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Bayhydur® ultra 304

Hydrophilically modified, aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI). As the hardener/binder component for high-quality waterborne polymer dispersions and as an additive to improve the property level of waterborne coating and adhesive systems

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General Characterization

Bayhydur ultra 304 is a hydrophilically modified, aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI).
It is suitable for use as the hardener/binder component for high-quality waterborne polymer dispersions and as an additive to improve the property level of waterborne coating and adhesive systems.

Storage Conditions

Bayhydur ultra 304 should be stored in tightly sealed original containers and protected from moisture, heat, and foreign materials. 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. Recommended storage temperature is 0º-30ºC.

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Technical Properties & Datasheets

Characteristics

Property Name Test Method Unit Value
Equivalent weight approx. 230
Flash point °C 226
Density g/ml approx. 1.16

Specifications

Property Name Test Method Unit Value
Monomeric HDI % < 0.10
NCO content % 17.7 - 18.7
Color value (Hazen) ≤ 60
Viscosity at 23^oC mPa∙s 2,500 - 5,500

Downloads

Technical Data Sheet
Safety Data Sheet
No direct download available, please visit www.productsafetyfirst.covestro.com

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