Hi Randy, I would agree with what Joe said, that some of these "voids" appear to be individual glass fibers that have been plated over. A good analysis via SEM/EDS should be able to determine if these are voids or encapsulated glass fibers. Wade McFaddin > -----Original Message----- > From: Randy [SMTP:[log in to unmask]] > Sent: Tuesday, January 07, 2003 11:26 AM > To: [log in to unmask] > Subject: Re: [TN] Small spots on etch line > > Boards are multilayer that have been thru a plasma etchback process. Some > of the pics show buried via innerlayers which were panel plated prior to > lamination. Multiple etch lines indicate electroless copper deposition, > panel flash plating and a final pattern plate. > We have witnessed these circular voids after drill, after plasma > etchback, after flash plating and in as received coupons. We have one pic > that plainly shows a black circle BETWEEN the electroless etch line and > the > etch line showing the demarcation between the flash and pattern plating. > > --------------------------------------------------- > 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/html/forum.htm for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > ext.5315 > ----------------------------------------------------- --------------------------------------------------- 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------