Desmodur® W/1

Monomeric cycloaliphatic diisocyanate.In the manufacture of polyisocyanates and polyurethanes.

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General Characterization

Monomeric cycloaliphatic diisocyanate.
In the manufacture of polyisocyanates and polyurethanes.

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 temperatures of approx. 25 °C and below can result in crystallization and appropriate settling at the bottom. This solidification is reversible by briefly heating the product without adversely affecting the quality of the product. Our recommendation in that case is warming the product to 40 - 50°C and homogenization before use.


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Packaging Type

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Technical Properties & Datasheets

Property Name Test Method Unit Value
NCO content (calculated from GC) internal method % ≥ 31.8
Acidity internal method mg/kg ≤ 10
Color value (Hazen) DIN EN 1557 ≤ 30
Assay (GC) internal method % ≥ 99.5
Hydrolyzable chlorides internal method mg/kg ≤ 10

Property Name Test Method Unit Value
Density at 20 °C DIN EN ISO 2811 g/ml approx. 1.07
Flash point DIN EN 22 719 °C approx. 200
Start of crystallization °C approx. 25
Vapor pressure at 25 °C hPa approx. 2.1 · 10^-5
Total chlorides mg/kg ≤ 10
Viscosity at 25 °C DIN EN ISO 3219/A.3 mPa*s approx. 30


Technical Data Sheet
Safety Data Sheet
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