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Aliphatic polyisocyanate-based curing agent offering excellent UV stability and color retention.
Low-viscosity liquid formulation enabling easy handling, precise metering, and efficient mixing with hydroxyl-functional resins.
Provides outstanding chemical resistance, including to solvents, acids, and alkalis, in cured coatings.
Enables rapid ambient- or forced-dry curing with balanced reactivity for robust film formation.
Complies with REACH and meets VOC regulations for industrial coating applications.
Automotive clearcoats and OEM topcoats requiring high gloss and long-term weatherability.
Industrial maintenance coatings for machinery, metal furniture, and agricultural equipment.
Plastic coatings for exterior automotive parts and consumer electronics housings.
High-performance coil coatings where durability and process efficiency are critical.
Wood coatings for premium interior and exterior architectural millwork.
| Chemical Type | Aliphatic polyisocyanate (hexamethylene diisocyanate–based) |
| Product Form | Liquid |
| Appearance | Clear, pale yellow liquid |
| NCO Content (wt%) | 15.5 – 16.5 |
| Viscosity at 25°C (mPa·s) | 800 – 1,200 |
| Density at 20°C (g/cm³) | 1.17 – 1.21 |
| VOC Content (g/L) | < 50 (as per ISO 11890-2) |
| Storage Stability | At least 12 months in original sealed container at 15–25°C |
Q1: What is the primary chemical nature of Desmodur N 3600?
A: Desmodur N 3600 is an aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI), modified to provide improved handling characteristics and reduced volatility compared to standard HDI trimer.
Q2: Is Desmodur N 3600 suitable for coatings requiring UV stability and color retention?
A: Yes — as an aliphatic isocyanate, Desmodur N 3600 delivers excellent resistance to UV-induced yellowing and gloss loss, making it well-suited for high-performance clearcoats and topcoats exposed to outdoor conditions.
Q3: How does Desmodur N 3600 compare to other HDI-based curing agents in terms of viscosity and pot life?
A: Desmodur N 3600 offers a balanced combination of low-to-moderate viscosity and extended pot life at ambient temperatures, supporting easier formulation and application without sacrificing reactivity during cure.
Q4: Can Desmodur N 3600 be used in solvent-free or high-solids coating systems?
A: Yes — its tailored molecular structure and low volatility allow effective use in high-solids, low-VOC, and certain solvent-free polyurethane coating formulations, subject to compatibility testing with the selected resin system.
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