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Aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI), offering excellent UV stability and color retention.
Low-viscosity, solvent-free liquid formulation enabling easy handling and precise metering in automated systems.
Fast-reacting with polyols to deliver robust crosslinking, supporting short-cycle production in industrial coatings.
Compliant with REACH and meets stringent VOC regulations for sustainable coating formulations.
Consistent batch-to-batch quality backed by Covestro’s global manufacturing standards and traceability.
Aerospace exterior topcoats requiring long-term gloss retention and weather resistance.
Automotive clearcoats and OEM refinish systems demanding high hardness and scratch resistance.
Industrial maintenance coatings for rail, wind turbine blades, and construction equipment.
High-performance plastic coatings for automotive trim and consumer electronics housings.
Two-component polyurethane (2K PU) systems used in premium wood and furniture finishes.
| Chemical Type | Aliphatic HDI-based polyisocyanate (trimer) |
| Product Form | Liquid |
| Appearance | Clear, pale yellow to colorless liquid |
| NCO Content (wt %) | 21.0 – 22.0 |
| Viscosity at 25 °C (mPa·s) | 300 – 500 |
| Density at 20 °C (g/cm³) | 1.18 – 1.22 |
| Flash Point (PMCC, °C) | 165 – 175 |
| Storage Stability (unopened, 25 °C) | ≥ 12 months |
Q1: What is the primary function of Desmodur N 75MPA X in polyurethane systems?
A: Desmodur N 75MPA X is a low-viscosity, aliphatic polyisocyanate curing agent designed to react with hydroxyl-functional resins—such as polyols or acrylic polyols—to form crosslinked polyurethane coatings, adhesives, and sealants. It contributes to excellent weather resistance, gloss retention, and mechanical durability.
Q2: How does Desmodur N 75MPA X differ from aromatic isocyanate curing agents like Desmodur N 3300?
A: Unlike aromatic isocyanates, Desmodur N 75MPA X is based on aliphatic hexamethylene diisocyanate (HDI) trimer chemistry, offering superior UV stability and resistance to yellowing. This makes it especially suitable for topcoats and outdoor applications where long-term color and clarity are critical.
Q3: What are typical handling and storage recommendations for this product?
A: Desmodur N 75MPA X should be stored in tightly sealed containers under dry, cool conditions (typically below 30 °C), protected from moisture and direct sunlight. Due to its reactivity with water, exposure to humidity may cause gelation or CO₂ evolution; therefore, strict moisture control during handling and processing is essential.
Q4: Can Desmodur N 75MPA X be used in solvent-free or high-solids formulations?
A: Yes, its low viscosity and good compatibility with a wide range of polyols enable formulation flexibility—including high-solids, low-VOC, and solvent-free systems—without requiring excessive dilution, supporting sustainable coating design goals.
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