hdi elastic type covesro n3800 about:  aliphatic polyisocyanate (flexibilizing hdi trimer).as the hardener component for lightfast polyurethane coating systems. product types: hdi pic aliphatic polyisocyanate crosslinkers polyisocyanate hardeners polyisocyanurate isocyanate material： coatings, paints & inks：high functional, weather resistant, solventborne, flexible, elastic   technical properties & datasheets characteristics： property name test method unit value viscosity at 23 °c m014-iso...