Technical datasheet

Bayhydur® 304

Supplied byCovestro- Last Updated on Jul 25, 2025

Bayhydur® 304 by Covestro acts as a crosslinking agent in waterborne adhesive systems. It is a solvent-free, hydrophilically modified, aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI).
  • It shows good compatibility with the solvents listed esters, ether esters, xylene and solvent naphtha® 100.
  • Because of its hydrophilic character, it can be easily emulsified in the aqueous phase.
  • The dosage level of 3-10% of Bayhydur® 304 is recommended to crosslink adhesive dispersions containing 40-60% polymer.
  • It has a shelf life of 9 months.
Chemical family:
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Bio Based contentVisible After Login

Benefits

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Compliance

Food Contact Approval
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Certifications & Compliance
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Applications

Recommended markets

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For which system

Adhesives|
Water-based Adhesives

Availability

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Bayhydur® 304 properties

Other properties

PropertiesValue & unitTest conditionTest method
Amine Hydrogen Equivalent Weight (AHEW)0.0 Visible After LoginVisible After LoginVisible After Login
Color, APHA0.0 Visible After LoginVisible After LoginVisible After Login
Density0.0 Visible After LoginVisible After LoginVisible After Login
Flash Point0.0 Visible After LoginVisible After LoginVisible After Login
Monomeric HDI Content0.0 Visible After LoginVisible After LoginVisible After Login
NCO content0.0 Visible After LoginVisible After LoginVisible After Login
Viscosity0.0 Visible After LoginVisible After LoginVisible After Login

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