Desmodur® ultra N 3690

Aliphatic polyisocyanate (HDI trimer).

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Product Types

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General Characterization

Aliphatic polyisocyanate (HDI trimer).
As the hardener component for lightfast 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.


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Packaging Type

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Technical Properties & Datasheets


Property Name Test Method Unit Value
Viscosity at 23 °C M014-ISO 3219/A.3 mPa*s 250 ± 150
Non-volatile content 2.2 g / 120 min / 100 °C M020-ISO 3251 % 90 ± 1
Monomer content M106-ISO 10283 % < 0.10
Color value (Hazen) M017-EN 1557 ≤ 40
NCO content M105-ISO 11909 % 20.7 ± 0.5


Property Name Test Method Unit Value
Flash point DIN 53213 °C approx. 58
Equivalent weight approx. 203
Viscosity at 25 °C M014-ISO 3219/A.3 mPa*s approx. 200
Density at 20 °C DIN EN ISO 2811 g/ml approx. 1.13


Technical Data Sheet
Safety Data Sheet
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