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

Covestro Bayhydur 401-70 Waterborne Curing Agent

Covestro Bayhydur 401-70 is a waterborne aliphatic polyisocyanate curing agent from the Bayhydur® series, designed for high-performance two-component waterborne coatings. It delivers excellent gloss retention, chemical resistance, and rapid ambient-cure capability while meeting stringent VOC regulations. Ideal for automotive refinish, industrial wood, and plastic coatings where low-emission, durable finishes are critical.
  • covestro bayhydur 401 70 waterborne curing agent_d7318aac
  • covestro bayhydur 401 70 waterborne curing agent_d7318aac

Features Of Covestro Bayhydur 401-70 Waterborne Curing Agent

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

  2. Excellent hydrolytic stability and storage stability in aqueous systems, enabling extended shelf life.

  3. Fast ambient-cure kinetics when paired with waterborne polyols, supporting efficient production cycles.

  4. Delivers outstanding gloss retention, UV resistance, and weathering performance in final coatings.

  5. Low free monomer content (<0.1% HDI), enhancing occupational safety and regulatory compliance.

Typical Applications Of Covestro Bayhydur 401-70 Waterborne Curing Agent

  1. Architectural and industrial maintenance coatings requiring high durability and low odor.

  2. Automotive refinish coatings where waterborne technology meets OEM performance standards.

  3. Wood coatings for furniture and cabinetry demanding clarity, hardness, and scratch resistance.

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

  5. General-purpose protective coatings for metal substrates in infrastructure and equipment applications.

Specifications Of Covestro Bayhydur 401-70 Waterborne Curing Agent

Chemical TypeAliphatic polyisocyanate (HDI-based) dispersion
Product FormOpaque white to slightly yellow liquid
AppearanceHomogeneous aqueous dispersion
Solids Content (wt %)45–47%
pH (at 23 °C)7.0–8.5
Viscosity (mPa·s, 23 °C)150–350
NCO Content (wt %)6.5–7.2%
Free HDI Monomer (wt %)<0.1%


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