hdi trimer covesro n3390 about:   characterization aliphatic polyisocyanate (hdi trimer). as the hardener component for lightfast polyurethane coating systems form supplied approx. 90 % in n-butyl acetate   specification: property value unit of measurement method nco content 19.6 ± 0.3 % m105-iso 11909 non-volatile content (2.2 g / 120 min / 100 °c) 90 ±...