Oh No, it's De ja-dewey in the middle of the week ;-) Thanks, Mike! -----Original Message----- From: Barmuta, Mike [mailto:[log in to unmask]] Sent: Wednesday, June 21, 2006 9:26 AM To: TechNet E-Mail Forum; Bloomquist, Ken Subject: RE: [TN] Conformal Coat Voids Hi Ken: Maybe it is outgassing of organics from the tin.... Sorry Ken I couldn't help myself. Regards Mike B. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Bloomquist, Ken Sent: Wednesday, June 21, 2006 9:16 AM To: [log in to unmask] Subject: [TN] Conformal Coat Voids We are seeing something that we've never noticed before and wondering if any of you have seen it and figured out a cure. We are hand spray Type UR coating. The boards are very well cleaned and dried prior to coating. What we are seeing is a lack of coating on top of via's. It's most prevalent on small via's, .013" but we're seeing it on some of the larger ones as well. When we black light the board you can see black spots on top of the solder in the via. It's not just a thin coating but an actual void area. It's exactly on the dome of the solder of the via. Our nominal coating thickness is around .003". I sure would appreciate any help on finding a cure for this! Thanks, KennyB --------------------------------------------------- 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 -----------------------------------------------------