1)Under natural climate ,film coating will be no flake .no rubbles ,no vestige and no pulverization. 2)Under common environment.no flake.no rubbles. 3)Under common temperatures and radiation,no color deferent. 4)According to international test standard,all the tested items are satisfied with high-class. 5)Our products with PVDF coating which produced under GB/T17748-1999 is with 70% PVDF.and under common environment,we can guarantee 15~20 years;and for FR products,it is good at fireproof,and the FR grade is B1(according to the standard Q B8624).