Desmodur® U N 3790 BA

Aliphatic polyisocyanate (high functional HDI trimer).

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Product Types

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General Characterization

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


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Packaging Type

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Technical Properties & Datasheets


Property Name Test Method Unit Value
Viscosity at 23 °C DIN EN ISO 3219/A.3 mPa*s 1,800 ± 500
Color value (Hazen) DIN EN 1557 ≤ 40
NCO content DIN EN ISO 11 909 % 17.8 ± 0.5
Non-volatile content (2.2 g / 120 min / 100 °C) DIN EN ISO 3251 % 90 ± 1
Monomeric HDI DIN EN ISO 10 283 % < 0.1


Property Name Test Method Unit Value
Viscosity at 25 °C DIN EN ISO 3219/A.3 mPa*s approx. 1,600
Equivalent weight approx. 236
Density at 20 °C DIN EN ISO 2811 g/ml approx. 1.13
Flash point DIN 53 213/1 °C approx. 42


Technical Data Sheet
Safety Data Sheet
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