PVDF is a semi-crystalline fluorocarbon， it is combined by fluorocarbon bond an chemical structure, and this kind of short bond structure could be the most stable and the strongest combination with hydrog gen; meanwhile, it's a thermoplastic processing plastic of higher molecular weight, the coating which is sprayed by fluorocarb bon that is made up of 70% PVDF resin,with the incomparable super weather resistance property and processing technic,cou uld use more than 20 years, soit is the first choice of metal surface treatment for high-rise building or the extremely harsh enviro onment constructional engineering.