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Aliphatic isocyanate-based curing agent offering excellent UV stability and color retention.
Low viscosity enables easy handling, precise metering, and efficient mixing with polyol resins.
Fast-reacting system suitable for ambient- and forced-dry curing processes.
Provides outstanding chemical resistance, including to solvents, acids, and alkalis.
Compliant with REACH and meets stringent VOC regulations for industrial coatings.
High-performance automotive clearcoats and basecoats.
Industrial maintenance coatings for machinery and metal structures.
Architectural façade and cladding systems requiring long-term gloss and weather resistance.
Plastic and composite part coatings in transportation and electronics.
Wood finishing systems for premium furniture and interior applications.
| Chemical Type | Aliphatic polyisocyanate (hexamethylene diisocyanate trimer) |
| Product Form | Liquid |
| Appearance | Clear, pale yellow liquid |
| Primary Applications | Two-component polyurethane coatings |
| Key Features | UV-stable, low-VOC, fast-curing, non-yellowing |
| Storage Stability | ≥12 months at 20–25 °C in sealed original container |
| Isocyanate Content (NCO %) | Approx. 13.5–14.2 wt% |
| Viscosity (25 °C) | Approx. 800–1200 mPa·s |
Q1: What is the primary chemical nature of Desmodur IL 1351?
A: Desmodur IL 1351 is an aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI), modified to provide improved storage stability and controlled reactivity in two-component polyurethane systems.
Q2: How does Desmodur IL 1351 differ from standard HDI trimer or biuret curing agents?
A: It features a tailored molecular structure that balances low viscosity, reduced volatility, and enhanced compatibility with hydroxyl-functional resins—offering smoother processing and improved film formation compared to conventional HDI-based crosslinkers.
Q3: Is Desmodur IL 1351 suitable for high-performance coatings requiring UV resistance and gloss retention?
A: Yes—it is widely used in premium industrial and automotive topcoats where excellent weatherability, non-yellowing performance, and long-term gloss stability are essential due to its fully aliphatic isocyanate backbone.
Q4: What types of resins is Desmodur IL 1351 typically formulated with?
A: It demonstrates broad compatibility with hydroxyl-functional acrylics, polyesters, and alkyds, especially in solventborne and high-solids 2K PU coating systems designed for demanding industrial applications.
Q5: How should Desmodur IL 1351 be handled and stored to maintain optimal performance?
A: Store in tightly sealed containers under dry, cool conditions, protected from moisture and ambient humidity. Avoid prolonged exposure to elevated temperatures or direct sunlight to preserve reactivity and shelf life.
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