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Message: <blockquote data-quote="maintenanceguy" data-source="post: 483092" data-attributes="member: 24227">The old pressure treated chemical was  chromated copper arsenate (CCA).  It was the copper in the chemical that ate away aluminum.  CCA was done away with almost 20 years ago.  It's a really good treatment for wood and is still able to be used for some specialized applications but you won't find it at your local lumberyard anymore.There are a bunch of new chemicals that replaced CCA.  Some of these contain copper, some don't.  There is probably pressure treated lumber that is aluminum safe but I don't know how to know which chemical was used on your plywood.</blockquote>