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Aliphatic polyisocyanate-based curing agent offering excellent UV stability and color retention.
Low-viscosity liquid formulation enabling easy handling, precise metering, and efficient mixing with hydroxyl-functional resins.
Fast-reacting system suitable for ambient- and forced-dry curing processes in industrial coating applications.
Provides outstanding chemical resistance, hardness, and mechanical durability in final cured films.
Compliant with REACH and meets stringent VOC emission requirements for high-performance coatings.
Automotive refinish clearcoats and basecoat/clearcoat systems.
Industrial maintenance coatings for machinery, rail vehicles, and agricultural equipment.
High-gloss decorative coatings for architectural metal façades and aluminum composite panels (ACPs).
Plastic coatings requiring flexibility, adhesion, and long-term weatherability.
Wood finishing systems demanding low yellowing and excellent clarity.
| Chemical Type | Aliphatic polyisocyanate (HDI trimer) |
| Product Form | Clear to pale yellow liquid |
| Appearance | Homogeneous, transparent liquid |
| NCO Content (wt %) | Approx. 18.5–19.5% |
| Viscosity (25 °C, mPa·s) | 200–400 |
| Density (20 °C, g/cm³) | 1.18–1.22 |
| Primary Applications | Two-component polyurethane topcoats |
| Key Features | UV-stable, low-yellowing, fast-curing |
Q1: What is the primary chemical nature of Desmodur BL 3175SN?
A: Desmodur BL 3175SN is an aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI), modified to provide improved storage stability and controlled reactivity in two-component polyurethane systems.
Q2: Is Desmodur BL 3175SN suitable for coatings requiring UV resistance and long-term gloss retention?
A: Yes — as an aliphatic isocyanate derivative, it delivers excellent resistance to yellowing and maintains optical clarity and gloss under prolonged UV exposure, making it well-suited for high-performance exterior and transparent topcoats.
Q3: How does Desmodur BL 3175SN compare to standard HDI trimer in terms of pot life and film formation?
A: It offers extended pot life relative to conventional HDI trimers due to its tailored molecular structure, supporting more flexible processing windows while still enabling efficient crosslinking and robust film formation at ambient or moderately elevated temperatures.
Q4: Can Desmodur BL 3175SN be used in low-VOC or high-solids coating formulations?
A: Yes — its low volatility and compatibility with reactive diluents and high-solids resins support formulation strategies aimed at reducing VOC content without compromising cure performance or final film properties.
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