Hi Steve! How thick is the pwb? Was the profile right? We typically see the solder flow stop short of covering the pwb pad when using immersion silver but not to the extent that your pictures showed. Did you get enough flux applied to the pwb? The 2331 flux is pretty active and I would have thought it would move out any oxidation that would be present from the two reflow passes. Dave Stephen Gregory <Stephen.Gregory@ LABARGE.COM> To Sent by: TechNet [log in to unmask] <[log in to unmask]> cc Subject 03/02/2006 04:15 [TN] As long as we're talking about PM silver... Please respond to TechNet E-Mail Forum <[log in to unmask]> ; Please respond to Stephen Gregory <Stephen.Gregory@ LABARGE.COM> Hi All! I figured as long as we're talking about silver, you might take a look at some PTH solder joints on some boards we just built with an immersion silver finish. I'm posting these pictures because this is the first production board we've built here that has an ImAg finish, and I would like to know if this appearance is pretty typical. Go check out: http://stevezeva.homestead.com/files/Immersion_Silver_PTH.jpg http://stevezeva.homestead.com/files/Immersion_Silver_PTH_2.jpg This particular board went through double-sided reflow, and then the PTH was soldered using a selective wave solder pallet while being fluxed with an ultrasonic spray fluxer using Kester 2331ZX OA flux. You can see that the solder didn't flow out to the edges of the pads on the primary side of the board, the secondary side of the board looks wonderful. I know this is not a defect according to the -610...but is this typical? Especially since it went through two reflow cycles? Thanks in advance! -Steve Gregory- _______________________________________________________ This message may contain information that is privileged and confidential to LaBarge, Inc. It is for use only by the individual or entity named above. If you are not the intended recipient, you may not copy, use or deliver this message to anyone. In such event, you should destroy the message and kindly notify the sender by reply e-mail. --------------------------------------------------- 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 -----------------------------------------------------