Your Desmear process in any multilayer shop is doing exactly this, (although it may also remove some amount of Cu, ). Chemistry may depend upon laminate epoxy system. Permanganate is one I am aware of. Jim Herard KBL, Product Quality Engineering IBM Microelectronics Endicott t/l 857-7026 [log in to unmask] 07-16-97 05:57 AM Please respond to [log in to unmask] @ internet To: [log in to unmask] @ internet cc: Subject: Remove prepreg Hello everybody I need some advise Does somebody know how to remove resin (prepreg) from copper surface by chemical means ?? Thanks in advance for any help Tomer *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************