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

Covestro Desmodur N3390 Curing Agent

Covestro Desmodur N3390 is a high-performance aliphatic polyisocyanate curing agent from the Desmodur N series, designed for premium two-component polyurethane coatings. It offers excellent UV stability, gloss retention, and chemical resistance. Widely used in automotive clearcoats, industrial finishes, and high-durability applications requiring low viscosity and fast cure at ambient or elevated temperatures.
  • covestro desmodur n3390 curing agent_9a4bc99c
  • covestro desmodur n3390 curing agent_9a4bc99c

Features Of Covestro Desmodur N3390 Curing Agent

  1. Aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI), offering excellent UV stability and color retention.

  2. Low-viscosity trimer-type curing agent, enabling easy handling and compatibility with a wide range of polyol systems.

  3. Provides outstanding chemical resistance, including resistance to hydrolysis, solvents, and abrasion in cured coatings.

  4. Meets stringent VOC regulations due to its non-blocking, solvent-free formulation and low monomer content.

  5. Enables fast ambient- or forced-dry curing with balanced pot life for industrial coating applications.

Typical Applications Of Covestro Desmodur N3390 Curing Agent

  1. High-performance automotive clearcoats and basecoats requiring long-term gloss and weather resistance.

  2. Industrial maintenance coatings for machinery, rail vehicles, and agricultural equipment.

  3. Premium wood coatings for furniture, flooring, and architectural millwork.

  4. Plastic coatings for electronics housings, sporting goods, and consumer appliances.

  5. Two-component (2K) polyurethane topcoats in coil and sheet metal finishing lines.

Specifications Of Covestro Desmodur N3390 Curing Agent

Chemical TypeHDI-based aliphatic polyisocyanate trimer
Product FormLiquid
AppearanceClear, pale yellow liquid
NCO Content (wt %)15.5 – 16.5
Viscosity at 25 °C (mPa·s)1,800 – 2,400
Density at 20 °C (g/cm³)1.17 – 1.20
Monomeric HDI Content (max)≤ 0.5%
Storage Stability (unopened, 20 °C)≥ 12 months


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