... 4.stable and timely supply 5.sincere service Fixed, sealing solar cell components, help to enhance strong components and prolong service ... finish,powder coated,anodized,electrophoresis,wooden grain,sandblasting,high oxidation film (24-30um).3.Advantages: 1) corrosion and oxidation resistance is ... 30-50 years. 4.Quality Standard: GB5237-2008 Aluminium extrusion solar panel frame structure