1) Let it through etcher four times as you do for 1 oz copper and if the finish width is absolute importnat to you, you may compensate a trace/space, while you do image . 2) You need a lot , a lot resin to fill up the space ---------- From: sam mccorkel[SMTP:[log in to unmask]] Sent: Thursday, February 27, 1997 11:42 AM To: [log in to unmask] Subject: FAB: 3 layer board with 4 oz copper I have 2 issues that I'd like to get some advise on. 1) Does anybody have advise on etching 4 oz copper? The traces are .024" and we etch with ammoniacal etchant. 2) Is there any advise on laminating a 3 layer board with 4 oz base copper on all layers? .062" finish thickness and the layup is at our discretion. *************************************************************************** * 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] * ***************************************************************************