Other applications desmodur n3375 ba/sn hdi trimer curing agent for light-resistant polyurethane coatings type aliphatic polyisocyanate (hdi trimer ) form of supply about 75% butyl acetate/solvent naphtha n... 11/15169Covestro Desmodur N3375 BA/SN HDI trimer curing agent for light-resistant polyurethane coatings