hi, if by a visible interface you are talking about different microstructures between the innerlayer foil and the plating in the hole, you are okay. if you are talking about a black interface between the inner layer foil and the plating in the hole, you've got a problem. phil -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Finks, Tim (Healdsburg) Sent: Monday, January 10, 2005 2:15 PM To: [log in to unmask] Subject: [TN] Inner layer to barrel connection quality I have PTH cross-section images which show a visible interface between inner layer foils and the PTH plating. Earlier, similar, board cross-sections show no discernable interface - the inner layer foil and the barrel plating appear to be integral. What should I see when I have an acceptable PWB? Regards, Tim Finks --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 -----------------------------------------------------