• Adhesives
  • Coatings, paints & inks

Bayhydur® 401-70 MPA/X

Hydrophilically modified aliphatic IPDI-polyisocyanate. As a co-reactant for aqueous resins and as a hardener for chemically resistant and weather-stable coating systems.

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Product Types

  • PIC
  • Crosslinkers
  • Hardeners
  • Aliphatic polyisocyanate
  • Hydrophilic polyisocyanate
  • Isocyanate
  • Polyisocyanurate
  • Reactive system
  • Polyisocyanate


Coatings, paints & inks
Easy mixing, Hard, Weather resistant, Waterborne
Foam bonding, Heat activated, Moisture resistant, Waterborne

General Characterization

Hydrophilically modified aliphatic polyisocyanate based on isophorone diisocyanate (IPDI).
As the co-reactant for aqueous resins and as the hardener for chemically resistant and weather-stable 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: 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.


No data available

Packaging Type

No data available

Technical Properties & Datasheets


Property Name Test Method Unit Value
Equivalent weight approx. 440
Flash point DIN 55 213/1 °C approx. 40
Density at 20 °C DIN 53 217/3 g/cm3 approx. 1.07


Property Name Test Method Unit Value
Monomeric IPDI M106-ISO 10283 % < 0.35
NCO content M105-ISO 11909 % 9.4 ± 0.5
Color value (Hazen) M017-EN 1557 ≤ 60
Non-volatile content (0.2 g / 60 min / 120 °C) M020-ISO 3251 % 70 ± 2
Viscosity at 23 °C M014-ISO 3219/A.3 mPa*s 600 ± 200


Technical Data Sheet
Safety Data Sheet
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