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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 resistance to solvents, acids, and alkalis in cured coatings.
Complies with REACH and meets stringent VOC regulations for industrial coating applications.
Enables fast ambient or low-bake cure profiles without compromising film hardness or gloss development.
High-performance automotive refinish clearcoats and basecoats.
Industrial maintenance coatings for metal substrates in transportation and infrastructure sectors.
Powder coating hybrid systems requiring improved flexibility and impact resistance.
Architectural and façade coatings demanding long-term weatherability and gloss retention.
Plastic coatings for exterior automotive components and consumer electronics housings.
| Chemical Type | Aliphatic polyisocyanate (hexamethylene diisocyanate–based) |
| Product Form | Clear, low-viscosity liquid |
| Appearance | Colorless to pale yellow, transparent 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 |
| Solvent Content | Acetate-based (non-halogenated) |
| Primary Applications | Two-component polyurethane coatings for high-durability finishes |
Q1: What is the primary function of Desmodur N 3790 BA in coating and adhesive formulations?
A: Desmodur N 3790 BA is a low-viscosity, aliphatic polyisocyanate curing agent designed to react with hydroxyl-functional resins—such as polyesters, acrylics, or polyethers—to form durable, weather-resistant polyurethane networks. It enables ambient- or low-bake cure profiles while supporting excellent gloss retention and UV stability.
Q2: Is Desmodur N 3790 BA suitable for high-solids or solvent-reduced systems?
A: Yes—it is formulated specifically for high-solids applications due to its low viscosity and high NCO content, allowing efficient resin crosslinking without excessive solvent dilution. Its compatibility supports formulation flexibility across a range of VOC-compliant systems.
Q3: How does Desmodur N 3790 BA compare to aromatic isocyanate curing agents in terms of performance and handling?
A: Unlike aromatic alternatives, Desmodur N 3790 BA offers superior lightfastness and non-yellowing properties, making it ideal for topcoats and clear finishes exposed to outdoor conditions. It also exhibits lower volatility and improved handling safety, though standard PPE and ventilation remain essential during use.
Q4: What storage conditions are recommended to maintain product stability?
A: Store in tightly sealed original containers under dry, cool conditions (ideally below 30 °C) and protect from moisture, direct sunlight, and prolonged exposure to ambient humidity. Avoid freezing, and always inspect for signs of crystallization or cloudiness before use.
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