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Exceptional lightfastness and UV resistance for long-term color stability in demanding outdoor applications.
Low-viscosity liquid formulation enabling easy handling, precise metering, and homogeneous mixing with polyols.
Excellent compatibility with aliphatic polyisocyanates and standard polyester/polyacrylate polyols.
Fast-curing performance at ambient and elevated temperatures without compromising film flexibility or gloss retention.
Non-yellowing chemistry ideal for high-clarity, white, and pastel-colored coatings requiring optical purity.
Automotive clearcoats and OEM topcoats requiring superior weatherability and gloss retention.
High-end architectural and industrial maintenance coatings for façades, bridges, and metal cladding.
Powder coating hybrid systems where enhanced flow and reduced curing temperature are critical.
UV-resistant wood finishes for exterior furniture, decking, and joinery applications.
Specialty plastic coatings for outdoor signage, lighting housings, and consumer electronics enclosures.
| Chemical Type | Aliphatic polyisocyanate (hexamethylene diisocyanate-based trimer) |
| Product Form | Liquid |
| Appearance | Clear, pale yellow to colorless liquid |
| NCO Content (wt %) | 15.5 – 16.5 |
| Viscosity at 25 °C (mPa·s) | 800 – 1,200 |
| Density at 20 °C (g/cm³) | 1.19 – 1.23 |
| Solvent Content (wt %) | None (solvent-free) |
| Storage Stability | ≥12 months at 20–25 °C in sealed original container |
Q1: What is the primary function of Desmodur N 100 in coating and adhesive formulations?
A: Desmodur N 100 is a lightfast aliphatic polyisocyanate curing agent designed to react with hydroxyl-functional resins—such as polyesters, acrylics, or polyethers—to form durable, UV-stable polyurethane networks. Its key role is to enhance crosslink density, improving hardness, chemical resistance, and long-term gloss retention without yellowing under exposure to light.
Q2: How does Desmodur N 100 differ from aromatic isocyanate curing agents like Desmodur N 3300?
A: Unlike aromatic isocyanates, Desmodur N 100 is based on aliphatic chemistry—specifically hexamethylene diisocyanate (HDI) trimer—which provides exceptional lightfastness and non-yellowing performance. This makes it suitable for topcoats and clear finishes where color stability and clarity are critical, whereas aromatic alternatives may discolor upon UV exposure.
Q3: Is Desmodur N 100 compatible with moisture-cure or one-component systems?
A: No—Desmodur N 100 is formulated for two-component (2K) polyurethane systems requiring separate mixing with OH-functional components. It is not intended for moisture-cure applications, as its reactivity is optimized for controlled stoichiometric reaction with polyols rather than ambient humidity.
Q4: What storage conditions are recommended to maintain product stability?
A: Store in tightly sealed original containers under dry, cool conditions (typically below 30 °C), protected from moisture, heat, and direct sunlight. Prolonged exposure to humidity or elevated temperatures may lead to viscosity increase or gelation due to premature reaction with water or self-polymerization.
Q5: Can Desmodur N 100 be used in low-VOC or high-solids formulations?
A: Yes—Desmodur N 100 is commonly employed in solventborne, high-solids, and certain solvent-reduced systems. Its relatively low viscosity and good compatibility with common organic solvents support formulation flexibility while helping meet VOC reduction targets without compromising film formation or cure performance.
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E-mail: wangxingqiang@ericwchem.com
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