Jim. Aside from the spec, pictures 1 & 3 don't bother me much as there is still a dam. Picture 2 on the other hand looks like it could easily be broken off removing any barrier at all. Assuming this to be photo imaginable? I suspect we spent a little bit to much time in the developer. Possible underexposed but probably to much develop. Chuck Brummer 3M Manufacturing Engineer 8357 Canoga Ave. Canoga Park, CA 91304-2605 (818) 734-4930 From: J W <[log in to unmask]> To: [log in to unmask] Date: 09/03/2009 12:55 PM Subject: [TN] Acceptability of Printed Boards (Solder Mask) Sent by: TechNet <[log in to unmask]> Hello All, Can someone point me to the section (s) in either IPC-6012 or IPC-A-600 or other standards that explains the acceptance criteria for Solder Mask UNDER-CUTTING? Please go to Steve's web-site following the links below to see a few pictures of a Solder Mask defect that was discovered by our customer (they only stated "reject due to severe undercutting"). With this situation, we are trying to help our China source fix this issue, and we need to help them understand what section (s) of the standard (s) they should be looking at so they can establish a corrective action. http://stevezeva.homestead.com/files/Solder_Mask_Undercutting.jpg http://stevezeva.homestead.com/files/Solder_Mask_Undercutting_2.jpg http://stevezeva.homestead.com/files/Solder_Mask_Undercutting_3.jpg Thanks, Jim --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 15.0 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 -----------------------------------------------------