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

Covestro HDI Blocked Curing Agent Desmodur BL 3175 SN

Covestro Desmodur BL 3175 SN is a blocked HDI-based curing agent from the Desmodur BL series, offering excellent storage stability and controlled deblocking at elevated temperatures for high-performance coatings and adhesives.
  • covestro hdi blocked curing agent desmodur bl 3175 sn_372c1a4a
  • covestro hdi blocked curing agent desmodur bl 3175 sn_372c1a4a

Features Of Covestro HDI Blocked Curing Agent Desmodur BL 3175 SN

  1. Thermally reversible blocking with caprolactam, enabling low-temperature processing and high-temperature cure activation.

  2. Excellent storage stability at ambient temperature due to fully blocked isocyanate functionality.

  3. Enables one-component (1K) formulations with extended pot life and reduced handling complexity.

  4. Delivers superior film hardness, chemical resistance, and weatherability in final cured coatings.

  5. Compatible with hydroxyl-functional acrylics, polyesters, and alkyds for versatile resin system integration.

Typical Applications Of Covestro HDI Blocked Curing Agent Desmodur BL 3175 SN

  1. Automotive OEM clearcoats and basecoat/clearcoat systems.

  2. Industrial maintenance coatings for metal substrates requiring durability and corrosion resistance.

  3. High-performance coil coatings for pre-painted metal applications.

  4. Architectural and façade coatings demanding UV stability and long-term gloss retention.

  5. Plastic coatings for automotive interior and exterior trim components.

Specifications Of Covestro HDI Blocked Curing Agent Desmodur BL 3175 SN

Chemical TypeHDI-based aliphatic polyisocyanate, caprolactam-blocked
Product FormLiquid
AppearanceClear, pale yellow liquid
Primary Applications1K thermosetting coatings for automotive, industrial, and architectural use
Key FeaturesBlocked NCO functionality, low volatility, thermal deblocking onset ~130 °C
BenefitsImproved workplace safety, simplified formulation, enhanced storage stability
SolubilityCompatible with common organic solvents (e.g., xylene, butyl acetate, PGMEA)
Storage ConditionsStore in tightly closed containers at 15–25 °C; avoid moisture and elevated temperatures


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