English
Español
tiếng việt
русский
Aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer, offering excellent UV stability and color retention.
Low-viscosity liquid formulation enabling easy handling, precise metering, and efficient mixing with polyol components.
Non-yellowing performance ideal for high-gloss, weather-resistant topcoats and clear finishes.
Complies with major global VOC regulations, supporting sustainable coating formulations.
Consistent reactivity profile ensures reliable pot life and film formation across diverse processing conditions.
Automotive OEM clearcoats and refinish topcoats.
Industrial maintenance coatings for metal and plastic substrates.
High-performance wood coatings requiring clarity and durability.
Plastic coatings for exterior automotive parts and consumer electronics housings.
Architectural and façade coatings exposed to prolonged sunlight and moisture.
| Chemical Type | Aliphatic HDI-based polyisocyanate (trimer) |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow transparent liquid |
| NCO Content (wt %) | Approx. 15.5–16.5% |
| Viscosity (25 °C, mPa·s) | Approx. 1,800–2,200 |
| Density (20 °C, g/cm³) | Approx. 1.17–1.19 |
| Solvent Content | None (solvent-free) |
| Primary Applications | Two-component polyurethane coatings requiring UV resistance and non-yellowing performance |
Q1: What is Desmodur N 3800 and how does it function in polyurethane systems?
A: Desmodur N 3800 is a low-viscosity, aliphatic polyisocyanate curing agent based on hexamethylene diisocyanate (HDI) trimer. It reacts with hydroxyl-functional resins—such as polyester, acrylic, or polyether polyols—to form durable, weather-resistant polyurethane coatings and adhesives. Its aliphatic structure provides excellent UV stability and minimal yellowing over time.
Q2: Is Desmodur N 3800 suitable for high-solids or solvent-free formulations?
A: Yes, its low viscosity and high functionality make Desmodur N 3800 well-suited for high-solids coating systems and can be incorporated into low-VOC or solvent-reduced formulations. It enables good flow and leveling while maintaining reactivity at ambient or moderately elevated temperatures.
Q3: How should Desmodur N 3800 be stored and handled to maintain stability?
A: Store in tightly sealed containers under dry, inert conditions—preferably under nitrogen—at temperatures between 15°C and 30°C. Avoid exposure to moisture, heat above 40°C, or prolonged contact with air, as these may lead to dimerization, viscosity increase, or gelation over time.
Q4: Can Desmodur N 3800 be used in two-component (2K) automotive refinish coatings?
A: Yes, Desmodur N 3800 is widely used in premium 2K automotive refinish and OEM clearcoats due to its fast cure profile, excellent hardness development, and outstanding gloss and clarity retention—especially where long-term exterior durability and resistance to environmental stress are required.
Contact With Us:
E-mail: wangxingqiang@ericwchem.com
Have a Questions? Call Us:
Add:
Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
