application pu-655 hdi hydrophilic aliphatic polyisocyanate is used as curing agent component of waterborne two-component polyurethane system model strong> pu-655 type strong> hydrophilic aliphatic polyisocyanate based on hexamethylene ... 11/20252PU-655 HDI hydrophilic aliphatic polyisocyanate is used as curing agent component of waterborne two-component polyurethane system