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Desmodur® ultra N 3900

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

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General Characterization

Desmodur ultra 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 ultra 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.

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Technical Properties & Datasheets

Characteristics

Property Name Test Method Unit Value
Flash point °C approx. 203
Equivalent weight approx. 179
Density g/cm^3 approx. 1.15

Specifications

Property Name Test Method Unit Value
Monomeric HDI % < 0.10
NCO content % by wt. 23.5 ± 0.5
Viscosity at 23°C mPa∙s 730 ± 100
Hazen color value ≤ 40

Downloads

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

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