In article , Martin H. Eastburn
says...

Jim -

Can you tell me the number of that perfect Al ?

2xxx contains copper
2xxx contains copper and Mg
6xxx contains mg and Si
7xxx contains Zn and Mg
7xxx contains Zn, Mg, Cu
5xxx contains Mg
3xxx contains Mn
4XXX contains Si
1xxx is ?pure more or less ?

Most mirrors are made with *pure* aluminum, there is no
alloying agent used. The stuff on my shelf is 5/9s IIRC.

Jim


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