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Aliphatic polyisocyanate trimer with excellent UV stability and low yellowing tendency.
Non-volatile, solvent-free formulation for reduced VOC emissions and improved workplace safety.
High functionality and reactivity enabling fast cure at ambient or elevated temperatures.
Outstanding chemical resistance, particularly to hydrolysis and weathering.
Compatible with a broad range of polyols, including polyester, acrylic, and polycarbonate diols.
High-performance automotive clearcoats and topcoats.
Industrial maintenance coatings for machinery and infrastructure.
UV-resistant architectural coatings for façades and metal cladding.
Precision optical coatings requiring clarity and long-term gloss retention.
Coatings for plastic substrates including ABS and polycarbonate.
| Chemical Type | Aliphatic isocyanurate (HDI-based trimer) |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow transparent liquid |
| NCO Content (wt %) | 15.5 – 16.5 |
| Viscosity at 25 °C (mPa·s) | 2,500 – 4,500 |
| Specific Gravity (20 °C) | 1.18 – 1.22 |
| Storage Stability | Stable under dry, cool conditions (≤25 °C); protect from moisture |
| Primary Applications | Two-component polyurethane coatings requiring high durability and weather resistance |
Q1: What is the primary chemical nature of Desmodur N 3390?
A: Desmodur N 3390 is an aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI), supplied as a biuret-type trimer. It is solvent-free and designed for use in high-performance, light-stable polyurethane coating systems.
Q2: How does Desmodur N 3390 differ from HDI monomer or other HDI trimers?
A: Unlike HDI monomer, Desmodur N 3390 is a pre-reacted, low-volatility trimer with reduced vapor pressure and improved handling safety. Compared to other HDI trimers, it offers a balanced combination of reactivity, viscosity, and film-forming performance—particularly suited for two-component polyurethane coatings requiring excellent weather resistance and gloss retention.
Q3: What types of resins is Desmodur N 3390 typically paired with?
A: It is commonly used with hydroxyl-functional acrylics, polyesters, and alkyds in two-component (2K) polyurethane coating formulations. Its compatibility supports high-gloss, durable finishes for industrial, automotive refinish, and premium wood applications.
Q4: What are key storage and handling considerations?
A: Store in tightly sealed containers under dry, cool conditions (below 30 °C) and protect from moisture, as Desmodur N 3390 reacts readily with water. Use only with appropriate personal protective equipment (PPE), including nitrile gloves and respiratory protection when spraying or handling in poorly ventilated areas.
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E-mail: wangxingqiang@ericwchem.com
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