model strong> pu-655 type strong> hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (hdi) used as a water-based two-component curing agent component of polyurethane system introduction strong> pu-655 is a crosslinker for aqueous systems; such aqueous systems need to be characterized by good bond stability and chemical resistance. usage strong> because of moderate hydrophilicity the balance between high performance and...