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Low-viscosity aliphatic polyisocyanate blend offering excellent flow and leveling in coating formulations.
Outstanding UV stability and color retention, ideal for high-durability exterior coatings.
Fast ambient-cure capability with balanced reactivity—enables efficient production without forced drying.
Compatible with a broad range of hydroxyl-functional resins including acrylics, polyesters, and polyester-acrylates.
Low monomeric HDI content (<0.5%), supporting safer handling and compliance with industrial hygiene standards.
Automotive OEM and refinish clearcoats requiring gloss, hardness, and weather resistance.
High-performance industrial maintenance coatings for machinery, rail, and agricultural equipment.
Premium architectural coatings for metal façades, aluminum composite panels (ACPs), and extruded profiles.
Plastic coatings for automotive interior trim and electronic housings demanding low VOC and non-yellowing performance.
Two-component polyurethane wood finishes for furniture and flooring applications.
| Chemical Type | Aliphatic polyisocyanate (HDI-based trimer/uretdione blend) |
| Product Form | Liquid |
| Appearance | Clear, 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) | 1.17–1.19 |
| Flash Point (COC, °C) | 145–155 |
| Storage Stability (unopened, 25°C) | ≥12 months |
Q1: What is the primary chemical composition of CORONATE HX-T?
A: CORONATE HX-T is a low-viscosity, aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry, modified to provide enhanced hydrolytic stability and reduced volatility compared to standard HDI isocyanates.
Q2: How does CORONATE HX-T differ from conventional HDI-based curing agents in terms of performance?
A: CORONATE HX-T offers improved weather resistance, superior gloss retention, and reduced yellowing under UV exposure due to its aliphatic structure. Its tailored molecular architecture also contributes to better compatibility with a wide range of hydroxyl-functional resins and smoother film formation in high-performance coatings.
Q3: What are typical handling and storage recommendations for this product?
A: Store in tightly sealed containers under dry, cool conditions (preferably below 30°C) and protect from moisture, direct sunlight, and contamination. Use appropriate personal protective equipment (PPE), including nitrile gloves and chemical-resistant goggles, as it is a skin and respiratory sensitizer.
Q4: Is CORONATE HX-T suitable for use in low-VOC or high-solids coating systems?
A: Yes — its low viscosity and high functionality allow formulators to achieve target solids content with reduced solvent demand, supporting compliance with evolving VOC regulations. It is commonly used in high-solids, solventborne, and certain solvent-reduced industrial coating formulations.
Q5: How should the stoichiometric ratio be determined when using CORONATE HX-T with hydroxyl-terminated resins?
A: The NCO:OH ratio should be calculated based on the equivalent weights of both components. While typical formulations use an NCO:OH ratio between 0.8:1 and 1.2:1 depending on desired crosslink density and film properties, final optimization requires empirical testing within the specific resin system and application conditions.
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