Characterization: Aliphatic polyisocyanate (low-viscosity HDI trimer). Use as the hardener component for flexible, lightfast polyurethane coating systems. Properties / Applications: Desmodur® N 3600 is used primarily as the hardener component for lightfast two-component polyurethane coatings with high resistance to chemicals and weathering, very good gloss retention and outstanding mechanical properties. Preferred co-reactants are polyacrylate or polyester polyols. The main applications for systems based on Desmodur® N 3600 are air- and force-drying coatings for automotive OEM, automotive refinishing, transportation, industrial finishing and plastics. On account of its low viscosity, Desmodur® N 3600 is particularly suitable for the formulation of high-solids coatings and can also be used as the hardener for aqueous two-component polyurethane coatings. Information provided by Covestro |