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Aliphatic HDI-based polyisocyanate offering excellent UV stability and minimal yellowing over time.
Low-viscosity liquid formulation enabling easy handling, precise metering, and efficient mixing with polyols.
Contains no solvents or volatile organic compounds (VOC-free), supporting sustainable coating systems.
Provides fast ambient- or heat-cure reactivity for high-throughput industrial finishing applications.
Delivers superior mechanical properties including abrasion resistance, hardness, and chemical resistance in cured films.
High-performance clearcoats for automotive OEM and refinish coatings.
Durable topcoats for plastic substrates in electronics and consumer goods.
Industrial maintenance coatings for metal and concrete surfaces requiring long-term gloss retention.
Two-component polyurethane systems for wood and furniture finishes.
| Chemical Type | Aliphatic polyisocyanate (HDI trimer) |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow transparent liquid |
| NCO Content (wt %) | Approx. 18.5–19.5% |
| Viscosity at 25 °C (mPa·s) | Approx. 1,800–2,400 |
| Density at 20 °C (g/cm³) | Approx. 1.20–1.23 |
| Flash Point (PMCC, °C) | Approx. 145–155 |
| Primary Applications | 2K PU clearcoats, plastic coatings, industrial maintenance coatings |
Q1: What is the primary chemical nature and functional role of Desmodur IL 1351 in coating and adhesive formulations?
A: Desmodur IL 1351 is a low-viscosity, aliphatic isocyanate curing agent based on hexamethylene diisocyanate (HDI) trimer chemistry. It functions as a crosslinker for hydroxyl-terminated resins—such as polyesters, polyacrylates, and polyethers—enabling ambient or thermally activated formation of durable, weather-resistant polyurethane networks.
Q2: How does Desmodur IL 1351 compare to other HDI-based trimers in terms of reactivity and pot life?
A: Desmodur IL 1351 exhibits moderate reactivity under ambient conditions, offering extended pot life compared to more reactive isocyanates—especially when formulated with standard polyester or acrylic polyols. Its stability supports practical working times in industrial spray and coil coating applications, while still enabling efficient cure at elevated temperatures.
Q3: Is Desmodur IL 1351 suitable for use in high-solids or solvent-reduced systems?
A: Yes—it is specifically designed for compatibility with high-solids and low-VOC coating systems. Its low viscosity and good solubility in common organic solvents (e.g., acetates, ketones, glycol ethers) facilitate formulation flexibility without requiring excessive diluent addition.
Q4: What safety and handling considerations apply during processing?
A: As with all isocyanates, Desmodur IL 1351 requires appropriate occupational hygiene measures—including adequate ventilation, personal protective equipment (gloves, goggles, respiratory protection where aerosol or vapor exposure is possible), and avoidance of moisture contact to prevent CO₂ evolution and gelation. Storage should be under dry, inert conditions to maintain stability.
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