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Polished Aluminum is a type of aluminum which has undergone a process called anodization, which changes the appearance of aluminum and makes it non-magnetic or made from a different conductivity. This is done to prevent corrosion by forming a layer of oxide on the surface. The most common form for polished aluminium is 5086 aluminium sheet that has been anodized in blue and 9064 that has been anodized in black. And normally 6061 alloy contains about 1% copper whereas 9064 alloy contains only .07% copper. The price of polis... more