Bayhydur® 3100

Hydrophilic aliphatic HDI-polyisocyanat for waterborne 2-component polyurethane systems. Corresponds to the following sections of the U.S. FDA`s guidlines Title 21 CFR: Section 175.105 "Adhesives".

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Product Types

  • Hydrophilic polyisocyanate


No data available

General Characterization

Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI).
As the hardener component for high-quality aqueous two-component polyurethane systems and as an additive to improve the property profile of aqueous coating and adhesive systems.
With respect to its composition, the product corresponds to the following sections of the U.S. FDA's guidlines "Title 21 CFR" : Section 175.105 "Adhesives".

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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Packaging Type

No data available

Technical Properties & Datasheets


Property Name Test Method Unit Value
Equivalent weight approx. 241
Viscosity at 25 °C DIN EN ISO 3219/A.3 mPa*s approx. 2,500
Density at 20 °C DIN EN ISO 2811 g/ml approx. 1.16
Flash point DIN EN 22 719 °C > 250


Property Name Test Method Unit Value
Monomeric HDI DIN EN ISO 10 283 % ≤ 0,15
Color value (Hazen) DIN EN 1557 ≤ 60
NCO content DIN EN ISO 11 909 % 17.4 ± 0.5
Viscosity at 23 °C DIN EN ISO 3219/A.3 mPa*s 2,800 ± 800


Technical Data Sheet
Safety Data Sheet
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