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

Covestro Bayhydur 305 Waterborne Curing Agent

Covestro Bayhydur® 305 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—ideal for automotive refinish, industrial wood, and plastic coatings where low VOC and sustainable chemistry are essential.
  • covestro bayhydur 305 waterborne curing agent_8b5396ff
  • covestro bayhydur 305 waterborne curing agent_8b5396ff

Features Of Covestro Bayhydur 305 Waterborne Curing Agent

  1. Waterborne aliphatic polyisocyanate crosslinker with low VOC and zero APEO content.

  2. Excellent hydrolytic stability and storage life in aqueous dispersions.

  3. Enables fast ambient or low-bake curing for high-gloss, durable coatings.

  4. Delivers superior weather resistance, gloss retention, and chemical resistance.

  5. Compatible with a broad range of acrylic, polyester, and hybrid waterborne resins.

Typical Applications Of Covestro Bayhydur 305 Waterborne Curing Agent

  1. Automotive refinish clearcoats and basecoats.

  2. Industrial maintenance coatings for metal and plastic substrates.

  3. High-performance wood coatings requiring low emission and rapid throughput.

  4. Architectural and decorative coatings for interior/exterior applications.

  5. Coil coating systems where low-temperature cure and film integrity are critical.

Specifications Of Covestro Bayhydur 305 Waterborne Curing Agent

Chemical TypeAliphatic polyisocyanate (HDI-based)
Product FormWaterborne dispersion
AppearanceClear to slightly hazy, colorless to pale yellow liquid
NCO Content (wt %)8.5 – 9.5
pH (at 25 °C)7.0 – 8.5
Brookfield Viscosity (mPa·s, 25 °C)100 – 300
Solids Content (wt %)35 – 40
Primary ApplicationsTwo-component waterborne polyurethane coatings


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