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Low-viscosity aliphatic isocyanate trimer offering excellent storage stability and handling safety.
Non-yellowing performance ideal for high-gloss, weather-resistant topcoats and clear finishes.
Fast-reacting with polyols to deliver robust crosslink density and superior chemical resistance.
Compliant with REACH and meets stringent VOC regulations for industrial coating systems.
Consistent batch-to-batch quality ensured by Covestro’s certified production process.
Aerospace exterior and interior coatings requiring UV stability and low outgassing.
Automotive OEM and refinish clearcoats demanding high gloss and scratch resistance.
Industrial maintenance coatings for metal structures exposed to harsh outdoor environments.
High-performance plastic coatings for automotive trim and electronic housings.
| Chemical Type | Aliphatic HDI-based isocyanurate trimer |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow transparent liquid |
| NCO Content (wt %) | 18.5 – 19.5 |
| Viscosity at 25 °C (mPa·s) | 1,200 – 1,600 |
| Density at 20 °C (g/cm³) | 1.17 – 1.21 |
| Storage Stability | ≥12 months at ≤25 °C in sealed original container |
| Primary Applications | Two-component polyurethane coatings and clearcoats |
Q1: What is the primary function of Desmodur N 3790 BA in coating formulations?
A: Desmodur N 3790 BA is a low-viscosity, HDI-based trimer isocyanate curing agent designed to react with hydroxyl-functional resins—such as acrylics, polyesters, or alkyds—to form durable, chemically resistant polyurethane coatings. It enables ambient- or forced-dry crosslinking with excellent gloss retention and weather stability.
Q2: How does Desmodur N 3790 BA compare to other HDI trimers in terms of viscosity and handling?
A: Desmodur N 3790 BA offers notably lower viscosity than many conventional HDI trimer products, facilitating easier incorporation into solventborne and high-solids coating systems without excessive thinning. Its consistent fluidity supports efficient mixing, extended pot life, and improved spray atomization in industrial applications.
Q3: Is Desmodur N 3790 BA suitable for low-VOC or high-solids coating systems?
A: Yes—its low volatility and high functionality make it well-suited for high-solids, low-VOC, and solvent-reduced formulations. It contributes minimal monomeric HDI content and supports compliance with evolving regulatory expectations for reduced emissions in industrial finishing.
Q4: What are typical storage and handling recommendations 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 isocyanates are moisture-sensitive. Use appropriate PPE—including nitrile gloves, safety goggles, and respiratory protection when aerosols or vapors may be present.
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