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

Covestro Bayhydur BL 5335 Waterborne Blocked Curing Agent

Covestro Bayhydur BL 5335 is a waterborne blocked polyisocyanate curing agent offering excellent storage stability, low-VOC performance, and efficient ambient-cure capability after deblocking. Ideal for high-performance water-based coatings in automotive refinish, industrial wood, and plastic applications requiring durability, gloss retention, and chemical resistance.
  • covestro bayhydur bl 5335 waterborne blocked curing agent_31c71255
  • covestro bayhydur bl 5335 waterborne blocked curing agent_31c71255

Features Of Covestro Bayhydur BL 5335 Waterborne Blocked Curing Agent

  1. Waterborne, VOC-compliant formulation supporting sustainable coating systems.

  2. Blocked isocyanate chemistry enabling ambient-cure storage stability and heat-activated crosslinking.

  3. Excellent compatibility with acrylic, polyester, and polyurethane dispersions.

  4. Delivers high film hardness, chemical resistance, and gloss retention after curing.

  5. Low free monomer content, meeting stringent regulatory requirements for industrial coatings.

Typical Applications Of Covestro Bayhydur BL 5335 Waterborne Blocked Curing Agent

  1. Automotive OEM and refinish clearcoats and basecoats.

  2. Industrial maintenance coatings for metal substrates.

  3. Wood finishing systems requiring low-temperature cure profiles.

  4. Plastic coatings for automotive interior parts and electronics housings.

  5. High-performance coil coatings for architectural and appliance applications.

Specifications Of Covestro Bayhydur BL 5335 Waterborne Blocked Curing Agent

Chemical TypeBlocked aliphatic polyisocyanate (hexamethylene diisocyanate derivative)
Product FormAqueous dispersion
AppearanceClear to slightly hazy, colorless to pale yellow liquid
pH (25 °C)7.0 – 8.5
Solids Content (wt.%)45 – 49
Viscosity (mPa·s, 25 °C, Brookfield RVT, spindle #3, 10 rpm)150 – 350
Density (g/cm³, 20 °C)1.05 – 1.10
Storage Stability (sealed container, 25 °C)≥ 6 months


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