type aliphatic polyisocyanate (hexamethylene diisocyanate trimer) form of supply about90%butyl acetate/100solvent naphtha oil (1:1) solution purpose used as light-resistant polyurethane coating curing agent combination   product specifications features value measurement unit method ncocontent 19.6±0.3 % din en iso 11909   method viscosity@25℃ about500 mpa.s din en iso 3219/a.3 equivalent about214     flashpoint about50℃  ...