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Low-viscosity aliphatic polyisocyanate trimer offering excellent storage stability and extended pot life.
Non-yellowing performance ideal for high-gloss, weather-resistant topcoats and clearcoats.
High functionality and reactivity with hydroxyl-terminated resins (e.g., polyesters, acrylics, polycarbonates).
Compliant with major global VOC regulations due to low monomer content and absence of solvents.
Consistent batch-to-batch quality ensured by Covestro’s certified ISO 9001 manufacturing process.
Automotive OEM and refinish clearcoats requiring superior UV resistance and gloss retention.
Industrial maintenance coatings for machinery, agricultural equipment, and rail vehicles.
High-performance wood coatings including furniture, flooring, and architectural millwork finishes.
Plastic coatings for ABS, PC, and PC/ABS substrates in electronics and consumer goods.
| Chemical Type | Aliphatic HDI-based isocyanurate trimer |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow, transparent liquid |
| NCO Content (wt %) | Approx. 15.5–16.5% |
| Viscosity at 25°C (mPa·s) | 800–1,200 |
| Density at 20°C (g/cm³) | 1.17–1.19 |
| Monomeric HDI Content (wt %) | < 0.5% |
| Storage Stability (unopened, 25°C) | ≥ 12 months |
Q1: What is the primary functional role of Desmodur N 3390 BA SN in coating and adhesive formulations?
A: Desmodur N 3390 BA SN is a low-viscosity, aliphatic HDI-based trimer isocyanate curing agent designed to react with hydroxyl-functional resins (e.g., polyesters, acrylics, or polyethers) to form durable, weather-resistant polyurethane networks. It enables ambient- or forced-dry crosslinking with excellent gloss retention, color stability, and resistance to UV exposure and yellowing.
Q2: How does the BA SN grade differ from standard Desmodur N 3390?
A: The “BA SN” designation indicates a specific batch-controlled variant optimized for enhanced storage stability and consistent reactivity profile. It features tightly controlled monomer content and viscosity specifications, making it particularly suitable for high-solids and low-VOC formulations where reproducibility and pot life management are critical.
Q3: What are typical handling and storage recommendations for this product?
A: Desmodur N 3390 BA SN should be stored in tightly sealed containers under dry, inert conditions (e.g., nitrogen blanket) at temperatures between 15–25 °C. Exposure to moisture, humidity, or elevated temperatures must be avoided to prevent premature dimerization or gelation. Containers should remain closed when not in use, and transfer equipment must be thoroughly dried before contact.
Q4: Is Desmodur N 3390 BA SN compatible with common catalysts used in two-component polyurethane systems?
A: Yes — it is compatible with standard tertiary amine and organometallic catalysts (e.g., dibutyltin dilaurate or zinc octoate), though catalyst selection and dosage should be optimized based on desired pot life, cure speed, and film properties. Strongly acidic additives or highly reactive catalysts may reduce working time and require formulation adjustment.
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