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Low-viscosity aliphatic polyisocyanate trimer based on hexamethylene diisocyanate (HDI), enabling easy handling and solvent-free or low-solvent formulations.
Excellent weather resistance and UV stability, delivering long-term gloss retention and minimal yellowing in outdoor applications.
Fast-reacting with hydroxyl-functional resins (e.g., polyesters, acrylics, polyethers), supporting efficient ambient- or heat-cure coating processes.
Non-yellowing character suitable for high-performance clearcoats and topcoats requiring optical clarity and color fidelity.
Compliant with major global regulatory frameworks including REACH and VOC-restricted formulations for industrial coatings.
Automotive OEM and refinish clearcoats and basecoat/clearcoat systems.
High-end industrial maintenance coatings for machinery, rail, and agricultural equipment.
Premium wood finishes for furniture, flooring, and architectural millwork.
Plastic coatings for automotive interior trim and consumer electronics housings.
UV-resistant coil coatings for architectural metal panels and roofing substrates.
| Chemical Type | Aliphatic HDI-based isocyanurate trimer |
| Product Form | Liquid |
| Appearance | Clear, pale yellow liquid |
| NCO Content (wt %) | 15.5–16.5% |
| Viscosity at 25 °C (mPa·s) | 800–1200 |
| Density at 20 °C (g/cm³) | 1.18–1.22 |
| VOC Content (g/L) | <100 (as supplied) |
| Storage Stability | ≥12 months at 20–25 °C in sealed containers |
Q1: What is the primary function of Desmodur N 75 MPA X in coating and adhesive formulations?
A: Desmodur N 75 MPA X is a low-viscosity, aliphatic HDI trimer-based polyisocyanate 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 low-bake cure profiles while delivering excellent gloss retention and UV stability.
Q2: How does Desmodur N 75 MPA X differ from standard HDI trimer products like Desmodur N 75?
A: Desmodur N 75 MPA X is a modified version optimized for enhanced compatibility and reduced viscosity in high-solids and solvent-reduced systems. The “MPA X” designation reflects Covestro’s proprietary modification—typically involving controlled uretdione or biuret content adjustment—which improves storage stability and pot life without compromising reactivity or film performance.
Q3: Is Desmodur N 75 MPA X suitable for use in automotive refinish or industrial maintenance coatings?
A: Yes—it is widely used in demanding applications such as automotive refinish clearcoats, plastic coatings, and industrial maintenance topcoats where long-term gloss, color stability, and resistance to chalking or yellowing are critical. Its aliphatic structure ensures minimal UV-induced discoloration compared to aromatic isocyanates.
Q4: What safety and handling considerations apply when working with this curing agent?
A: As with all isocyanate-containing materials, Desmodur N 75 MPA X requires appropriate engineering controls (e.g., local exhaust ventilation), personal protective equipment (chemical-resistant gloves, eye protection, and respiratory protection where airborne concentrations may exceed occupational exposure limits), and strict avoidance of moisture contamination during storage and handling.
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