DESMODUR N3680 is an Aliphatic Polyisocyanates based on HDI (Hexamethylene Di isocyanate) in combination with Desmophen Polyesters or Polyaspartics as well as other Polyols for solvent-based or solvent-free 2K PU Coatings for Wood, Plastic, Metal & Mineral surfaces. Low viscous grades also for waterborne 2K PU formulations. Additionally, it contains the advantages of outstanding outdoor resistance, very high mechanical resistance, and high chemical resistance.