Rudy, Thanks for the reply. Currently the maximum thickness we are using is 6.0 oz copper foil supplied to us by one of our suppliers. We are using this for our inner layers. We haven't tried panel plating on building heavy copper. Line width and space of the current production ranges from 0.2mm and up. Right now, we are still capable of etching this. My concerns actually are the related tests needed for heavy copper pcb. Thanks. rey c",? Rudy Sedlak <[log in to unmask] To: [log in to unmask] COM> cc: Sent by: Subject: [TN] Heavy copper foil TechNet <[log in to unmask] org> 10/21/2003 10:11 AM Please respond to "TechNet E-Mail Forum."; Please respond to RSedlak So, the issue becomes one of etching heavy copper, correct? I am assuming you intend to panel plate? How heavy are you going to build this? Some people have pattern plated, using multiple layers of dryfilm, but there is a limit... Tell us what you have to build...how thick, and what line and space, etc. Rudy Sedlak RD Chemical Company --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------