Some quick thoughts before I call it a day? Br- Possible something from the FR4fire retardant? Dust from routing? Non-wetting? Well you can plate onto about anything (ie., bronze baby shoes). Perhaps the gold is thin and dissolves quickly exposing an unsolderable (highly oxidized) surface beneath? Rich K / KEJ -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Gilbert Min Sent: Monday, April 14, 2008 9:48 PM To: [log in to unmask] Subject: [TN] Non wetting problem Dear All. Hope you had a nice weekend. I got a call from my customer that my PCB has non wetting problem, and I received 2 defect samples I saw the contaminated gold plated surface @ 1st sample, no abnormal surface and defects were found @ other sample. I understand the contaminated gold surface was able to make non wetting problem, but Another sample, I couldn't find anything on surface. We did FE-SEM / EDX analysis. Results: 1st sample: Br, Au, C, O, Au 2nd sample C, O, Au Ion were detected . I wonder why Br was detected?, do you have any idea for defection of Br on Gold plated surface?. For 2nd sample, I have no idea, I could not understand the mechanism for non wetting problem without any abnormal gold plated surface. If have idea & possible, would you share your great wisdom to me? Best Regards / Gilbert Min Tel.: 82- (0) 11-9242-5340 --------------------------------------------------- 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 -----------------------------------------------------