Everyone this is fantastic. I can't wait to get some pictures of the microsections. I don't have the solder profile here it is at work. I will post the profile on Monday. It was a leaded process. I am pretty sure that the profile never went over 230 C the failures starting occuring under normal operation at room temperature. In fact I think we have even had one or two failures before we even turned the boards on. i.e. infant mortality. ----- Original Message ----- From: "Werner Engelmaier" <[log in to unmask]> To: <[log in to unmask]> Sent: Saturday, February 24, 2007 2:57 PM Subject: Re: [TN] #2 need help with cracking vias > Hi John, > You did not say if the soldering is lead--free soldering. > I developed recommendations for the specifications of PCBs for lead-free > assembly you may be interested in. > > Regards, > Werner Engelmaier > Engelmaier Associates, L.C. > Electronic Packaging, Interconnection and Reliability Consulting > 7 Jasmine Run > Ormond Beach, FL 32174 USA > Phone: 386-437-8747, Cell: 386-316-5904 > E-mail: [log in to unmask], Website: www.engelmaier.com > > > > ************************************** > AOL now offers free email to everyone. > Find out more about what's free from AOL at http://www.aol.com. > > --------------------------------------------------- > 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 -----------------------------------------------------