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High-reactivity aliphatic isocyanate offering excellent weather resistance and UV stability.
Low-viscosity liquid formulation enabling easy handling, precise metering, and homogeneous mixing with polyol components.
Non-yellowing performance ideal for topcoats and clear-coat applications requiring long-term gloss and color retention.
Compatible with a broad range of hydroxyl-functional resins including acrylics, polyesters, and polyester-polyols.
Meets stringent VOC regulations with negligible volatile organic compound emissions when formulated appropriately.
Automotive OEM and refinish clearcoats and basecoat/clearcoat systems.
Industrial maintenance coatings for metal and plastic substrates.
High-performance architectural coatings for façades and exterior cladding.
Precision coil coatings requiring rapid cure response and durable film formation.
Specialty protective coatings for aerospace and rail transportation components.
| Chemical Type | Aliphatic polyisocyanate (hexamethylene diisocyanate-based trimer) |
| Product Form | Liquid |
| Appearance | Clear, pale yellow to colorless liquid |
| NCO Content (wt%) | 18.5 – 19.5% |
| Viscosity at 25°C (mPa·s) | 800 – 1,200 |
| Density at 25°C (g/cm³) | 1.18 – 1.22 |
| Flash Point (°C, closed cup) | 145 – 155 |
| Storage Stability | Stable for ≥12 months at 15–25°C in original sealed container |
Q1: What is the primary function of NPU CORONATE HXR in coating and adhesive formulations?
A: NPU CORONATE HXR is a low-viscosity, aliphatic polyisocyanate curing agent designed to react with hydroxyl-functional resins—such as polyesters, acrylics, or polyethers—to form durable, chemically resistant polyurethane networks. It enables ambient- or heat-cured crosslinking with excellent gloss retention and weatherability.
Q2: How does NPU CORONATE HXR differ from aromatic isocyanate curing agents?
A: Unlike aromatic isocyanates, NPU CORONATE HXR is based on aliphatic chemistry, which provides superior UV stability, resistance to yellowing, and long-term color retention—making it especially suitable for high-performance topcoats, clearcoats, and outdoor applications where aesthetic durability is critical.
Q3: What are the recommended storage conditions for this product?
A: Store in tightly sealed original containers under dry, cool conditions (ideally below 30 °C) and protect from moisture, direct sunlight, and contamination. Prolonged exposure to humidity or ambient air may cause gelation due to reaction with water; always use dry handling equipment and inert gas blanketing when practical.
Q4: Can NPU CORONATE HXR be used in solvent-free or high-solids systems?
A: Yes—it is formulated for compatibility with low-VOC and high-solids coating systems. Its relatively low viscosity and controlled reactivity support good mixing efficiency and extended pot life in formulations targeting reduced solvent content, though final suitability depends on resin selection and processing conditions.
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E-mail: wangxingqiang@ericwchem.com
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