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High chemical purity with low monomer content for enhanced storage stability and reduced volatility.
Excellent hydrolytic resistance due to sterically hindered hexamethylene diisocyanate (HMDI) structure.
Low color development and superior UV stability, ideal for light-sensitive coating systems.
Controlled reactivity profile enabling precise pot life management in two-component polyurethane formulations.
Compatible with a broad range of polyols including polyester, polyether, and acrylic types.
High-performance automotive clearcoats and basecoats requiring gloss retention and weather resistance.
Premium industrial maintenance coatings for metal and concrete substrates.
UV-resistant wood finishes and furniture coatings demanding long-term clarity and hardness.
Electronics encapsulation and protective conformal coatings requiring low outgassing and thermal stability.
Specialty adhesives and sealants where low yellowing and high bond durability are critical.
| Chemical Type | Hexamethylene Diisocyanate (HMDI)-based aliphatic isocyanate |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow transparent liquid |
| NCO Content (wt%) | 19.5–20.5 |
| Viscosity at 25°C (mPa·s) | 80–120 |
| Density at 25°C (g/cm³) | 1.07–1.10 |
| Flash Point (°C, closed cup) | 145–155 |
| Storage Stability (unopened, 25°C) | ≥12 months |
Q1: What distinguishes WANHUA WANNATE HMDI from other aliphatic isocyanate curing agents?
A: WANHUA WANNATE HMDI is based on hexamethylene diisocyanate (HMDI), offering excellent hydrolytic stability, low volatility, and superior compatibility with a wide range of polyols and resins—particularly beneficial for high-performance coatings requiring long pot life and consistent film formation.
Q2: How should this curing agent be handled and stored to maintain performance?
A: Store in tightly sealed containers under dry, cool conditions (preferably below 30°C) and protect from moisture, direct sunlight, and ambient humidity. Always use dry, inert gas blanketing during transfer or prolonged storage to prevent premature dimerization or uretdione formation.
Q3: Is WANHUA WANNATE HMDI suitable for two-component waterborne coating systems?
A: Yes—it is widely used as a crosslinker in 2K waterborne polyurethane systems, especially where low VOC content, good hardness development, and resistance to yellowing are required. Compatibility and dispersion stability should be verified during formulation development.
Q4: What is the typical NCO content range and how does it affect formulation design?
A: As an HMDI-based product, it delivers moderate NCO functionality and reactivity—generally ranging from 0.1% to 2% by weight in final formulations, depending on desired cure speed, flexibility, and end-use performance requirements. Its balanced reactivity supports both ambient- and forced-dry applications without excessive sensitivity to ambient humidity.
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