Crystal steel door surface treatment of aluminum grain steel doors aluminum surface treatment: electrophoresis champagne, electrophoresis, silver, shine, polish champagne, iron gray, brushed series and other 18 kinds of surface treatment. The thickness of aluminum are 0.5,0.6,0.7 and 0.8 GB thick. GB specifications are 3 m, 4 m, 6 m long. Aluminum can hold 4% 5% glass, aluminum angle code matching, crystal steel doors aluminum substrate is crystal plate, crystal plate, aluminum extrusions, plastics have impermeable characteristics.