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

Covestro Desmodur N3390 BA/SN Curing Agent

Covestro Desmodur N3390 BA/SN 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 chemical resistance—ideal for automotive clearcoats and premium industrial finishes.
  • covestro desmodur n3390 ba sn curing agent_aacfbf64
  • covestro desmodur n3390 ba sn curing agent_aacfbf64

Features Of Covestro Desmodur N3390 BA/SN Curing Agent

  1. Aliphatic HDI-based polyisocyanate with low volatility and excellent UV stability.

  2. Pre-polymers containing biuret (BA) and siloxane-modified (SN) functionality for enhanced hydrolytic resistance.

  3. Low viscosity liquid enabling easy handling, precise metering, and compatibility with standard spray equipment.

  4. Non-yellowing performance ideal for high-gloss, weather-resistant topcoats in demanding outdoor applications.

  5. Reactive NCO content optimized for balanced pot life and rapid ambient or forced-dry cure kinetics.

Typical Applications Of Covestro Desmodur N3390 BA/SN Curing Agent

  1. Automotive clearcoats and OEM refinish systems requiring long-term gloss retention.

  2. High-performance industrial maintenance coatings for bridges, wind turbine blades, and offshore structures.

  3. Premium architectural coatings for façades, aluminum composite panels (ACM), and curtain wall systems.

  4. Plastic coatings for automotive interior trim and exterior decorative components.

Specifications Of Covestro Desmodur N3390 BA/SN Curing Agent

Chemical TypeAliphatic polyisocyanate (HDI-based biuret/siloxane hybrid)
Product FormLiquid
AppearanceClear, colorless to 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 – 1.19
Primary ApplicationsTwo-component polyurethane topcoats and clearcoats
Key FeaturesUV resistance, hydrolytic stability, low VOC potential, non-yellowing


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