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 --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 16.0. To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ---------------------------------------------------------------------------------