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Does our Copper free aluminum comply with Grade 5000?

The definition of copper free aluminum is that it contains less than 0.4% copper. While some 5000 series alloys contain less than 0.4% copper, others do not. We use alloy 5005 and 5052 in aluminum sheet components, both of which are copper free. We use 6061 and 6262 alloy aluminum for turned components, and alloys 535 and 356 (modified to 0.4% max. copper) for castings.