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Aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry.
Low volatility and reduced monomer content for improved occupational safety and regulatory compliance.
Excellent compatibility with hydroxyl-functional acrylic, polyester, and polyol resins.
Provides outstanding UV stability, gloss retention, and weather resistance in cured coatings.
Designed for ambient- and forced-dry curing systems with balanced reactivity and pot life.
High-performance automotive OEM and refinish clearcoats.
Industrial maintenance coatings for metal and plastic substrates.
Architectural and façade coatings requiring long-term color and gloss stability.
Plastic coatings for exterior automotive parts and consumer electronics housings.
Two-component polyurethane topcoats for wood and composite surfaces.
| Chemical Type | Aliphatic HDI-based polyisocyanate (trimer) |
| Product Form | Liquid |
| Appearance | Clear, pale yellow liquid |
| NCO Content (wt %) | 19.5–20.5% |
| Viscosity (25 °C, mPa·s) | 800–1200 |
| Density (20 °C, g/cm³) | 1.16–1.19 |
| Storage Stability | ≥12 months at ≤25 °C in sealed containers |
| VOC Content (g/L) | ≤100 (as per ISO 11890-2) |
Q1: What is the primary chemical nature of EP-HP2333?
A: EP-HP2333 is a low-viscosity, aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry, designed for high-performance two-component polyurethane systems requiring excellent weather resistance and minimal yellowing.
Q2: Which types of resins is EP-HP2333 typically compatible with?
A: EP-HP2333 is formulated to react efficiently with hydroxyl-functional resins including acrylics, polyesters, and polyethers — especially in high-solids and solventborne coatings for industrial and protective applications.
Q3: How does EP-HP2333 contribute to film performance in cured coatings?
A: It delivers enhanced crosslink density, resulting in improved hardness, chemical resistance, and mechanical durability while maintaining flexibility and gloss retention — particularly valuable in demanding outdoor and automotive refinish environments.
Q4: What are key handling and storage recommendations?
A: EP-HP2333 should be stored in tightly sealed containers under dry, cool conditions away from moisture, heat, and direct sunlight. It is moisture-sensitive and requires strict exclusion of water during handling to prevent premature gelation or CO₂ formation.
Q5: Can EP-HP2333 be used in low-VOC formulations?
A: Yes — its low viscosity and high functionality allow formulators to achieve target solids content with reduced solvent demand, supporting compliance with evolving low-VOC regulatory frameworks without compromising cure speed or final film properties.
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