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ANSI H35.4-2017
American National Standard Designation System for Unalloyed Aluminum Download
The 2017 edition supersedes the previous reaffirmation of 2013. The latest revision includes a rewrite of footnote 3 and clarification for the prefix P. This standard provides a system for designating unalloyed aluminum not made by a refining process and used primarily for remelting.
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Aluminum Association [aa]