• Coatings

Desmodur® N 3800

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

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Product Types

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


Elastic, High functional, Solventborne, Weather resistant, Flexible

General Characterization

Desmodur N 3800 is an aliphatic polyisocyanate (flexibilizing HDI trimer).
It is suitable for use as the hardener component for lightfast polyurethane coating systems.

Storage Conditions

Desmodur N 3800 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. Due to the raw materials used, the product can occasionally exhibit temperature-dependent turbidity. This turbidity can be reversed by thinning with solvents or heating carefully to maximum 50°C without adversely affecting the quality of the product. Recommended storage temperature is 0º-30ºC.


No data available

Packaging Type

No data available

Technical Properties & Datasheets


Property Name Test Method Unit Value
Hazen color value ≤ 80
Viscosity at 23°C mPa∙s 6,000 ± 1,200
Monomeric HDI % ≤ 0.25
NCO content % 11.0 ± 0.5


Property Name Test Method Unit Value
Weight per gallon at 20°C lb. 9.33
Equivalent weight approx. 382
Viscosity at 25^oC mPa∙s approx. 5,500
Density at 20°C g/cm^3 1.12
Flash point °C approx. 235


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

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