If a microetch is used to clean panels prior to oxide, the second pass removes more rather than less copper. I would be very careful about multiple passes through the oxide if microetch is present. Dave Rooke Viasystems Canada -----Original Message----- From: Scott B. Westheimer <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Wednesday, December 16, 1998 10:21 PM Subject: [TN] Oxide rework >Fellow Colleagues, > >Wondering if someone can tell me the industries stand on reworking inner >layers at black oxide. Would like to get the point of view from both the >PCB manufacturer and end user. I realize that controls need to be in >place so that the layers are not over etched and signal lines are not >reduced, especially for controlled impedance layers. The first time the >boards were oxided they had 40u' of copper etched away and I believe >that by reworking and removing 20-30u' this should not effect the >functionality of the boards. > >You comments would be greatly appreciated. > >Scott Westhimer > >################################################################ >TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c >################################################################ >To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: >To subscribe: SUBSCRIBE TechNet <your full name> >To unsubscribe: SIGNOFF TechNet >################################################################ >Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. >For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 >################################################################ > > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################