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

Covestro Bayhydur BL 5140 Waterborne Curing Agent

Covestro Bayhydur BL 5140 is a waterborne aliphatic polyisocyanate curing agent from the Bayhydur® series, designed for high-performance two-component waterborne coatings. It offers excellent gloss retention, weather resistance, and low VOC content, enabling durable, eco-friendly finishes in automotive refinish and industrial applications.
  • covestro bayhydur bl 5140 waterborne curing agent_3eccf69f
  • covestro bayhydur bl 5140 waterborne curing agent_3eccf69f

Features Of Covestro Bayhydur BL 5140 Waterborne Curing Agent

  1. Waterborne aliphatic polyisocyanate dispersion with low VOC content, compliant with stringent environmental regulations.

  2. Excellent compatibility with a broad range of waterborne acrylic and polyurethane dispersions.

  3. Enables fast ambient-cure performance while maintaining good pot life stability (typically ≥4 hours at 23 °C).

  4. Delivers outstanding gloss retention, yellowing resistance, and UV stability in final coatings.

  5. Low free monomer content (<0.1 wt%) ensures enhanced occupational safety and regulatory compliance.

Typical Applications Of Covestro Bayhydur BL 5140 Waterborne Curing Agent

  1. Architectural interior wall and ceiling coatings requiring low odor and rapid drying.

  2. Industrial maintenance coatings for metal substrates in mild to moderate exposure conditions.

  3. Wood finishes for furniture and cabinetry where clarity, hardness, and non-yellowing performance are critical.

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

  5. General-purpose high-performance waterborne topcoats for OEM and refinish applications.

Specifications Of Covestro Bayhydur BL 5140 Waterborne Curing Agent

Chemical TypeAliphatic polyisocyanate (HDI-based) dispersion
Product FormOpaque white to slightly yellow liquid
AppearanceHomogeneous aqueous dispersion
Solids Content48–52 wt%
pH Value7.5–8.5
Viscosity (23 °C, Brookfield RVT, spindle #3, 20 rpm)200–600 mPa·s
Free HDI Monomer<0.1 wt%
Primary ApplicationsTwo-component waterborne polyurethane coating systems


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