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Highly stable aliphatic isocyanate trimer with excellent light stability and low yellowing tendency.
Low viscosity liquid enabling easy handling, precise metering, and homogeneous mixing with hydroxyl-functional resins.
Fast-reacting at ambient or elevated temperatures, supporting efficient curing cycles in industrial coating processes.
Complies with major global regulatory frameworks including REACH and meets stringent VOC emission limits for solventborne and high-solids systems.
Offers exceptional chemical resistance, hardness development, and weatherability in final polyurethane coatings.
Aerospace topcoats and primer systems requiring long-term UV resistance and mechanical durability.
Automotive OEM clearcoats and refinish coatings where gloss retention and scratch resistance are critical.
Industrial maintenance coatings for steel structures, offshore platforms, and heavy machinery.
Plastic coatings for automotive interior parts and consumer electronics housings.
High-performance wood finishes for premium furniture and architectural millwork.
| Chemical Type | Aliphatic HDI-based isocyanurate trimer |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow transparent liquid |
| NCO Content (wt %) | 21.5 – 22.5 |
| Viscosity at 25 °C (mPa·s) | 800 – 1,200 |
| Density at 20 °C (g/cm³) | 1.17 – 1.19 |
| Flash Point (PMCC, °C) | 145 – 155 |
| Storage Stability | Stable for ≥12 months at ≤25 °C in sealed containers |
Q1: What is the primary function of Desmodur N 100 in coating and adhesive formulations?
A: Desmodur N 100 is an aliphatic HDI-based trimer isocyanate curing agent designed to react with hydroxyl-functional resins (e.g., polyesters, acrylics, or polyethers) to form durable, weather-resistant, and chemically stable polyurethane networks. It enables excellent gloss retention, UV stability, and mechanical performance in high-end industrial and automotive topcoats.
Q2: How does Desmodur N 100 differ from monomeric HDI or other HDI trimers?
A: Desmodur N 100 is a low-viscosity, biuret-free HDI trimer with a well-controlled molecular structure and narrow polydispersity. Unlike monomeric HDI, it offers lower volatility and improved handling safety. Compared to some alternative trimers, it delivers balanced reactivity, pot life, and film formation without requiring additional catalysts in many standard formulations.
Q3: Is Desmodur N 100 suitable for low-VOC or high-solids coating systems?
A: Yes — its low viscosity and high functionality allow formulators to achieve high solids content while maintaining workable rheology. It is commonly used in solventborne and solvent-reduced systems targeting VOC compliance, though compatibility with specific low-VOC solvent blends should be verified experimentally.
Q4: What are typical storage and handling recommendations for Desmodur N 100?
A: Store in tightly sealed containers under dry, inert conditions (e.g., nitrogen blanket) at temperatures between 15–25 °C. Protect from moisture, heat, and direct sunlight. Prolonged exposure to ambient humidity may cause surface haze or gelation due to reaction with water; always use dry handling equipment and ensure substrate and resin components are adequately dried prior to mixing.
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