• Coatings

Desmodur® N 3400

Aliphatic polyisocyanate (HDI uretdione). As the hardener component for lightfast polyurethane coating systems.

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Product Types

  • PIC
  • Crosslinkers
  • Hardeners
  • Aliphatic polyisocyanate
  • Isocyanate
  • Polyisocyanurate
  • Polyisocyanate


Easy mixing, Low viscous, Solvent-free, Weather resistant, Waterborne

General Characterization

Desmodur N 3400 is an aliphatic polyisocyanate (HDI uretdione).
It is suitable for use as the hardener component for lightfast polyurethane coating systems.

Storage Conditions

Desmodur N 3400 should be stored in tightly sealed original containers and protected from moisture, heat, and foreign materials. The product is sensitive to moisture. Storage at higher temperatures will result in increase of color and viscosity. Recommended storage temperature is 0º-30ºC.


No data available

Packaging Type

No data available

Technical Properties & Datasheets


Property Name Test Method Unit Value
Viscosity at 25°C mPa∙s 152 ± 65
Hazen color value ≤ 80.0
Monomeric HDI % ≤ 0.30
NCO content % 21.8 ± 0.7


Property Name Test Method Unit Value
Equivalent weight approx. 193
Flash point °C approx. 180
Specific gravity at 25°C g/cm^3 approx. 1.14
Viscosity at 23°C mPa∙s approx. 175
Weight per gallon at 25°C lb. 9.50


Technical Data Sheet
Safety Data Sheet
No direct download available, please visit www.productsafetyfirst.covestro.com

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