Hi all I was wonder if anyone had come across a situation where the adhesive under the surface mount components had flux residue trapped which was than attacking the soldermask and copper underneath. Also saw some very small solderballs. Any idea what would be the cause and how to avoid this ? Thanking you -----Original Message----- From: Steve Gregory [mailto:[log in to unmask]] Sent: Friday, October 15, 2004 10:32 AM To: [log in to unmask] Subject: [TN] Solderball Trapped in Flux Residues Hi All! Yesterday, Bill Kenyon sent me a very good picture of a solderball trapped in flux residue that I finally got posted this morning on my web page at: http:www.stevezeva.homestead.com -Steve Gregory- Steve- would you please post this photo on your web site? It's an excellent microphoto of a solder ball on solder mask, showing the flux residue holding it in place. Just washing with water won't do the job, unless it completely dissolves the flux residue. Ref.: An Evaluation of Solder Balls on Printed Wiring Boards with Dry Film Solder Resist, Mira Khutoretsky, Control Data Corp. Electronic Packaging & Corrosion in Microelectronics, pp 225-233, 1987(published by ASM) Bill Kenyon Global Centre Consulting 3336 Birmingham Drive Fort Collins, CO 80526 Tel: 970.207.9586 New Cell: 970.980.6373 --------------------------------------------------- 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 -----------------------------------------------------