• Coatings

Bayhydur® XP 2451/1

Hydrophilic aliphatic HDI-polyisocyanat. To formulate water-reducible two-component coatings, top coats and sealers. As an additive to enhance the property profile of waterborne coating systems.

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Product Types

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


Weather resistant, Solvent-free, Easy mixing, Waterborne

General Characterization

Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI).
Hardener for waterborne two-component coatings, top coats, sealers and as an additive to enhance the property profile.

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
Hazen color value M017-EN 1557 < 60
Viscosity at 23 °C M014-ISO 3219/A.3 mPa*s 600 - 1,200
Monomeric HDI M106-ISO 10283 % < 0.23
NCO content M105-ISO 11909 % 19.8 - 20.8


Property Name Test Method Unit Value
Density at 20 °C DIN 53 217/3 g/ml approx. 1.15
Flash point DIN EN 22 719 °C approx. 195


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