Here's a question for all you electrical fans...( ha, ha, ha, not those type of shorts) We are getting high resistance shorting on multilayer polyimide only boards. Inner layers test out with no problem. Immediately after outer layer etch there are the shorts. Omega meter testing shows no ionic contamination at this stage. Baking prior to ET reduces the number of shorts, although after a few days the shorts are back. Construction of board is foil copper at lamination, not cap-core. As usual, any and all help is greatly appreciated. Russ _________________________________________________________________ Free up your inbox with MSN Hotmail Extra Storage. Multiple plans available. http://click.atdmt.com/AVE/go/onm00200362ave/direct/01/ --------------------------------------------------- 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 -----------------------------------------------------