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Aliphatic HDI-based polyisocyanate offering excellent UV stability and minimal yellowing.
Low-viscosity liquid formulation enabling easy handling, precise metering, and efficient mixing with hydroxyl-functional resins.
Fast-reacting at ambient temperature while maintaining extended pot life for industrial coating applications.
Provides outstanding chemical resistance, hardness, and abrasion resistance in cured films.
Compliant with major global VOC regulations and formulated without added solvents or hazardous air pollutants (HAPs).
High-performance automotive clearcoats and basecoat/clearcoat systems.
Industrial maintenance coatings for metal and concrete substrates.
Architectural façade and aluminum composite material (ACM) coatings.
Polyurethane topcoats for wood and plastic substrates requiring gloss retention and weatherability.
Two-component (2K) solventborne and high-solids polyurethane coating systems.
| Chemical Type | Aliphatic polyisocyanate (HDI trimer) |
| Product Form | Liquid |
| Appearance | Clear, colorless to pale yellow liquid |
| NCO Content (wt%) | 15.5–16.5% |
| Viscosity at 25°C (mPa·s) | 800–1,200 |
| Density at 25°C (g/cm³) | 1.18–1.22 |
| VOC Content (g/L) | <100 (as per ASTM D3960) |
| Primary Applications | 2K polyurethane topcoats, clearcoats, and high-durability industrial finishes |
Q1: What is the primary chemical composition of NPU CORONATE HXR-90B?
A: NPU CORONATE HXR-90B is a low-viscosity, aliphatic polyisocyanate curing agent based on hexamethylene diisocyanate (HDI) trimer chemistry. It contains no solvents and is formulated to provide excellent weather resistance, color stability, and compatibility with hydroxyl-functional resins.
Q2: How should NPU CORONATE HXR-90B be stored to maintain its reactivity and shelf life?
A: Store in tightly sealed original containers under dry, cool conditions (ideally below 30°C) and protected from moisture, heat, and direct sunlight. Prolonged exposure to humidity or elevated temperatures may lead to premature gelation or reduced functionality.
Q3: Which resin systems is NPU CORONATE HXR-90B typically compatible with?
A: It is widely used with hydroxyl-functional acrylics, polyesters, and alkyds in two-component polyurethane coatings. Compatibility and cure performance should be verified experimentally for each specific formulation, especially when incorporating additives or alternative resins.
Q4: What are typical handling precautions when working with this isocyanate curing agent?
A: As with all isocyanates, appropriate personal protective equipment (PPE) — including nitrile gloves, chemical-resistant goggles, and respiratory protection — is essential during handling and mixing. Ensure adequate ventilation and avoid skin contact or inhalation of vapors or aerosols.
Q5: How does the pot life of formulations containing NPU CORONATE HXR-90B vary with temperature and resin selection?
A: Pot life decreases significantly at elevated ambient or substrate temperatures and is strongly influenced by the hydroxyl value and acid number of the co-reactive resin. Formulations generally offer usable pot life ranging from several hours at 23°C to substantially shorter durations above 35°C.
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