Desmodur® ultra N 3790 BA

Aliphatic polyisocyanate (high functional HDI trimer). As the hardener component for lightfast, rapid-drying polyurethane coating systems.

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General Characterization

Desmodur ultra N 3790 BA is an aliphatic polyisocyanate (high functional HDI trimer).
It is suitable for use as the hardener component for lightfast, rapid-drying polyurethane coating systems.

Storage Conditions

Desmodur ultra N 3790 BA 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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Packaging Type

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Technical Properties & Datasheets


Property Name Test Method Unit Value
Specific gravity at 20°C g/ml approx. 1.13
Equivalent weight approx. 236
Flash point °C approx. 42
Weight per gallon at 20°C 9.41
Viscosity at 25°C mPa∙s approx. 1,600


Property Name Test Method Unit Value
Viscosity at 23°C mPa∙s 1,800 ± 500
Monomeric HDI % < 0.1
NCO content % 17.8 ± 0.5
Non-volatile content (2.2 g / 120 min / 100^oC) % 90 ± 1
Hazen color value ≤ 40


Technical Data Sheet
Safety Data Sheet
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