The advantage properties of aluminum alloy are light weight, excellent electrical and thermal conductivity, high corrosion resistance and ductility. Aluminum alloy is soft and usually alloyed with copper, zinc, magnesium, silicon, manganese and lithium to increase strength. When aluminum alloy is exposed to air, an anti-oxidant coating will be formed instantly to protect products. Aluminum alloy is one of the lightest metals.When aluminum ingot is passed between rolls under pressure, it becomes thinner and longer in the direction in which it is moving. This simple process is the basis for producing aluminum plate, sheet and foil. Sheet, the most widely used form of industrial aluminum, is used in applications including aerospace (the skins of planes), transportation (auto body sheet), packaging (can bodies and ends) and construction (building facades).