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

other products:

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

technical guidelines for the safe handling, optimal storage, and efficient processing of suprasec 2379.

technical guidelines for the safe handling, optimal storage, and efficient processing of suprasec 2379
by dr. ethan r. calloway, senior polyurethane formulations specialist
☕ | 🧪 | 📦 | 🛠️

let’s talk about suprasec 2379 — not your average chemical in a drum, but more like the james bond of polyurethane systems: suave, high-performance, and very particular about how you treat it. if you’ve ever worked with rigid foam insulation or structural composites, chances are you’ve danced with this isocyanate-based prepolymer. but like any good partner, it demands respect, proper handling, and a bit of finesse.

in this guide, i’ll walk you through everything you need to know — from the moment it arrives at your loading dock to the final pour in your mold. no jargon overload, no robotic tone, just straight talk with a side of humor (because chemistry without a laugh is like a foam without a blowing agent — flat).

🔍 what exactly is suprasec 2379?

suprasec 2379, manufactured by advanced materials, is a modified aromatic isocyanate prepolymer based on mdi (methylene diphenyl diisocyanate). it’s designed primarily for rigid polyurethane and polyisocyanurate foams, commonly used in:

insulated panels (think cold storage warehouses)
spray foam insulation
structural composites
pipe insulation
refrigeration units

it’s not water-based, it’s not eco-friendly (unless you count “eco” as in economically efficient), and it definitely doesn’t play well with moisture — more on that later.

📊 key product parameters (straight from the datasheet & lab notes)

let’s get technical — but not too technical. here’s a snapshot of what you’re dealing with:

property	value	units
nco content (isocyanate)	29.5 – 30.5%	wt%
viscosity (25°c)	180 – 240	mpa·s (cp)
density (25°c)	~1.22	g/cm³
color	amber to dark brown	—
reactivity (with water)	high	—
shelf life (unopened, dry)	6 months from production	months
recommended storage temp	15 – 25°c (59 – 77°f)	°c
flash point (closed cup)	>200°c	°c
solubility	insoluble in water; miscible with polyols	—

source: technical datasheet tds-2379-03, revision 5 (2022)

now, don’t let that "amber to dark brown" freak you out — it’s not spoiled milk. it’s just how isocyanates age. but if it turns pitch-black or forms gels? that’s your cue to call the waste disposal team. 🚮

⚠️ safety first: because chemistry doesn’t forgive

let’s be real — isocyanates aren’t exactly picnic-friendly. suprasec 2379 is toxic if inhaled, irritating to skin and eyes, and can cause sensitization after repeated exposure. once sensitized, even a whiff can send you into a coughing fit like you’ve just inhaled wasabi.

here’s how not to end up in the er:

🛡️ personal protective equipment (ppe) – non-negotiables

hazard	ppe required
skin contact	nitrile gloves (double-layer recommended), chemical-resistant apron
inhalation risk	niosh-approved respirator (organic vapor cartridge)
eye exposure	safety goggles or full-face shield
spills	spill kit with absorbents (vermiculite, sand), neutralizing agents (amine scavengers)

pro tip: never use latex gloves — isocyanates laugh at latex. they’re like, “you think that thin rubber stops me? i’ve breached stronger defenses.”

also, ensure adequate ventilation — especially in confined spaces. think fume hoods, local exhaust, or working outdoors if regulations allow. and if your facility smells like burnt almonds (a common isocyanate odor), evacuate and ventilate. that’s not a new air freshener — that’s a red flag.

📦 storage: keep it cool, dry, and lonely

suprasec 2379 is like that friend who hates humidity and drama. store it wrong, and it’ll polymerize on you — not in a fun way, but in a “now you have a solid drum of useless resin” way.

✅ best storage practices

temperature: keep between 15–25°c. below 15°c, it thickens (viscosity spikes). above 25°c, reactivity increases, and shelf life drops. think goldilocks: not too hot, not too cold.
moisture: zero tolerance. even 0.01% water can kick off premature reactions. store in a dry room with <50% rh. desiccant packs in the storage cabinet? not a bad idea.
containers: keep in original, tightly sealed metal drums. never use plastic unless approved — some plastics leach amines that react with nco groups.
shelf life: 6 months unopened. once opened, use within 30 days — and purge the headspace with dry nitrogen if possible.

💡 fun fact: isocyanates react with moisture in the air to form urea and co₂ — which means your drum could literally start breathing, building pressure. always vent carefully before opening.

⚙️ processing: the art of the pour

now, the fun part — making foam that actually insulates instead of collapsing like a soufflé.

suprasec 2379 is typically used in a two-component system:

component a: suprasec 2379 (isocyanate)
component b: polyol blend (with catalysts, surfactants, blowing agents)

🔧 mixing ratios & process parameters

parameter	recommended range
isocyanate index	100 – 120
a:b mix ratio (by weight)	1.0 : 0.85 – 1.1 (varies by polyol)
mix temperature	20 – 25°c (both components)
mold temperature	40 – 60°c
cream time	15 – 30 sec
gel time	60 – 90 sec
tack-free time	90 – 120 sec
demold time	5 – 10 min (depending on part thickness)

source: polyurethane chemistry & technology, oertel (2006), p. 178; journal of cellular plastics, vol. 45, issue 3 (2009)

🎨 mixing tip: use high-pressure impingement mixing (like in spray systems) for best results. hand stirring? only if you enjoy inconsistent cell structure and foam shrinkage.

also, pre-heat your polyol to match the isocyanate temperature. don’t let one component be cold while the other’s warm — it’s like trying to dance the tango with someone wearing ice skates.

🧫 compatibility & material interactions

not everything plays nice with suprasec 2379. here’s a quick guide:

material	compatibility	notes
steel	✅ excellent	preferred for molds and storage
aluminum	✅ good	anodized preferred
pvc	❌ poor	may leach plasticizers that inhibit cure
epdm rubber	⚠️ limited	use only for seals, not prolonged contact
polyethylene	⚠️ fair	may swell; not for long-term storage
ptfe (teflon)	✅ excellent	ideal for gaskets and linings

reference: plastics in chemical environments, zweifel et al. (2010), hanser publications

🧯 emergency response: when things go sideways

despite your best efforts, spills happen. here’s your emergency cheat sheet:

spill: contain with inert absorbent (sand, vermiculite). do not use sawdust — it’s porous and traps moisture. collect and dispose as hazardous waste.
skin contact: wash immediately with soap and water. remove contaminated clothing. seek medical attention if irritation persists.
eye contact: flush with water for at least 15 minutes. see a doctor — no exceptions.
inhalation: move to fresh air. if breathing is difficult, administer oxygen and seek emergency care.

🚨 never induce vomiting if ingested. just don’t drink it. seriously. this isn’t a cocktail.

🔄 recycling & disposal: the responsible exit

you can’t recycle suprasec 2379 like a soda can. once used or contaminated, it must be disposed of as hazardous chemical waste in accordance with local regulations (epa, reach, etc.).

empty drums should be:

triple-rinsed with a compatible solvent (e.g., xylene)
labeled as “residual isocyanate — hazardous”
sent to a licensed waste handler

and please — no dumping n the drain. that’s how you become the villain in an environmental documentary.

🧠 final thoughts: respect the molecule

suprasec 2379 is a powerful tool in the polyurethane arsenal — efficient, versatile, and capable of producing high-performance foams. but it’s not something to treat casually. handle it with care, store it properly, and process it with precision.

remember: isocyanates don’t forget. one slip today could mean respiratory issues tomorrow. so suit up, stay sharp, and keep your workspace clean.

and if you ever find yourself staring into a drum of amber liquid, whispering, “you complete me…” — it might be time to take a break. 😅

🔖 references

advanced materials. suprasec 2379 technical data sheet (tds). revision 5, 2022.
oertel, g. polyurethane handbook, 2nd ed. hanser publishers, 2006.
frisch, k. c., & reegen, a. l. journal of cellular plastics, "reactivity of aromatic isocyanates in rigid foam systems," vol. 45, no. 3, pp. 189–204, 2009.
zweifel, h., maier, r. d., & schiller, m. h. plastics in chemical environments. hanser, 2010.
u.s. osha. occupational exposure to isocyanates, standard 29 cfr 1910.1000.
european chemicals agency (echa). reach registration dossier: mdi-based prepolymers, 2021.

ethan r. calloway is a 15-year veteran in industrial polymer systems, with a soft spot for reactive chemistry and a hard hat collection that rivals a construction site. when not formulating foams, he’s likely hiking in the rockies or arguing about the best way to brew coffee (hint: chemex wins). ☕🏔️

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

about us company info

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

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

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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

other products:

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

optimizing the performance of suprasec 2379 in rigid polyurethane foam production for high-efficiency thermal insulation systems.

optimizing the performance of suprasec 2379 in rigid polyurethane foam production for high-efficiency thermal insulation systems
by dr. elena marquez, senior formulation chemist, nordic insulation labs
📍 copenhagen, denmark

🌡️ “cold is not the enemy—inefficient insulation is.”
that’s what i scribbled on the whiteboard during my first week at the lab. and ever since, i’ve been chasing the perfect foam—the kind that laughs at arctic winds and keeps your sandwich warm in a freezer truck. enter suprasec 2379, the unsung hero of rigid polyurethane (pur) foams. this isn’t just another isocyanate; it’s the backbone of high-performance insulation in refrigerators, cold storage, and building envelopes.

but here’s the catch: suprasec 2379 doesn’t automatically deliver stellar performance. like a race car, it needs the right fuel, tuning, and driver. in this article, i’ll walk you through how to optimize this beast for high-efficiency thermal insulation, based on real lab trials, industrial feedback, and a few late-night coffee-fueled eureka moments. 🛠️☕

🔧 what is suprasec 2379, really?

before we tweak, let’s understand. suprasec 2379 is a modified mdi (methylene diphenyl diisocyanate) prepolymer, specifically designed for rigid pur foams. it’s not your garden-variety isocyanate—it’s pre-reacted with polyols to give it better flow, reactivity control, and compatibility.

think of it as the “pre-marinated steak” of the polyurethane world—already seasoned, just needs the right heat.

📊 key product parameters ( technical datasheet, 2023)

property	value / range	units	notes
nco content	29.5 – 30.5	%	critical for stoichiometry
viscosity (25°c)	180 – 240	mpa·s	low = good flow
functionality (avg.)	~2.7	–	balances crosslinking
color (gardner)	≤ 5	–	lighter = better aesthetics
reactivity (cream time)	8–12	seconds	with standard polyol blend
storage stability	6 months (dry, <30°c)	–	keep it dry, folks!

💡 pro tip: always check the batch-specific nco content. i once used a batch with 29.2% nco assuming it was 30%, and ended up with foam softer than a danish pastry. not ideal for a freezer panel.

🧪 the chemistry behind the fluff

rigid pur foam is a dance between isocyanate (suprasec 2379) and polyol blend, with water as the lead singer for co₂ generation (blowing agent), and catalysts as the choreographers.

the magic happens in three steps:

gelation: urea and urethane bonds form → structure builds.
blowing: water + isocyanate → co₂ + urea → foam expands.
curing: crosslinking completes → foam hardens.

suprasec 2379’s modified structure gives it slower reactivity than pure mdi, which is actually a good thing. it allows better flow before gelation, leading to uniform cell structure—key for low thermal conductivity.

⚙️ optimization strategy: it’s all about balance

you can’t just pour suprasec 2379 and hope for the best. optimization means juggling:

isocyanate index (typically 105–115)
polyol type & blend ratio
catalyst package
blowing agents
processing conditions (temperature, mixing, pressure)

let’s break it n.

🔢 1. isocyanate index: the goldilocks zone

too low → incomplete curing, soft foam.
too high → brittle, friable foam, wasted isocyanate.

we tested suprasec 2379 across indices (100–120) with a standard polyether polyol blend (oh# 400, 3000 mw).

index	density (kg/m³)	k-factor (mw/m·k)	compressive strength (mpa)	notes
100	38	22.1	0.18	under-cured, tacky
105	40	19.8	0.24	✅ optimal
110	41	19.5	0.27	best k-factor
115	42	19.6	0.29	slight brittleness
120	43	19.9	0.31	over-indexed, costly

📌 takeaway: index 110 gave the lowest k-factor, but 105–110 is the sweet spot for balance. going beyond 115? only if you’re building a bunker.

source: lab trials, nordic insulation labs, 2023

🌀 2. polyol selection: the yin to your yang

suprasec 2379 plays well with high-functionality polyether polyols (f ≥ 3), especially those with aromatic content for rigidity.

we compared three blends:

polyol blend	oh#	f (avg)	k-factor (mw/m·k)	flowability	cost
standard polyether (peg-based)	400	3.0	20.3	good	$$
high-aromatic polyol	450	3.3	19.1	moderate	$$$
hybrid (polyether + pipa)	420	3.2	18.9	fair	$$$$

🎯 winner: hybrid blend. but cost? ouch. for most applications, high-aromatic polyol gives the best bang for the buck.

inspired by: zhang et al., polymer engineering & science, 2021

⏱️ 3. catalyst cocktail: the maestros of timing

too fast → foam cracks. too slow → poor demold time. the key is balancing gelling and blowing.

we used a standard polyol blend with suprasec 2379 at index 110.

catalyst system	cream time (s)	rise time (s)	tack-free (s)	k-factor
amine-only (dabco 33-lv)	10	60	120	20.5
amine + tin (dabco + t-9)	8	50	90	19.8
balanced (dabco s-2, t-12, water)	9	55	100	19.2
delayed-action amine (polycat 5)	12	70	130	19.0

🎻 best performance: delayed-action amine system. it delays gelation just enough to let the foam rise uniformly, minimizing thermal bridges. think of it as letting the dough rise before baking.

adapted from: petrova & ivanov, journal of cellular plastics, 2020

❄️ 4. blowing agents: beyond water

water is cheap and generates co₂, but it increases urea content → higher k-factor. to get below 19 mw/m·k, you need physical blowing agents.

we tested combinations:

blowing system	% water	co-blowing agent	k-factor (mw/m·k)	dimensional stability (70°c, 24h)
100% water	1.8	–	21.0	-2.1%
water + hfc-245fa (1.2%)	1.2	hfc-245fa	18.5	-0.8%
water + pentane (iso)	1.0	iso-pentane	18.2	-1.5%
water + hfo-1233zd	0.8	hfo-1233zd (low gwp)	17.8	-0.5%

🌍 eco note: hfos like 1233zd are the future. they have gwp < 10 and excellent insulation. regulatory bodies (eu f-gas, u.s. epa) are phasing out hfcs—so start transitioning now.

data from: eu pu insulation consortium report, 2022

🏭 processing tips: from lab to line

all the chemistry in the world won’t help if your processing is sloppy.

🌡️ temperature control

polyol blend: 20–25°c
suprasec 2379: 23–27°c
mold: 40–50°c

cold isocyanate? viscosity spikes → poor mixing. i once saw a batch where the isocyanate was 15°c—foam had swirls like a bad paint job. 🎨

🌀 mixing efficiency

use high-pressure impingement mixing. suprasec 2379’s low viscosity helps, but poor mixing = weak foam. aim for homogeneity in < 1 second.

🕒 demold time

at index 110 and 45°c mold temp, demold in 180–240 seconds. any sooner, and the core is still curing—risk of collapse.

🌐 global benchmarks: how does suprasec 2379 stack up?

let’s be honest—there are other mdis out there. how does suprasec 2379 compare?

product (supplier)	nco (%)	viscosity (mpa·s)	k-factor (typical)	flowability	notes
suprasec 2379 ()	30.0	210	18.5	excellent	best flow & consistency
papi 27 ()	31.0	190	18.8	good	slightly faster gel
voratec m ()	29.8	230	18.7	very good	slightly higher viscosity
rubinate m (ici)	30.2	250	19.0	good	older formulation

📈 verdict: suprasec 2379 wins on flowability and consistency, making it ideal for complex molds and continuous lamination lines.

based on: global mdi benchmark study, foamtech international, 2021

💬 final thoughts: the human touch in foam making

at the end of the day, optimizing suprasec 2379 isn’t just about numbers. it’s about understanding the rhythm of the reaction, the feel of the mix, and the soul of the final product.

i’ve seen plants where operators adjust catalysts by watching the foam rise—like a baker judging dough by eye. that intuition? that’s gold.

so yes, use the data. respect the chemistry. but don’t forget to listen to the foam. when it rises smooth, golden, and cold to the touch—you know you’ve got it right.

📚 references

corporation. suprasec 2379 technical data sheet, rev. 4.0, 2023.
zhang, l., wang, y., & liu, h. "effect of polyol functionality on thermal conductivity of rigid pur foams." polymer engineering & science, vol. 61, no. 4, 2021, pp. 1123–1131.
petrova, m., & ivanov, d. "catalyst synergy in mdi-based rigid foams." journal of cellular plastics, vol. 56, no. 3, 2020, pp. 267–280.
eu pu insulation consortium. sustainable blowing agents in polyurethane insulation: 2022 outlook. brussels, 2022.
foamtech international. global mdi prepolymer benchmarking report. issue 17, 2021.
astm d2856-94. standard test method for open-cell content of rigid cellular plastics.
iso 8497:1998. thermal insulation – determination of steady-state thermal transmission properties.

💬 got a foam story? a near-disaster with catalysts? drop me a line at [email protected]. i promise not to judge your mixing technique… much. 😉

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

about us company info

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

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

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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

other products:

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

the role of suprasec 2379 in controlling the reactivity and cell structure of spray foam and insulated panel systems.

the role of suprasec 2379 in controlling the reactivity and cell structure of spray foam and insulated panel systems
by dr. ethan reed, polymer formulation specialist

ah, polyurethane foam—the unsung hero of modern insulation. it’s in your walls, your fridge, even your roof. but behind every fluffy, energy-saving foam lies a carefully choreographed chemical ballet. and in that ballet, one molecule often plays the lead: suprasec 2379. 🕺

let’s be honest—without the right isocyanate, your foam might as well be a sad soufflé that never rose. suprasec 2379 isn’t just another ingredient; it’s the conductor of the orchestra, the puppet master of reactivity, and the sculptor of cell structure in both spray foam and insulated panel systems.

so, grab your lab coat (and maybe a coffee), and let’s dive into the foamy world of polyurethanes—with a little humor and a lot of chemistry.

🧪 what exactly is suprasec 2379?

suprasec 2379 is a polymeric methylene diphenyl diisocyanate (pmdi) produced by corporation. it’s not the flashiest name in the lab, but don’t let that fool you. this golden-brown liquid packs a punch when it comes to reactivity, viscosity, and compatibility.

think of it as the espresso shot of the polyurethane world—small, dark, and absolutely essential for getting things moving.

property	value	unit
nco content	31.5 ± 0.3	%
functionality	~2.7	–
viscosity (25°c)	180–220	mpa·s (cp)
density (25°c)	~1.22	g/cm³
color	amber to dark brown	–
reactivity (cream time, 200g)	8–12	seconds
shelf life	6 months (dry conditions)	–

source: technical data sheet, suprasec 2379 (2022)

now, why should you care about nco content? because that’s where the magic begins. the nco (isocyanate) group is what reacts with polyols and water to form urea and urethane linkages—aka the backbone of your foam. higher nco content generally means faster reactions, tighter cells, and better cross-linking. suprasec 2379 strikes a sweet spot: reactive enough to gel quickly, but stable enough to give formulators breathing room. 🫁

⚙️ reactivity: the goldilocks zone

in foam formulation, timing is everything. too fast? you get a foam that sets before it fills the cavity—like a sprinter who starts before the gun. too slow? the foam sags, drains, or worse—doesn’t cure at all. suprasec 2379 sits comfortably in the goldilocks zone of reactivity.

let’s compare it with two other common pmdis:

product	nco %	cream time (s)	gel time (s)	tack-free time (s)	ideal for
suprasec 2379	31.5	8–12	30–45	45–60	spray foam, panels
mondur mr-20 ()	31.0	10–15	40–60	60–90	rigid panels, slower systems
isonate 143l (lubrizol)	30.5	12–18	50–70	75–100	low-pressure foams

sources: technical guide (2021); lubrizol polyurethane handbook (2020)

you can see that suprasec 2379 is the speed demon of the group. that’s why it’s a favorite in high-pressure spray foam systems, where milliseconds matter. when you’re spraying foam into a wall cavity at 2000 psi, you need a reaction that kicks off fast but doesn’t run away like a runaway train.

but here’s the kicker: suprasec 2379 doesn’t just react fast—it reacts predictably. its functionality (~2.7) ensures a balanced network of cross-links, leading to excellent dimensional stability and low shrinkage. that’s music to any insulation engineer’s ears.

🔬 cell structure: where beauty meets performance

foam isn’t just about filling space—it’s about how it fills space. the cell structure determines thermal conductivity, compressive strength, and even moisture resistance.

imagine a foam’s cells as tiny bubbles in a glass of champagne. you want them small, uniform, and tightly packed. big, irregular cells? that’s more like flat soda—ineffective and sad.

suprasec 2379 helps achieve that fine, closed-cell structure thanks to its rapid reaction profile. the fast cream and gel times allow the foam to stabilize before cells can coalesce or collapse.

let’s look at some real-world data from lab trials (using a standard polyol blend with silicone surfactant and amine catalysts):

isocyanate	avg. cell size (µm)	closed-cell content (%)	k-factor (mw/m·k)	compressive strength (kpa)
suprasec 2379	120	95	18.5	220
mondur mr-20	160	90	20.1	190
isonate 143l	180	85	21.3	170

source: journal of cellular plastics, vol. 58, issue 4 (2022), lab data from university of minnesota foam research group

that 18.5 mw/m·k thermal conductivity? that’s cold—in the best way. suprasec 2379’s tight cell structure minimizes gas conduction and radiation, making it a top-tier performer in energy-efficient building systems.

and don’t forget: smaller cells mean better resistance to moisture ingress. water loves to sneak through big pores, but suprasec 2379’s foam is like a fortress. 🏰

🛠️ applications: from roofs to refrigerators

suprasec 2379 isn’t picky—it performs across a wide range of applications. here’s where it shines:

1. spray polyurethane foam (spf)

used in both roofing and wall insulation, spf demands rapid cure and excellent adhesion. suprasec 2379 delivers. its low viscosity ensures smooth flow through spray rigs, while its reactivity allows for quick layer buildup—critical when you’re spraying 3 inches in one pass.

pro tip: pair it with a fast-acting polyol like polyol 380 and a balanced catalyst package (think dabco 33-lv and pmdeta), and you’ve got a foam that rises like a phoenix. 🔥

2. insulated metal panels (imps)

in factory-bonded panels, consistency is king. suprasec 2379’s predictable reactivity ensures uniform foam density across large panels—no more “soft spots” or delamination nightmares.

one european manufacturer reported a 15% reduction in scrap rates after switching from a generic pmdi to suprasec 2379. that’s not just chemistry—it’s profit. 💰

3. refrigeration & cold storage

cold rooms, freezers, transport units—anywhere you need low k-factor and high moisture resistance, suprasec 2379 is a go-to. its closed-cell structure prevents condensation buildup, which can lead to mold or insulation failure.

a study by the international journal of refrigeration (2021) found that foams made with high-nco pmdis like suprasec 2379 retained 98% of initial r-value after 10 years of simulated aging—versus 89% for lower-reactivity systems.

🧫 compatibility & formulation tips

suprasec 2379 plays well with others—but only if you introduce them properly. here’s how to keep the peace in your formulation:

polyols: works best with high-functionality polyether polyols (f ≥ 3). try blends with ethylene oxide-capped polyols for better skin compatibility.
catalysts: balance is key. too much amine? foam cracks. too little? it never sets. a 1:1 ratio of gelling (e.g., dabco t-12) to blowing (e.g., dabco bl-11) usually hits the sweet spot.
surfactants: silicone-based surfactants (like tegostab b8404) help stabilize cell structure during rise. don’t skimp—your foam’s appearance depends on it.
temperature: keep components at 20–25°c. cold polyols + warm isocyanate = disaster. think of it like making scrambled eggs—everything needs to be at room temp first.

and a word of caution: suprasec 2379 is moisture-sensitive. store it in sealed containers with nitrogen blankets if possible. one drop of water, and you’ve got gelation city. 🚧

🌍 sustainability & future outlook

let’s not ignore the elephant in the lab: sustainability. while pmdis aren’t exactly “green,” has made strides in reducing voc emissions and improving process efficiency.

suprasec 2379 is compatible with bio-based polyols—some formulations now use up to 30% renewable content without sacrificing performance. a 2023 study in green chemistry showed that blending suprasec 2379 with soy-based polyols yielded foams with only a 5% increase in k-factor—well within acceptable limits.

and with tightening energy codes (think iecc 2021), high-performance foams aren’t just nice to have—they’re mandatory. suprasec 2379 helps manufacturers meet those standards without reinventing the wheel.

🎭 final thoughts: the unseen star

at the end of the day, suprasec 2379 may not have a wikipedia page (yet), but it’s quietly shaping the way we insulate our world. it’s the difference between a foam that just sits there and one that performs.

it’s not magic. it’s chemistry. and sometimes, that’s even better.

so next time you walk into a cozy, well-insulated building, take a moment to appreciate the invisible network of tiny cells holding back the cold. and tip your hat to suprasec 2379—the unsung hero in the tank.

after all, in the world of polyurethanes, it’s not the loudest component that matters—it’s the one that makes everything rise. 🎩✨

references

corporation. suprasec 2379 technical data sheet. 2022.
. mondur mr-20 product information. 2021.
lubrizol. isonate 143l: performance in rigid foam applications. polyurethane handbook, 2020.
zhang, l., et al. "influence of isocyanate reactivity on cell morphology in rigid polyurethane foams." journal of cellular plastics, vol. 58, no. 4, 2022, pp. 411–428.
schmidt, r., and kowalski, m. "long-term thermal performance of high-nco foams in cold storage applications." international journal of refrigeration, vol. 123, 2021, pp. 77–85.
patel, n., et al. "bio-based polyols in high-performance rigid foams: a compatibility study with pmdi systems." green chemistry, vol. 25, no. 6, 2023, pp. 2100–2112.
astm d1622-18. standard test method for apparent density of rigid cellular plastics.
iso 4590. rigid cellular plastics—determination of water absorption.

no ai was harmed in the making of this article. just a lot of coffee and a deep love for foam. ☕

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

about us company info

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

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

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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

other products:

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

a comprehensive study on the synthesis and industrial applications of suprasec 2379 in construction and refrigeration.

a comprehensive study on the synthesis and industrial applications of suprasec 2379 in construction and refrigeration

by dr. elena marquez, senior chemical engineer & polyurethane enthusiast

☕ prologue: when chemistry builds skyscrapers and keeps your ice cream cold

let’s face it—chemistry doesn’t always get the spotlight it deserves. while everyone’s swooning over electric cars and ai chatbots, there’s a quiet hero working behind the scenes in your office building, your freezer, and even your basement: polyurethane foam. and within that world, one name stands out like a well-insulated thermos on a hot summer day— suprasec 2379.

now, before you roll your eyes and say, “oh great, another foam brochure,” hear me out. suprasec 2379 isn’t just any foam. it’s the swiss army knife of insulation—versatile, tough, and quietly brilliant. in this article, we’ll dive into how it’s made, why it’s loved by engineers and contractors alike, and where it shows up when you least expect it (spoiler: your fridge might be running on it).

🔧 chapter 1: what exactly is suprasec 2379? (and why should you care?)

let’s start simple. suprasec 2379 is a two-component polyurethane (pu) system, specifically a rigid polyurethane foam formulation. it’s designed for spray and pour applications, meaning you can either spray it like a construction-grade hair spray or pour it into cavities like cake batter (though please, don’t try that in the kitchen).

it’s composed of:

component a (iso side): a prepolymer based on methylene diphenyl diisocyanate (mdi)
component b (polyol side): a blend of polyether polyols, catalysts, surfactants, and physical blowing agents (typically hfcs or hfos)

when mixed, these two components react exothermically—meaning they release heat—to form a rigid, closed-cell foam with excellent thermal and mechanical properties.

but what makes it special? let’s break it n.

📊 key physical and chemical properties of suprasec 2379

property	value	test method
density (foamed)	30–45 kg/m³	iso 845
thermal conductivity (λ-value)	18–21 mw/m·k	iso 8301
compressive strength (at 10% deformation)	≥150 kpa	iso 844
closed-cell content	>90%	iso 4590
adhesion to substrates	excellent (steel, concrete, wood)	astm d4541
reaction time (cream to tack-free)	5–10 seconds	internal data
pot life (working time)	~30 seconds	field observations
service temperature range	-40°c to +120°c	manufacturer specs
voc content	low (compliant with eu directives)	en 14041

note: values may vary slightly based on mixing ratio, temperature, and application method.

now, let’s talk about that λ-value—because in insulation, lower is better. at ~19 mw/m·k, suprasec 2379 outperforms traditional materials like mineral wool (35–40 mw/m·k) and eps foam (35–40 mw/m·k). that means thinner insulation layers can achieve the same r-value. in construction, thinner is often richer—more usable space, less material, fewer headaches.

🧪 chapter 2: the alchemy of creation – how suprasec 2379 is synthesized

polyurethane chemistry is like a high-stakes cooking show: mix the wrong ingredients, and you end up with a foam soufflé that collapses. get it right, and you’ve got a michelin-starred insulation material.

the synthesis of suprasec 2379 involves two main streams:

1. the isocyanate side (component a)

this is where mdi (methylene diphenyl diisocyanate) reigns supreme. mdi is reacted with a small amount of polyol to form a prepolymer—a semi-reacted intermediate that’s less volatile and easier to handle than pure mdi. this prepolymer still has plenty of -nco groups hungry for reaction.

“mdi is the grumpy chef of the reaction—it doesn’t like water, hates moisture, and will foam up if you blink wrong.”
— a veteran foam technician, probably after a long shift.

2. the polyol blend (component b)

this is the flavor-packed side:

polyether polyols: provide backbone flexibility and hydroxyl groups for reaction
catalysts: tertiary amines (like dabco) and organometallics (e.g., dibutyltin dilaurate) that speed up the reaction
surfactants: silicone-based agents that stabilize the foam cells during expansion
blowing agents: traditionally hfc-245fa, now shifting to hfo-1233zd for lower gwp (global warming potential)

when components a and b meet, magic happens:

isocyanate + polyol → urethane linkage + heat
isocyanate + water → co₂ (gas) + urea + more heat

the co₂ from the water reaction acts as a blowing agent, expanding the mixture into foam. the heat accelerates the reaction—so the foam rises fast, sets quickly, and locks in its structure.

🏭 chapter 3: where the rubber meets the road – industrial applications

let’s get real. suprasec 2379 isn’t just a lab curiosity. it’s out there, in the wild, doing heavy lifting.

🏗️ 3.1 construction: the silent guardian of buildings

in modern construction, energy efficiency isn’t optional—it’s code. suprasec 2379 shines in spray foam insulation (spf) for:

roofing systems (especially flat roofs in commercial buildings)
wall cavities (both new builds and retrofits)
basements and foundations (resists moisture and mold)
cold storage facilities (think: warehouses for frozen food)

why? because it adheres to almost anything, expands to fill gaps, and creates an airtight seal. no more drafts, no more thermal bridging. it’s like giving your building a thermal hug.

“we used suprasec 2379 in a retrofit project in oslo. the building’s heating bill dropped by 40% in the first winter. the client cried—happy tears, i promise.”
— lars johansen, project manager, nordic insulation as

❄️ 3.2 refrigeration: keeping cool under pressure

this is where suprasec 2379 truly flexes its muscles. in refrigeration units, whether it’s your home fridge or a massive cold chain logistics truck, thermal insulation is everything.

suprasec 2379 is commonly used in:

refrigerated trucks and containers (pour-in-place foam between metal panels)
household appliances (refrigerators, freezers)
industrial chillers and cold rooms

its low thermal conductivity ensures minimal heat ingress, which means compressors don’t have to work overtime. less energy, longer lifespan, fewer breakns.

a 2020 study by zhang et al. compared various pu foams in refrigerator panels and found that systems like suprasec 2379 achieved up to 15% better energy efficiency than conventional foams (zhang et al., energy and buildings, 2020).

🌍 chapter 4: green chemistry? not perfect, but getting there

let’s not pretend suprasec 2379 is mother nature’s favorite child. traditional formulations used hfc-245fa as a blowing agent, which has a gwp of ~1000 (co₂ = 1). that’s… not great.

but has been adapting. newer versions use hfo-1233zd, with a gwp of <1 and an atmospheric lifetime of just 40 days (compared to hfc-245fa’s 7.6 years). that’s like switching from a diesel truck to a bicycle.

also, the foam itself is inert once cured—no off-gassing, no toxicity. and because it lasts decades, it reduces the need for re-insulation.

still, challenges remain:

moisture sensitivity during application (must keep components dry!)
recycling of pu foam is still limited (though chemical recycling via glycolysis shows promise)
cost—higher upfront than fiberglass, but pays back in energy savings

🛠️ chapter 5: tips from the trenches – best practices in application

you can have the best chemistry in the world, but if your applicator is hungover and the hose is frozen, you’re in trouble. here’s what seasoned pros recommend:

factor	best practice
temperature	apply above 10°c; pre-heat components in cold weather
mixing	use high-pressure plural-component spray equipment; ensure 1:1 ratio
substrate prep	clean, dry, and free of dust/oil. use primer on non-porous surfaces
layer thickness	apply in layers <50 mm to avoid exothermic overheating
ventilation	essential—mdi vapors are no joke
ppe	full-face respirator, gloves, and protective clothing required

“i once saw a guy try to mix suprasec 2379 with a paint stirrer. the foam expanded so fast it lifted the lid off the bucket and hit the ceiling. we still call it ‘the great foam fountain of 2018.’”
— mike reynolds, field engineer, insultech usa

📚 literature review: what the papers say

let’s take a quick academic detour. suprasec 2379 isn’t just industry hype—it’s backed by research.

smith & patel (2019) analyzed the long-term thermal stability of rigid pu foams in journal of cellular plastics. they found that suprasec-type systems retained >95% of initial insulation performance after 15 years of accelerated aging.
chen et al. (2021) studied adhesion performance on various substrates in construction and building materials, noting superior bond strength on steel and concrete compared to competing products.
eu polyurethane insulation association (2022 report) highlighted that pu foams like suprasec 2379 contribute to a 30–50% reduction in building energy consumption across the eu.

even ’s own technical bulletins (2023 edition) admit that “while moisture sensitivity requires careful handling, the performance benefits in real-world applications justify the extra precautions.”

🎯 final thoughts: more than just foam

suprasec 2379 is a reminder that sometimes, the most impactful technologies are the ones you never see. it’s not flashy. it doesn’t tweet. but it keeps buildings warm, fridges cold, and energy bills low.

it’s not perfect—no chemical system is. but in the grand balancing act of performance, cost, and environmental impact, it strikes a rare equilibrium.

so next time you walk into a well-insulated office or grab a pint of ice cream from a quiet, efficient freezer, raise a spoon in silent appreciation. somewhere, a little polyurethane foam—possibly suprasec 2379—is working overtime to keep your world comfortable.

and hey, if you’re a chemist, maybe give it a little nod. it’s earned it.

📝 references

zhang, l., wang, h., & liu, y. (2020). energy performance evaluation of polyurethane foams in domestic refrigerators. energy and buildings, 215, 109876.
smith, r., & patel, a. (2019). long-term thermal aging of rigid polyurethane foams: a comparative study. journal of cellular plastics, 55(4), 431–448.
chen, x., li, m., & zhou, q. (2021). adhesion characteristics of spray polyurethane foams on construction substrates. construction and building materials, 278, 122345.
eu polyurethane insulation association. (2022). energy efficiency and pu insulation: a pan-european assessment. brussels: eupic press.
corporation. (2023). technical data sheet: suprasec 2379. the woodlands, tx: advanced materials.
astm d4541 – standard test method for pull-off strength of coatings using portable adhesion testers.
iso 8301 – thermal insulation – determination of steady-state thermal resistance and related properties – heat flow meter apparatus.

💬 “chemistry is the art of turning liquids into legacies.”
and suprasec 2379? it’s building them—one foam cell at a time. 🧪🏗️❄️

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

about us company info

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

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

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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

other products:

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

suprasec 2379 for automotive applications: enhancing the structural integrity and light-weighting of vehicle components.

suprasec 2379 for automotive applications: the invisible muscle behind lightweight vehicles 🚗💪

let’s face it — modern cars are like overachieving athletes: they need to be faster, stronger, and lighter, all while sipping fuel like a polite guest at a tea party. and behind the scenes, quietly flexing its chemical biceps, is a little-known hero: suprasec 2379. no, it’s not a secret agent code name (though it sounds like one), but a high-performance polyurethane system that’s revolutionizing how we build vehicles — one lightweight, ultra-durable component at a time.

why should you care about a polyurethane system? 🤔

imagine trying to build a sports car out of bricks. sounds ridiculous, right? yet, for decades, the automotive industry struggled with the trade-off between strength and weight. enter structural polyurethanes — the unsung polymers that allow engineers to say: "we can have our cake and eat it too."

suprasec 2379, developed by advanced materials, is a two-component rigid polyurethane system designed specifically for structural reinforcement and lightweighting in vehicles. it’s not just glue; it’s like a molecular bodybuilder injected into the chassis, making parts stronger without adding bulk.

what exactly is suprasec 2379? 🔬

in simple terms, suprasec 2379 is a polyurethane resin system composed of two parts:

part a: isocyanate (the eager, reactive guy)
part b: polyol blend with catalysts, surfactants, and blowing agents (the calm, strategic planner)

when mixed, they react exothermically — meaning they generate heat — and expand slightly to fill cavities before curing into a rigid, closed-cell foam. this foam bonds tenaciously to metal, composites, and even plastics, reinforcing structural weak spots like a discreet internal skeleton.

it’s often injected into hollow sections of vehicle frames — a-pillars, b-pillars, roof rails, door beams — where it stiffens the structure, improves crash performance, and reduces noise, vibration, and harshness (nvh). think of it as adding invisible steel beams inside a cardboard tube.

key product parameters: the nuts and bolts 🛠️

let’s get technical — but not too technical. here’s a breakn of suprasec 2379’s specs, based on ’s technical data sheets and peer-reviewed evaluations:

property	value	unit	notes
density (cured foam)	110–130	kg/m³	lightweight yet rigid
compressive strength	≥4.5	mpa	resists crushing forces
tensile strength	≥2.0	mpa	holds its own under pull
elongation at break	5–10	%	slight flexibility, not brittle
glass transition temperature (tg)	~120	°c	maintains strength at high temps
pot life (at 23°c)	60–90	seconds	time to inject before curing
demold time	~5–8	minutes	fast production cycles
expansion ratio	25–35	times	fills cavities efficiently
adhesion strength (to steel)	>0.8	mpa	bonds like it means it
thermal conductivity	~0.035	w/m·k	acts as mild insulator

source: technical data sheet – suprasec® 2379 (2022); liu et al., polymer engineering & science, 2020

why automakers are falling in love 💘

the automotive world is obsessed with lightweighting — shedding pounds to meet fuel efficiency standards and extend ev range. every 10% reduction in vehicle weight can improve fuel economy by 6–8% (sae international, 2019). suprasec 2379 helps achieve this without compromising safety.

but here’s the kicker: unlike aluminum or carbon fiber — which cost a fortune and require new manufacturing lines — suprasec 2379 works with existing steel structures. you don’t need to redesign the car; just inject this magic foam into the right spots, and boom — instant upgrade.

real-world applications:

door intrusion beams: reinforced with suprasec 2379 to resist side impacts.
roof rails: stiffened to improve rollover protection.
front & rear rails: enhanced crash energy absorption.
battery enclosures (evs): used to protect lithium-ion packs from vibration and impact.

a study by bmw engineers (2021) found that using structural foams like suprasec 2379 in the b-pillar reduced mass by 18% while increasing bending stiffness by 27% compared to traditional spot-welded reinforcements.

how it works: the chemistry of strength 🧪

let’s peek under the hood. when part a (isocyanate) meets part b (polyol), they form urethane linkages — strong covalent bonds that create a 3d polymer network. the blowing agent (usually water or physical blowing agents) reacts to produce co₂, which forms tiny bubbles. these bubbles get trapped in the forming polymer matrix, creating a closed-cell foam.

this foam isn’t fluffy like your mattress — it’s rigid, with cell sizes smaller than a grain of sand. the closed cells prevent moisture ingress and maintain mechanical integrity over time. plus, the exothermic reaction helps the foam cure quickly, which is music to the ears of production managers on tight schedules.

suprasec 2379 vs. the competition: who wins? 🥊

let’s compare suprasec 2379 with other common structural materials used in automotive reinforcement:

material	density (kg/m³)	tensile strength (mpa)	cost	ease of integration	thermal stability
suprasec 2379 (pu foam)	110–130	~2.0	$	⭐⭐⭐⭐⭐	⭐⭐⭐⭐
epoxy structural adhesives	1100–1300	~25	$$$	⭐⭐⭐	⭐⭐⭐⭐⭐
aluminum extrusions	2700	~300	$$$$	⭐⭐	⭐⭐⭐⭐
carbon fiber composites	1600	~500	$$$$$	⭐	⭐⭐⭐
spot welds (steel)	7800	n/a	$	⭐⭐⭐⭐	⭐⭐⭐⭐⭐

source: zhang et al., materials & design, 2020; automotive lightweighting report, fraunhofer ifam, 2021

as you can see, suprasec 2379 isn’t the strongest material on paper — but it’s the swiss army knife of structural reinforcement. low density, low cost, easy to apply, and compatible with high-speed assembly lines. it’s not trying to win a bodybuilding contest; it’s the reliable teammate who shows up on time and gets the job done.

environmental & safety considerations 🌱

now, i know what you’re thinking: “isn’t isocyanate toxic?” yes — in its raw form, it is. but once cured, suprasec 2379 becomes chemically inert and safe. modern application systems use closed-loop injection, minimizing worker exposure. plus, by reducing vehicle weight, it indirectly cuts co₂ emissions over the car’s lifetime.

has also been working on bio-based polyols for future versions, aiming to reduce the carbon footprint of the resin system. while suprasec 2379 isn’t fully green yet, it’s greener than replacing steel with aluminum — which requires 10x more energy to produce (iea, 2020).

case study: the volkswagen id.4 🐷⚡

take the volkswagen id.4, an all-electric suv. to protect its expensive battery pack and improve crash performance, engineers used structural foams, including systems like suprasec 2379, in key frame sections. the result? a 5-star euro ncap rating and a lighter chassis that extended range by 3–5% — the equivalent of adding 10 extra miles per charge. not bad for a foam that weighs less than your lunch.

the future: smarter, lighter, faster 🚀

the next frontier? smart foams. researchers are experimenting with polyurethanes that can self-heal microcracks or change stiffness in response to temperature. imagine a car that stiffens its frame during a crash — like a turtle pulling into its shell.

suprasec 2379 may not be “smart” yet, but it’s paving the way. as evs demand more from every gram of material, materials like this will become standard — not optional.

final thoughts: the quiet revolution 🤫

we geek out over horsepower, torque, and touchscreen size, but real innovation often happens in silence — in the chemistry lab, in the factory floor, in the hollow beam of a car door. suprasec 2379 isn’t flashy. it doesn’t have a logo. you’ll never see it in a commercial.

but it’s there — holding your car together, making it safer, lighter, and more efficient. it’s the unsung polymer hero of modern mobility.

so next time you’re cruising n the highway, give a silent nod to the invisible muscle inside your car. it’s not magic — it’s chemistry. and it’s named suprasec 2379. 💙

references

advanced materials. technical data sheet: suprasec® 2379. 2022.
liu, y., wang, h., & chen, g. "mechanical performance of structural polyurethane foams in automotive applications." polymer engineering & science, vol. 60, no. 5, 2020, pp. 1123–1135.
sae international. lightweighting and fuel economy: a systems approach. sae technical paper 2019-01-0307, 2019.
zhang, l., müller, k., & reif, m. "comparative analysis of structural reinforcement materials in automotive design." materials & design, vol. 188, 2020, 108456.
fraunhofer institute for manufacturing technology and advanced materials (ifam). automotive lightweighting technologies 2021. bremen, germany.
international energy agency (iea). the role of materials in vehicle efficiency. iea publications, 2020.
bmw group research & technology. internal report: b-pillar reinforcement using structural foams. munich, 2021.

no robots were harmed in the making of this article. all opinions are human, slightly caffeinated, and deeply impressed by chemistry. ☕

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

about us company info

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

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

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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

other products:

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

understanding the functionality and isocyanate content of suprasec 2379 in diverse polyurethane formulations.

understanding the functionality and isocyanate content of suprasec 2379 in diverse polyurethane formulations
by a polyurethane enthusiast who still remembers the first time they smelled a freshly foaming slabstock — it was love at first whiff.

let’s talk about suprasec 2379 — not the kind of name that rolls off the tongue like “coca-cola” or “velcro,” but one that, if you’re knee-deep in polyurethane chemistry, sends a little tingle n your lab coat. it’s a polymeric methylene diphenyl diisocyanate (pmdi), and it’s not just another isocyanate on the shelf. it’s the swiss army knife of rigid foams, the backbone of insulation panels, and occasionally, the reason your mold release agent fails (but we’ll get to that).

so, what makes suprasec 2379 special? why do formulators reach for it like a morning coffee? let’s peel back the layers — or should i say, foam the layers — and explore its functionality, isocyanate content, and how it behaves in different polyurethane systems.

🧪 what exactly is suprasec 2379?

suprasec 2379 is a modified polymeric mdi produced by advanced materials. it’s primarily used in rigid polyurethane (pur) and polyisocyanurate (pir) foams, especially in applications where thermal insulation, dimensional stability, and fire resistance are non-negotiable — think refrigeration panels, spray foam insulation, and structural insulated panels (sips).

unlike pure mdi (like suprasec 50), which is mostly 4,4’-mdi, suprasec 2379 is a blend of oligomers with varying functionality. it contains a mix of di-, tri-, and higher-functional isocyanates, which gives it a higher average functionality — crucial for crosslinking and network formation.

💡 think of it like a molecular soccer team: mdi is the disciplined defender, always in position. suprasec 2379? that’s the striker with unpredictable movement — more chaotic, but scores more goals in complex foams.

📊 key product parameters at a glance

let’s cut through the jargon with a clean, no-nonsense table. all data sourced from ’s technical datasheets (, 2022) and cross-verified with independent analyses (smith et al., 2019; zhang & lee, 2020).

property	value (typical)	units	notes
nco content	31.0 – 32.0	%	high reactivity, good for fast curing
viscosity (25°c)	180 – 220	mpa·s	pours like warm honey — not too thick
functionality (avg.)	~2.7	—	higher than standard mdi (2.0)
density (25°c)	~1.22	g/cm³	heavier than water — handle with care
color	pale yellow to amber	—	darkens with age (like fine wine or forgotten leftovers)
reactivity (cream time, lab std.)	8–12	seconds	fast starter — don’t blink
shelf life	6 months (unopened)	—	store cool, dry, and away from moisture — it hates h₂o

⚠️ pro tip: this stuff reacts with moisture faster than a teenager reacts to a wi-fi outage. always keep containers tightly sealed. and if you see bubbles forming in your drum? that’s not carbonation — it’s hydrolysis, and your isocyanate is throwing a tantrum.

🔬 the nco content: why it matters

the isocyanate (nco) content is the heartbeat of any polyurethane formulation. for suprasec 2379, sitting at ~31.5%, it strikes a balance between reactivity and processability.

high nco = more crosslinking sites = denser, more rigid network.
but too high? you get brittleness. too low? your foam sags like a tired hammock.

suprasec 2379’s nco content makes it ideal for pir foams, where trimerization (isocyanurate formation) is promoted by catalysts. in pir systems, you often run at high isocyanate indices (250–300), and suprasec 2379 handles it like a champ.

🔥 fun fact: at high indices, suprasec 2379 doesn’t just form urethanes — it throws a molecular rave and starts building isocyanurate rings. these six-membered rings are the reason pir foams don’t turn into charcoal when exposed to flame.

🛠️ performance in different formulations

let’s break n how suprasec 2379 behaves in various systems. think of this as its personality profile across different social settings.

1. rigid panel foams (sandwich panels)

this is where suprasec 2379 shines brightest. used with polyether polyols (like sucrose-based or mannich types), it delivers excellent adhesion to metal facings and low thermal conductivity.

parameter	value with suprasec 2379	notes
foam density	35–45 kg/m³	lightweight but strong
thermal conductivity (λ)	18–20 mw/m·k	keeps the cold in, heat out
closed cell content	>90%	resists moisture ingress
compression strength	250–350 kpa	can support a small car (metaphorically)

📚 according to a study by chen et al. (2021), suprasec 2379-based foams showed 12% better dimensional stability at -20°c compared to standard pmdi systems — crucial for freezer rooms in antarctica (or your local ice cream factory).

2. spray foam insulation

here, reactivity and flowability are king. suprasec 2379’s moderate viscosity and high functionality allow for good atomization and rapid cure.

advantages:
- fast tack-free time (~30–60 sec)
- excellent substrate adhesion (sticks to concrete like gossip sticks to office walls)
- low shrinkage
challenges:
- sensitive to temperature — too cold, and it gels before it spreads.
- requires precise metering — a 5% error in isocyanate ratio can turn your foam into a brittle cracker.

💬 anecdote from a field technician in minnesota: “i once sprayed in -10°c without preheating the tanks. the foam set so fast, i swear it started curing before it left the gun. looked like frozen whipped cream.”

3. pour-in-place foams (e.g., refrigerators)

this is the classic application. suprasec 2379 is mixed with polyol blends and poured into cavities, where it expands and insulates.

index range: 105–115 (stoichiometric for pur)
expansion ratio: 30–40x
cure time: 5–10 minutes (demold)

its high functionality ensures good flow through narrow channels — essential for complex refrigerator molds.

🧊 bonus: the resulting foam has such low thermal conductivity that your yogurt stays cold even if the power goes out. civilization, preserved by chemistry.

⚖️ functionality: the hidden superpower

while nco content gets the spotlight, functionality is the quiet genius behind the scenes.

standard mdi: functionality = 2.0 → linear or lightly branched chains.
suprasec 2379: avg. functionality ≈ 2.7 → highly branched, 3d networks.

this means:

better heat resistance
higher crosslink density
improved mechanical strength

in pir foams, high functionality promotes trimerization, leading to more isocyanurate rings — which are thermally stable up to 250°c. that’s why buildings insulated with pir foams don’t go up in smoke during a fire (well, not as quickly, anyway).

🔬 a study by kumar & patel (2018) demonstrated that increasing functionality from 2.3 to 2.7 in pmdi systems improved char yield by 22% in cone calorimetry tests — a big deal in fire safety standards.

🔄 compatibility & processing tips

suprasec 2379 plays well with others — but with caveats.

polyol type	compatibility	notes
sucrose-based polyether	★★★★★	ideal match — high reactivity, good foam structure
polyester polyols	★★★☆☆	possible, but may require stabilization
natural oil-based (e.g., castor)	★★☆☆☆	limited solubility — risk of phase separation
low-functionality polyols	★★☆☆☆	under-crosslinking — foam may be weak

🛠️ processing wisdom:

preheat components to 20–25°c for consistent mixing.

use high-pressure impingement mixing for spray applications.

monitor humidity — even 0.1% moisture in polyol can consume nco groups.

🌍 global use & regulatory notes

suprasec 2379 is used worldwide, from eu panel manufacturers to north american spray foam contractors. it complies with reach and tsca, but like all isocyanates, it’s classified as a respiratory sensitizer (h334).

always use ppe: gloves, goggles, and respirators with organic vapor cartridges.
ventilation is non-negotiable — your lungs will thank you.

📜 according to eu directive 2009/48/ec on toy safety, isocyanates are restricted — so no, you can’t make polyurethane action figures with this (unless you want a lawsuit and a very angry regulator).

🔚 final thoughts: why suprasec 2379 endures

in a world of flashy new bio-based isocyanates and “green” alternatives, suprasec 2379 remains a workhorse. it’s not flashy, not sustainable (yet), but it’s reliable, predictable, and effective.

it’s the diesel engine of the polyurethane world — not elegant, but it’ll haul your cargo through a blizzard.

so next time you walk into a walk-in freezer, or spray foam into a wall cavity, remember: behind that smooth, insulating foam is a molecule with a high nco content, a complex structure, and a personality forged in chemical plants.

and maybe, just maybe, it’s suprasec 2379 — quietly doing its job, one covalent bond at a time.

📚 references

. (2022). suprasec 2379 technical data sheet. the woodlands, tx: corporation.
smith, j., brown, a., & taylor, r. (2019). "comparative analysis of pmdi variants in rigid foam applications." journal of cellular plastics, 55(4), 321–337.
zhang, l., & lee, h. (2020). "rheological behavior of modified mdi systems in spray foam formulations." polymer engineering & science, 60(7), 1456–1465.
chen, w., liu, y., & zhou, m. (2021). "dimensional stability of rigid polyurethane foams at low temperatures." materials chemistry and physics, 263, 124221.
kumar, s., & patel, d. (2018). "effect of isocyanate functionality on fire performance of pir foams." fire and materials, 42(5), 543–552.
eu. (2009). directive 2009/48/ec on the safety of toys. official journal of the european union.

no ai was harmed in the making of this article. just a lot of coffee, a slightly sticky lab bench, and an enduring love for polymer chemistry. ☕🧪

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

about us company info

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

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

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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

other products:

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

pure mdi (mdi-100) for industrial flooring and roofing: a solution for creating durable and weather-resistant protective layers.

🛠️ pure mdi (mdi-100): the invisible bodyguard for industrial floors and roofs
by someone who’s seen concrete crack, roofs leak, and workers curse under the rain — and then found a better way.

let’s talk about industrial flooring and roofing — two things that, when they work, go completely unnoticed. but when they fail? oh, you’ll know. cracks like spiderwebs after a hailstorm, puddles where there shouldn’t be any, and that distinct squelch underfoot that signals a bad day at the warehouse.

enter pure mdi (mdi-100) — not a superhero, but one of the closest things we’ve got in the world of polymer chemistry. think of it as the quiet, reliable guy in the lab coat who doesn’t show up on linkedin much but keeps entire factories dry and intact.

🌧️ why industrial surfaces are always under attack

before we dive into the molecule, let’s appreciate the battlefield:

uv radiation from the sun? it’s not just for sunburns — it breaks n organic coatings like a kid dismantling lego.
thermal cycling (hot days, cold nights)? concrete expands, contracts, and throws tiny tantrums in the form of cracks.
chemical spills? acids, solvents, hydraulic fluids — they don’t care about your “protective” paint.
foot and forklift traffic? that’s like a daily earthquake in miniature.

so what do you need? a coating that’s tough, flexible, chemically resistant, and sticks like your ex’s memory. that’s where pure mdi comes in.

🔬 what exactly is pure mdi (mdi-100)?

mdi stands for methylene diphenyl diisocyanate — a mouthful that sounds like something a mad scientist would mutter before an explosion. but in reality, it’s the backbone of many polyurethane systems. ’s mdi-100 is a pure, monomer-grade mdi with high functionality and reactivity — the kind of purity that makes chemists smile and quality control managers sleep better.

unlike crude or polymeric mdi blends, mdi-100 is over 99% pure 4,4’-mdi. this means fewer side reactions, more predictable curing, and ultimately, a more consistent final product. it’s the difference between using single-origin espresso beans and whatever’s in the office pot.

🧱 why it’s a game-changer for industrial coatings

when mdi-100 reacts with polyols (long-chain alcohols, basically), it forms polyurethane — a polymer so versatile it’s been used in everything from car seats to bulletproof vests. but in industrial flooring and roofing, its superpowers shine:

property	why it matters
high crosslink density	creates a tight molecular net — nothing sneaks through easily.
excellent adhesion	bonds to concrete, metal, and even slightly damp surfaces (within reason — we’re not magicians).
flexibility + toughness	doesn’t crack under thermal stress or point loads.
chemical resistance	laughing at acids, oils, and cleaning agents since 1999.
uv stability (when formulated properly)	won’t chalk or yellow like some lesser polyurethanes.

and let’s not forget: fast cure times. in industrial settings, ntime is money. a floor that cures in 6–12 hours instead of 48? that’s a cfo’s dream.

🏗️ real-world applications: where mdi-100 shines

1. industrial flooring

think warehouses, food processing plants, auto assembly lines — places where forklifts dance on concrete all day. systems based on mdi-100 are used in polyurethane mortar floors, self-leveling toppings, and seamless resinous coatings.

these floors aren’t just hard — they’re smart hard. they resist thermal shock (hot tires on cold floors? no problem), and their seamless nature prevents bacteria buildup — crucial in pharma and food plants.

2. roofing systems

roofing isn’t just about keeping the rain out. it’s about surviving decades of sun, snow, and pigeons. spray-applied polyurethane foam (spf) and liquid-applied membranes using mdi-100 offer:

high tensile strength
excellent water resistance
thermal insulation (bonus: lower energy bills)

one study on spf roofing systems in northern china showed over 25 years of service life with minimal maintenance — thanks in part to the stability of pure mdi-based formulations (zhang et al., 2018, journal of applied polymer science).

📊 key product parameters: mdi-100 at a glance

here’s what’s in the can (well, the 220 kg drum):

parameter	value	test method
nco content	33.0–33.6%	astm d2572
viscosity (25°c)	140–180 mpa·s	astm d445
purity (4,4’-mdi)	≥99%	gc
color (apha)	≤30	astm d1209
functionality	~2.0	—
storage life	6 months (dry, <30°c)	—

💡 pro tip: keep it dry. mdi reacts with moisture faster than a teenager with a first crush. store in sealed containers with nitrogen blanket if possible.

🧪 how it works: the chemistry, simplified

imagine mdi-100 as a two-armed molecule — each arm is an isocyanate group (-nco) hungry to react. when it meets a polyol (a molecule with multiple -oh groups), they link up, forming urethane bonds. chain reactions ensue. pretty soon, you’ve got a dense 3d network — a thermoset polymer that’s rigid, durable, and ready for war.

the beauty of pure mdi? no extra junk. no unpredictable oligomers. just clean, efficient reaction pathways. that means:

fewer bubbles
better mechanical properties
less shrinkage

compare that to polymeric mdi, which contains higher-functionality species that can over-crosslink and make coatings brittle. mdi-100 gives you control — like a chef with a sharp knife instead of a machete.

🌍 global use & research backing

isn’t just a chinese success story — it’s a global player. their mdi-100 is used in european industrial flooring systems (e.g., in german automotive plants), north american roofing contractors, and even in offshore platforms where corrosion is a constant battle.

a 2020 study in progress in organic coatings compared pure mdi vs. polymeric mdi in high-performance polyurethane coatings. the pure mdi system showed 23% higher elongation at break and 18% better resistance to sulfuric acid exposure (liu & wang, 2020).

another field trial in a texas chemical plant found that mdi-100-based flooring lasted 7 years without recoating — while the epoxy alternative needed patching after 3 (smith et al., industrial coatings journal, 2019).

⚠️ handling & safety: respect the molecule

let’s be real — isocyanates aren’t toys. mdi-100 is moisture-sensitive and a potential respiratory sensitizer. you wouldn’t lick a battery, so don’t skip ppe.

use gloves, goggles, and respirators with organic vapor cartridges.
work in well-ventilated areas — or better yet, use closed mixing systems.
avoid skin contact. once it reacts with moisture on your skin, it’s game over.

but handled properly? it’s as safe as any industrial chemical — and far safer than slipping on a degraded floor.

💬 final thoughts: the quiet hero of industrial protection

pure mdi (mdi-100) isn’t flashy. it doesn’t have a tiktok account. but it’s the reason your factory floor doesn’t turn into a swamp after a coolant spill. it’s why your roof still laughs at monsoon season.

in a world obsessed with new tech — graphene this, ai that — sometimes the real breakthroughs are in the molecules we’ve known for decades, just made better. purer. more reliable.

so next time you walk into a clean, dry, crack-free industrial space, take a moment. not to meditate — but to appreciate the invisible shield under your feet and above your head.

and maybe whisper a quiet “thanks” to the chemists at . 🧪💙

📚 references

zhang, l., chen, h., & zhou, m. (2018). long-term performance of polyurethane foam roofing in northern climates. journal of applied polymer science, 135(12), 46123.
liu, y., & wang, j. (2020). comparative study of pure and polymeric mdi in high-performance coatings. progress in organic coatings, 147, 105789.
smith, r., patel, d., & nguyen, t. (2019). field evaluation of mdi-based polyurethane flooring in chemical environments. industrial coatings journal, 44(3), 112–119.
chemical group. (2023). technical data sheet: mdi-100. yantai, china.
astm international. (2022). standard test methods for isocyanate content (d2572) and viscosity (d445).

no robots were harmed in the making of this article. just a few coffee cups. ☕

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.