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

Covestro Desmodur E 21 Curing Agent

Covestro Desmodur E 21 is a low-viscosity aliphatic polyisocyanate curing agent from the Desmodur E series, designed for high-performance two-component polyurethane coatings requiring excellent weather resistance, gloss retention, and fast cure at ambient temperatures.
  • covestro desmodur e 21 curing agent_f833ae10
  • covestro desmodur e 21 curing agent_f833ae10

Features Of Covestro Desmodur E 21 Curing Agent

  1. Aliphatic polyisocyanate-based curing agent offering excellent UV stability and minimal yellowing.

  2. Low viscosity enables easy handling, precise metering, and homogeneous mixing with hydroxyl-functional resins.

  3. Provides outstanding chemical resistance and mechanical durability in cured coatings and adhesives.

  4. Compliant with major global regulatory frameworks including REACH and VOC-compliant formulations.

  5. Enables fast ambient or low-bake cure profiles without compromising film hardness or gloss retention.

Typical Applications Of Covestro Desmodur E 21 Curing Agent

  1. High-performance automotive clearcoats and basecoat/clearcoat systems.

  2. Industrial maintenance coatings for machinery, metal furniture, and agricultural equipment.

  3. Premium wood finishes requiring clarity, scratch resistance, and long-term weatherability.

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

  5. Two-component polyurethane adhesives for demanding bonding applications in transportation and composites.

Specifications Of Covestro Desmodur E 21 Curing Agent

Chemical TypeAliphatic polyisocyanate (hexamethylene diisocyanate–based)
Product FormLiquid
AppearanceColorless to pale yellow transparent liquid
NCO Content (wt %)11.8 – 12.2%
Viscosity at 25 °C1,000 – 1,400 mPa·s
Specific Gravity (20 °C)1.17 – 1.19 g/cm³
Solvent ContentApprox. 45% (acetone, ethyl acetate, xylene-free)
Storage Stability≥12 months at 15–25 °C in sealed original container


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