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Aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry.
Low-viscosity liquid offering excellent compatibility with common polyol resins and ease of handling in industrial coating systems.
Provides outstanding UV stability and color retention in demanding outdoor applications.
Enables fast ambient-cure or forced-dry performance with balanced pot life and film formation.
Compliant with REACH and meets stringent VOC regulations for high-performance industrial coatings.
Automotive OEM and refinish clearcoats requiring gloss, hardness, and weather resistance.
Industrial maintenance coatings for machinery, rail vehicles, and agricultural equipment.
High-end architectural façade coatings exposed to prolonged solar irradiation.
Precision plastic coatings for electronics housings and consumer appliances.
Two-component polyurethane floor coatings in commercial and industrial settings.
| Chemical Type | Aliphatic HDI-based polyisocyanate (trimer) |
| Product Form | Clear, low-viscosity liquid |
| Appearance | Colorless to pale yellow, transparent |
| NCO Content (wt %) | 21.5–22.5% |
| Viscosity at 25°C (mPa·s) | 800–1,200 |
| Density at 20°C (g/cm³) | 1.19–1.21 |
| VOC Content (g/L) | <100 (as per EU Directive 2004/42/EC) |
| Storage Stability | 12 months minimum at 15–25°C in sealed containers |
Q1: What is the primary function of BF1540 in coating and adhesive formulations?
A: BF1540 is a low-viscosity, aliphatic polyisocyanate curing agent designed to react with hydroxyl-functional resins—such as polyesters, acrylics, or polyethers—to form durable, crosslinked thermoset networks. It delivers excellent weather resistance, gloss retention, and mechanical performance in high-performance two-component systems.
Q2: How does BF1540 compare to aromatic isocyanates in terms of yellowing and UV stability?
A: As an aliphatic isocyanate, BF1540 offers superior UV stability and non-yellowing characteristics compared to aromatic alternatives like TDI or MDI. This makes it particularly suitable for exterior applications where long-term color fidelity and clarity are critical, such as automotive clearcoats and architectural coatings.
Q3: What is the typical pot life when BF1540 is mixed with common OH-functional resins?
A: Pot life varies depending on resin type, NCO:OH ratio, temperature, and catalyst presence—but generally ranges from several hours to over 24 hours at ambient conditions. Its controlled reactivity supports flexible processing windows without premature gelation.
Q4: Is BF1540 compatible with moisture-cure or one-component systems?
A: No—BF1540 is formulated exclusively for two-component (2K) systems requiring stoichiometric mixing with hydroxyl-terminated resins. It is not intended for moisture-cure applications, as its reactivity is optimized for controlled NCO–OH reactions rather than ambient humidity-driven curing.
Q5: How should BF1540 be stored to maintain optimal performance?
A: Store in tightly sealed containers under dry, inert atmosphere (e.g., nitrogen blanket) at temperatures between 10 °C and 30 °C. Prolonged exposure to moisture, heat, or ambient air may lead to dimerization or urea formation, affecting reactivity and shelf life.
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