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Low-viscosity aliphatic polyisocyanate trimer offering excellent storage stability and handling safety.
Non-yellowing performance ideal for high-gloss, weather-resistant topcoats in demanding outdoor applications.
High functionality and reactivity with hydroxyl-containing resins (e.g., polyesters, acrylics, polyethers) enabling fast ambient or forced-dry curing.
Compliant with major global VOC regulations including EU Directive 2004/42/EC and US EPA standards for architectural and industrial coatings.
Consistent batch-to-batch quality supported by Covestro’s stringent GMP-aligned manufacturing controls.
Automotive clearcoats and basecoats requiring exceptional gloss retention and UV resistance.
Industrial maintenance coatings for machinery, rail vehicles, and agricultural equipment.
High-performance wood finishes for premium furniture and interior architectural elements.
Aerospace interior coatings where low volatility, non-yellowing properties, and adhesion to composites are critical.
| 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) | 155–165 |
| Storage Stability (unopened, 25 °C) | ≥12 months |
Q1: What is the primary function of Desmodur N 3900 in coating and adhesive formulations?
A: Desmodur N 3900 is a low-viscosity, aliphatic HDI trimer-based polyisocyanate curing agent designed to react with hydroxyl-functional resins (e.g., acrylics, polyesters, or polyethers) to form durable, weather-resistant, and chemically stable polyurethane networks. It enables ambient- or forced-dry crosslinking with excellent gloss retention and minimal yellowing.
Q2: How does Desmodur N 3900 compare to other HDI trimer products in terms of viscosity and handling?
A: Desmodur N 3900 offers notably lower viscosity than many conventional HDI trimers, facilitating easier incorporation into high-solids and solvent-reduced systems without excessive dilution. Its consistent rheology supports efficient mixing, extended pot life, and improved sprayability in industrial coating applications.
Q3: Is Desmodur N 3900 suitable for use in food-contact or indoor air-sensitive applications?
A: Desmodur N 3900 is formulated to support low-VOC and low-emission systems when used in accordance with recommended cure schedules. While it is not inherently approved for direct food contact, it is widely employed in coatings for interior architectural surfaces, furniture, and transportation interiors where low odor and compliance with general indoor air quality guidelines are required.
Q4: What are typical storage and handling precautions for this product?
A: Store in tightly sealed containers under dry, cool conditions (preferably below 30 °C) and protect from moisture, heat, and direct sunlight. Avoid exposure to ambient humidity during handling, as moisture can cause gelation or CO₂ evolution. Use only with appropriate personal protective equipment (PPE), including nitrile gloves and respiratory protection when aerosols or vapors may be generated.
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