PU-655 HDI hydrophilic aliphatic polyisocyanate
PU-655 HDI hydrophilic aliphatic polyisocyanate Curing agent component for aqueous two-component polyurethane systems
Model No. PU-655
Type Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI)
Curing agent component for aqueous two-component polyurethane systems
Description of PU-655
PU-655 is a crosslinking agent for aqueous systems, which require good binding stability and chemical resistance.
Due to the balance between moderate hydrophilicity and high functionality, waterborne two-component polyurethane coatings prepared with PU-655 are characterized by fast drying and curing, high final hardness, and excellent chemical resistance.PU-655 is also used as a cross-linking additive for aqueous polyols and most neutral aqueous polymer dispersions (e.g., polyurethanes, polyvinyl acetates, polyacrylates, and synthetic polymers). PU-655 can also be used as a crosslinking additive in most neutral aqueous polymer dispersions such as polyurethanes, polyvinyl acetates, polyacrylates and synthetic rubber dispersions.
NCO content (%)
Viscosity (23℃, mPa.s)
Hazen color value
HDI monomer content (%)
Flash point (℃)
Store in airtight containers
Recommended storage temperature: 0-30 °C.
Protection against moisture, heat and foreign substances
General information: Hydrophilic isocyanates are very sensitive to moisture and react with water to form
carbon dioxide and water-insoluble urea. Therefore, they must be stored in airtight containers. All forms of water (humid air, solvents, wet containers)
must be prevented because the production of carbon dioxide can lead to a dangerous increase in pressure. Storage at high temperatures causes a slight increase in viscosity and color.
The material safety data sheet for this product is available on request.