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Aliphatic polyisocyanate-based curing agent offering excellent UV stability and color retention.
Low-viscosity liquid formulation enabling easy handling, precise metering, and efficient mixing with hydroxyl-functional resins.
Provides outstanding chemical resistance, including to solvents, acids, and cleaning agents.
Delivers superior mechanical properties such as hardness, flexibility, and abrasion resistance in cured films.
Compliant with REACH and meets stringent VOC regulations for industrial coating applications.
High-performance automotive clearcoats and basecoats.
Industrial maintenance coatings for machinery and equipment.
Architectural metal coatings requiring long-term gloss and weather resistance.
Plastic coatings for exterior automotive parts and consumer electronics housings.
Wood coatings for premium furniture and interior architectural elements.
| Chemical Type | Aliphatic polyisocyanate (HDI trimer) |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow transparent liquid |
| NCO Content (wt %) | 19.5 – 20.5% |
| Viscosity at 25 °C | 800 – 1,200 mPa·s |
| Density at 20 °C | 1.16 – 1.18 g/cm³ |
| Flash Point (PMCC) | 145 – 155 °C |
| Solubility | Miscible with common organic solvents (e.g., acetone, ethyl acetate, xylene) |
Q1: What is the primary function of Desmodur N 75 MPA X in polyurethane systems?
A: Desmodur N 75 MPA X is a low-viscosity, aliphatic polyisocyanate-based curing agent designed to react with hydroxyl-functional resins—such as polyols or acrylic polyols—to form durable, weather-resistant polyurethane coatings and adhesives. It enables ambient- or low-bake cure profiles while supporting excellent gloss retention and UV stability.
Q2: Is Desmodur N 75 MPA X compatible with waterborne or high-solids formulations?
A: Yes, it is formulated for compatibility with both solventborne and waterborne polyol systems, including those used in high-solids industrial coatings. Its low viscosity and controlled reactivity support good mixing stability and reduced VOC content in compliant formulations.
Q3: How should Desmodur N 75 MPA X be stored and handled to maintain performance?
A: Store in tightly sealed original containers under dry, cool conditions (ideally below 30 °C) and protect from moisture, heat, and direct sunlight. Exposure to humidity may cause gelation or viscosity increase due to reaction with water; always use dry handling equipment and inert gas blanketing for extended storage.
Q4: Does this curing agent require catalysts for full cure, and what are typical pot life considerations?
A: While Desmodur N 75 MPA X can cure without added catalysts under ambient conditions, tin- or amine-based catalysts are often used to adjust gel time and through-cure speed depending on application requirements. Pot life varies significantly with temperature, humidity, and polyol type—but generally ranges from 4 to 24 hours at 23 °C when mixed with standard acrylic polyols.
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