hdi diourea covesro n75   about: aliphatic polyisocyanate (hdi biuret).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, low viscous, solventborne general characterization: aliphatic polyisocyanate (hdi biuret). as the hardener component for lightfast polyurethane coating systems....