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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About
Product Types
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Material
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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.
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 |
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Density | g/cm^3 | approx. 1.15 | |
Flash point | °C | approx. 203 | |
Equivalent weight | approx. 179 |
Specifications
Property Name | Test Method | Unit | Value |
---|---|---|---|
NCO content | % by wt. | 23.5 ± 0.5 | |
Hazen color value | ≤ 40 | ||
Monomeric HDI | % | < 0.10 | |
Viscosity at 23°C | mPa∙s | 730 ± 100 |
Downloads
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Technical Data Sheet
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Safety Data SheetNo direct download available, please visit www.productsafetyfirst.covestro.com