Bayhydur® 2655

Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI).

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General Characterization

Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI).
Hardener for waterborne two-component polyurethane systems.

Storage Conditions

- Storage in original sealed Covestro container.

- Recommended storage temperature: 0 - 30 °C.

- Protect from moisture, heat and foreign material.

General information: Hydrophilic isocyanates are very moisture-sensitive and react with water to form carbon dioxide and insoluble ureas. The containers must always be kept tightly closed. The access of water in all forms (moist air, solvents, moist containers) must be prevented, because the generation of carbon dioxide can lead to dangerous increases in pressure. Storage at higher temperatures will result in increase of color and viscosity.


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Technical Properties & Datasheets


Property Name Test Method Unit Value
Viscosity at 23 °C M014-ISO 3219/A.3 mPa*s 3,500 ± 1,000
Hazen color value M017-EN 1557 < 60
Monomeric HDI M106-ISO 10283 % ≤ 0.24
NCO content M105-ISO 11909 % 20.3 - 21.3


Property Name Test Method Unit Value
Flash point DIN EN ISO 2719 °C approx. 192
Density at 20 °C DIN EN 2811 g/cm3 approx. 1.16


Technical Data Sheet
Safety Data Sheet
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