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

Covestro Desmodur BL3175SN Curing Agent

Covestro Desmodur BL3175SN is a low-viscosity aliphatic polyisocyanate curing agent from the Desmodur BL series, designed for high-performance 2K PU coatings requiring excellent weather resistance, gloss retention, and fast ambient-cure capability—ideal for automotive refinish and industrial applications.
  • covestro desmodur bl3175sn curing agent_62cdd878
  • covestro desmodur bl3175sn curing agent_62cdd878

Features Of Covestro Desmodur BL3175SN 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, transparent, or light-colored coating systems requiring long-term aesthetic integrity.

  4. Good reactivity with hydroxyl-functional resins (e.g., polyester, acrylic, and polyether polyols) under ambient or moderate bake conditions.

  5. Complies with major global regulatory frameworks including REACH and meets VOC-compliant formulations when used as directed.

Typical Applications Of Covestro Desmodur BL3175SN Curing Agent

  1. High-performance automotive clearcoats and OEM topcoats.

  2. Premium industrial maintenance coatings for rail, construction equipment, and agricultural machinery.

  3. Architectural and façade coatings requiring weather resistance and gloss stability.

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

Specifications Of Covestro Desmodur BL3175SN Curing Agent

Chemical TypeAliphatic HDI-based polyisocyanate (trimer)
Product FormClear, low-viscosity liquid
AppearanceColorless to pale yellow, transparent
NCO Content (wt %)Approx. 18.5–19.5%
Viscosity at 25°C (mPa·s)Approx. 800–1,200
Density at 20°C (g/cm³)Approx. 1.18–1.22
Flash Point (PMCC, °C)Approx. 145–155
Primary ApplicationsTwo-component polyurethane coatings for high-end decorative and protective uses


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