The aluminium sheet and coil surface isn't allowed to have a crack, corrosion and crack edge, the sheets that's more than 0.6 mm thick surface diffusion is not approved in spots.
The floor of the anodised aluminum sheet permits moderate scratches, scratches, scratches, curler marks, pine dents and emulsion marks on metallic surfaces and nonmetallic implants. But, the intensity of numerous defects shall now not exceed the allowable poor deviation of the thickness of the sheet, and to make certain the minimal thickness.
In keeping with rectangular meter aluminum alloy sheet surface, the entire region of bubbles need to no longer exceed 100mm2.
System clad aluminum sheet, without or with uncovered elements of the coating and floor bubbles.
Aluminium sheet/ plate defects allow using four hundred sandpaper for inspection of the grinding, the grinding depth shall no longer exceed the thickness tolerance; plate part need to be trimmed, no glitches.