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What does the first digit of basic four-digit identification system for aluminum alloys designate?

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What does the first digit of basic four-digit identification system for aluminum alloys designate?

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  1. Wrought and cast alloys now use about the same system in the US. The ISO system is based on composition:

    http://en.wikipedia.org/wiki/Aluminium_a...

    1=>99% pure

    2=copper alloy

    3=manganese

    4=silicon

    5=magnesium

    6=magnesium & silicon

    7=zinc

    8=miscellaneous

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