Characterization: Blocked aliphatic polyisocyanate based on IPDI. In combination with polyol components for the formulation of lightfast one-component polyurethane stoving coatings. Properties / Applications: Desmodur® PL 340 can be combined with suitable, preferably flexible, Desmophen® grades to formulate one-component polyurethane stoving coatings which are lightfast and resistant to weathering and chemicals and highly resistant to thermal yellowing. These coatings are used for original automotive topcoats. Compared with polyisocyanates blocked with butanone oxime, Desmodur® PL 340 allows a reduction in stoving temperature of approx. 10 °C, with no decrease in solvent and chemical resistance. Information provided by Covestro |