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  • Coatings

Desmodur® N 3900

Low-viscosity, aliphatic polyisocyanate resin based on hexamethylene diisocyanate. As the hardener for weather-stable coating systems.

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About

Product Types

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

Material

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

General Characterization

Desmodur N 3900 is a low-viscosity, aliphatic polyisocyanate resin based on hexamethylene diisocyanate (HDI).
It is used as the hardener for weather-stable coating systems.

Storage Conditions

Desmodur N 3900 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. Storage at significant lower temperatures will result in solidification. This solidification is reversible by briefly heating the product without adversely affecting the quality of the product. Recommended storage temperature is 0º-30ºC.

Sampling

No data available

Packaging Type

No data available

Technical Properties & Datasheets

Property Name Test Method Unit Value
NCO content % by wt. 23.5 ± 0.5
Monomeric HDI % < 0.25
Viscosity at 23°C mPa∙s 730 ± 100
Hazen color value ≤ 40

Property Name Test Method Unit Value
Flash point °C approx. 203
Density g/cm3 approx. 1.15
Equivalent weight approx. 179

Downloads

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