| Crelan NW 5 is a blocked cycloaliphatic polyisocyanate. It is suitable as a hardener for polyurethane powder coatings. Properties / Applications: Coatings based on Crelan NW 5 are characterized by their excellent flow properties and high gloss values. Depending on the polyester used, excellent gloss retention and chalking resistance in outdoor weathering can be obtained. As powder coatings based on Crelan NW 5 also provide good corrosion protection properties, they are ideal for use in outdoor applications. Crelan NW 5 is a hardener for hydroxyl-bearing polyesters based on Desmodur W. A NCO : OH ratio of 1.0 is recommended for optimum film properties. Slight undercrosslinking (NCO : OH ratio = 0.9) is possible depending on the co-reactants used and the film properties required. Overcrosslinking produces no advantages. As with any product, use of Crelan NW 5 in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability. Information provided by Covestro |
