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

Covestro Desmodur N3790 BA Curing Agent

Covestro Desmodur N3790 BA is a high-performance aliphatic polyisocyanate curing agent from the Desmodur N series, designed for two-component polyurethane coatings requiring excellent UV stability, gloss retention, and weather resistance in demanding industrial and automotive applications.
  • covestro desmodur n3790 ba curing agent_a9bc7605
  • covestro desmodur n3790 ba curing agent_a9bc7605

Features Of Covestro Desmodur N3790 BA Curing Agent

  1. Bifunctional aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry.

  2. Low-viscosity liquid with excellent storage stability and reduced tendency for gelation.

  3. Offers outstanding UV resistance and long-term color stability in coated systems.

  4. Compatible with a broad range of hydroxyl-functional resins including polyesters, acrylics, and polyethers.

  5. Enables fast ambient- or forced-dry curing with balanced pot life and film formation.

Typical Applications Of Covestro Desmodur N3790 BA Curing Agent

  1. High-performance automotive clearcoats and basecoats requiring gloss retention and weatherability.

  2. Industrial maintenance coatings for metal and plastic substrates exposed to outdoor conditions.

  3. Architectural coatings for façade systems and aluminum composite panels (ACPs).

  4. Precision coatings for optical lenses and electronic enclosures demanding low yellowing.

  5. Wood finishing systems where clarity, hardness, and chemical resistance are critical.

Specifications Of Covestro Desmodur N3790 BA Curing Agent

Chemical TypeAliphatic HDI-based polyisocyanate (trimer)
Product FormClear, colorless to pale yellow liquid
AppearanceHomogeneous, transparent liquid at 20 °C
NCO Content (wt %)15.5 – 16.5
Viscosity at 25 °C (mPa·s)1,800 – 2,400
Density at 20 °C (g/cm³)1.18 – 1.22
Flash Point (PMCC, °C)145 – 155
Storage Stability (unopened, 25 °C)≥ 12 months


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