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Low-viscosity aliphatic polyisocyanate blend designed for ambient or low-bake curing.
Excellent UV stability and color retention in demanding outdoor applications.
Good compatibility with hydroxyl-functional acrylics, polyesters, and polyols.
Enables high-gloss, scratch-resistant coatings with balanced pot life and film formation.
Free of solvents and NMP (N-methyl-2-pyrrolidone), supporting sustainable formulation strategies.
Automotive clearcoats and topcoats for OEM and refinish systems.
High-performance industrial maintenance coatings for metal and plastic substrates.
Architectural and façade coatings requiring long-term gloss and weather resistance.
UV-stable wood coatings for interior and exterior furniture and flooring.
Specialty protective coatings for transportation equipment and agricultural machinery.
| Chemical Type | Aliphatic polyisocyanate (HDI-based trimer) |
| Product Form | Liquid |
| Appearance | Clear, colorless to pale yellow liquid |
| NCO Content (wt %) | 11.8 – 12.2% |
| Viscosity at 25 °C | 1,000 – 1,400 mPa·s |
| Density at 20 °C | 1.16 – 1.18 g/cm³ |
| Flash Point (PMCC) | 135 – 140 °C |
| Storage Stability (unopened, 25 °C) | ≥ 12 months |
Q1: What is Desmodur L 75, and how does it differ from other aliphatic polyisocyanates?
A: Desmodur L 75 is a low-viscosity, aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer. It offers excellent weather resistance, light stability, and compatibility with common hydroxyl-functional resins—making it especially suitable for high-performance coatings where long-term gloss retention and color stability are critical. Unlike aromatic isocyanates, it does not yellow upon UV exposure.
Q2: Is Desmodur L 75 compatible with waterborne hydroxyl-functional resins?
A: Yes, Desmodur L 75 is widely used in waterborne two-component polyurethane systems. It can be formulated as an emulsifiable or dispersible curing agent, often with the aid of appropriate surfactants or hydrophilic modifications, to ensure stable dispersion and efficient crosslinking in aqueous environments.
Q3: What is the typical pot life of formulations using Desmodur L 75?
A: Pot life depends strongly on formulation variables—including resin type, catalyst presence, temperature, and moisture content—but generally ranges from several hours to over 24 hours at ambient conditions when properly formulated with standard polyester or acrylic polyols. Its low reactivity toward moisture helps extend working time compared to more hydrophilic isocyanates.
Q4: Can Desmodur L 75 be used in low-VOC or high-solids coating systems?
A: Yes, its low viscosity and high functionality allow formulators to achieve high solids content while maintaining workable rheology—reducing the need for reactive diluents or volatile solvents. It supports compliance with modern VOC regulations when incorporated into carefully balanced, solvent-minimized or solvent-free systems.
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