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

Covestro Bayhydur 302 Waterborne Curing Agent

Covestro Bayhydur 302 is a waterborne aliphatic polyisocyanate curing agent from the Bayhydur® series, designed for high-performance two-component waterborne coatings. It delivers excellent gloss retention, weather resistance, and fast ambient-cure capability while meeting stringent VOC regulations and enabling low-emission formulations across automotive refinish, industrial wood, and plastic applications.
  • covestro bayhydur 302 waterborne curing agent_d62a64d5
  • covestro bayhydur 302 waterborne curing agent_d62a64d5

Features Of Covestro Bayhydur 302 Waterborne Curing Agent

  1. Waterborne polyisocyanate crosslinker enabling low-VOC, high-performance coatings.

  2. Excellent compatibility with acrylic, polyester, and hybrid waterborne resins.

  3. Good hydrolytic stability and extended pot life under controlled conditions.

  4. Delivers superior hardness, chemical resistance, and gloss retention in cured films.

  5. Designed for ambient- and forced-dry curing systems without requiring catalysts.

Typical Applications Of Covestro Bayhydur 302 Waterborne Curing Agent

  1. Industrial maintenance coatings for metal substrates.

  2. Waterborne automotive refinish clearcoats and basecoats.

  3. Architectural and decorative protective coatings for interior wood and metal.

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

  5. Coil coating primers and topcoats for pre-painted steel and aluminum.

Specifications Of Covestro Bayhydur 302 Waterborne Curing Agent

Chemical TypeAliphatic polyisocyanate (HDI-based)
Product FormAqueous dispersion
AppearanceClear to slightly hazy liquid
pH (25 °C)7.0 – 8.5
Solids Content (wt%)45 – 50
NCO Content (wt%)6.5 – 7.5
Viscosity (25 °C, mPa·s)150 – 400
Storage Stability (unopened, 25 °C)≥ 6 months


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