• 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


High functional, Weather resistant, Solventborne, Flexible, Elastic

General Characterization

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

Storage Conditions

- Storage in original sealed Covestro container.

- Recommended storage temperature: 0 - 30 °C.

- Protect from moisture, heat and foreign material.

General information: 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 max. 50 °C without adversely affecting the quality of the product.


No data available

Packaging Type

No data available

Technical Properties & Datasheets


Property Name Test Method Unit Value
Color value (Hazen) M017-EN 1557 ≤ 80
Viscosity at 23 °C M014-ISO 3219/A.3 mPa*s 6,000 ± 1,200
Monomeric HDI M106-ISO 10283 % ≤ 0.25
NCO content M105-ISO 11909 % 11.0 ± 0.5


Property Name Test Method Unit Value
Density at 20 °C DIN EN ISO 2811 g/ml approx. 1.12
Viscosity at 25 °C M014-ISO 3219/A.3 mPa*s approx. 5,500
Equivalent weight approx. 382
Flash point DIN 22 719 °C approx. 235


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