We saw this in early testing of Pb-Free solder. Solder would climb the leg up to the package. But, then drop back down as the surface tension and wetting forces equalized. This looks like something inhibited that phase of the reaction. I wonder if Wayne isn't on to something. The solder looks doped. Guy -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Jerry Dengler Sent: Monday, June 28, 2010 7:40 AM To: [log in to unmask] Subject: Re: [TN] QFP short at top of the leads Jowan, Was this part dipped in solder before placing? It looks like solder has coated the whole lead right up to the body. Jerry -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Iven, Jowan Sent: Monday, June 28, 2010 5:08 AM To: [log in to unmask] Subject: [TN] QFP short at top of the leads Has anyone ever seen a QFP where shorts occur after soldering at the top of the leads? And the leads look pretty dull after soldering. Any ideas? A picture is available at http://ipc-technet.groupsite.com/uploads/galleries/x/000/020/5ba/technet 01.jpg Jowan Iven ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- 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 -----------------------------------------------------