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High-reactivity aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer.
Low-viscosity liquid formulation enabling excellent processability and easy handling in automated dispensing systems.
Excellent UV stability and color retention—ideal for high-gloss, weather-resistant coatings.
Compatible with a broad range of hydroxyl-functional resins including polyesters, acrylics, and polycarbonate polyols.
Meets stringent VOC regulations due to its solvent-free, low-monomer HDI content (< 0.1 wt%).
Automotive clearcoats and basecoat/clearcoat systems requiring long-term gloss and chip resistance.
Industrial maintenance coatings for machinery, agricultural equipment, and rail vehicles.
High-performance plastic coatings for automotive interior trim and exterior components.
Powder coating hybrid systems where enhanced flow and edge coverage 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) | 2,800 – 3,600 |
| Density at 20 °C (g/cm³) | 1.17 – 1.21 |
| Storage Stability (unopened, 25 °C) | ≥ 12 months |
| Primary Applications | Two-component polyurethane coatings for automotive and industrial use |
Q1: What is the primary chemical nature of Desmodur N 3390 BA SN?
A: Desmodur N 3390 BA SN is an aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI), supplied as a biuret-type HDI trimer in solvent solution. It is designed for ambient- or low-temperature curing applications where excellent weather resistance, low yellowing, and good compatibility with hydroxyl-functional resins are required.
Q2: Which resin systems is Desmodur N 3390 BA SN typically compatible with?
A: It exhibits broad compatibility with hydroxyl-functional acrylics, polyesters, and alkyds. It is especially suited for two-component (2K) high-performance coating systems used in automotive refinish, industrial maintenance, and premium plastic coatings where clarity, gloss retention, and UV stability are critical.
Q3: How does Desmodur N 3390 BA SN differ from standard HDI isocyanurate-based curing agents?
A: Compared to HDI isocyanurates, Desmodur N 3390 BA SN offers lower viscosity and improved flow characteristics due to its biuret structure, enabling easier formulation handling and enhanced film formation at reduced solvent demand. It also provides a more balanced reactivity profile—faster than many isocyanurates at ambient temperatures but with extended pot life under controlled conditions.
Q4: What are the recommended storage and handling precautions?
A: Store in tightly sealed containers under dry, cool conditions (below 30 °C) and protect from moisture, heat, and direct sunlight. Avoid contact with water, alcohols, or amines prior to use, as premature reaction may occur. Use appropriate personal protective equipment (PPE), including nitrile gloves and respiratory protection when handling in non-ventilated areas, consistent with standard industrial hygiene practices for isocyanates.
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