Other applications Covestro 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... 11/1589Covestro Desmodur N3375 BA/SN HDI trimer curing agent for light-resistant polyurethane coatings