We have a desire to test some circuits using aluminum instead of copper.  Has anyone ever heard of Aluminum foil clad PCB materials?  Any fabricators that process this?  I would really like to do this in flex if it exists.  I also have Dk considerations, but I have to start with the Aluminum problem or the substrate is a moot point.

I know there's a lot of laminates attached to aluminum for heatsinking, but I'm looking for .03mm or less

Pete

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