I only see these at the inner layer interface and the first copper plate. Do you see any on the surface or between the flash plate and the pattern or panel plate. If there is nothing on the surface and there is none between the flash plate and pattern or panel plate than it has to be some type of contamination on the inner layer. My best guess. Scott B. Westheimer General Manager, Gultech North Carolina 5800 McHines Place Raleigh, North Carolina 27616 Phone: (919)872-0100 Fax: (919)713-4849 Cell: (919)649-1510 Toll Free: 1-866-gultech [log in to unmask] Web Page: www.gultechna.com ----- Original Message ----- From: "Randy" <[log in to unmask]> To: <[log in to unmask]> Sent: Tuesday, January 07, 2003 12:26 PM 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 -----------------------------------------------------