Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Covestro Desmodur BL 3175 SN Curing Agent

Covestro Desmodur BL 3175 SN is a low-viscosity aliphatic polyisocyanate curing agent from the Desmodur BL series, designed for high-performance two-component polyurethane coatings requiring excellent weather resistance, gloss retention, and fast cure at ambient temperatures.
  • covestro desmodur bl 3175 sn curing agent_ebdb46b1
  • covestro desmodur bl 3175 sn curing agent_ebdb46b1

Features Of Covestro Desmodur BL 3175 SN Curing Agent

  1. Aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI), offering excellent UV stability and color retention.

  2. Low-viscosity liquid formulation enabling easy handling, precise metering, and compatibility with standard spray and mixing equipment.

  3. Non-yellowing performance ideal for high-gloss and transparent topcoats in demanding aesthetic applications.

  4. Optimized reactivity profile for balanced pot life and rapid film formation at ambient or low-bake conditions.

  5. Complies with major global VOC regulations and supports sustainable coating formulations with reduced solvent demand.

Typical Applications Of Covestro Desmodur BL 3175 SN Curing Agent

  1. Automotive clearcoats and basecoat/clearcoat systems requiring long-term gloss and weather resistance.

  2. Industrial maintenance coatings for machinery, agricultural equipment, and metal furniture.

  3. High-performance wood finishes for premium flooring, cabinetry, and architectural millwork.

  4. Plastic coatings for exterior automotive trim and consumer electronics housings.

  5. Aerospace interior coatings where low VOC emissions and non-yellowing properties are critical.

Specifications Of Covestro Desmodur BL 3175 SN Curing Agent

Chemical TypeAliphatic HDI-based polyisocyanate (trimer)
Product FormLiquid
AppearanceColorless to pale yellow, clear liquid
NCO Content (wt %)~21.5%
Viscosity at 25°C (mPa·s)~800–1,200
Density at 20°C (g/cm³)~1.15–1.18
Flash Point (PMCC, °C)~145
Storage Stability≥12 months at ≤25°C in sealed original container


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