Are you talking only the ICT bottomside bed of nails fixtures? Then look at the wave solder flux. Are you talking about flying probe? Then look at the paste flux. Are you talking false fails from physically smaller solder joints? The lead-free solder joints should not be causing any difference in the probe-ability, unless you are really seeing open solder joints that are being closed by the probing action. However, the no-clean flux residues from your Pb-free wave solder process and reflow process are now probably being "baked on" a little harder than they were with the no-clean fluxes from your 63/37 process, as the process temperatures are higher. Thus you get more false fails because the test pins have a tougher time breaking through the flux coating. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Joel Alexander Sent: Thursday, October 05, 2006 1:15 PM To: [log in to unmask] Subject: [TN] Lead free ICT testing problems We are seeing intermittent false failures on lead free assemblies. We would have these occasionally with leaded solder but it has significantly increased with lead free. We are using SN100C in our wave solder and Superior 420-S no clean flux. Are there any types of probe pins that can produce better yields with lead free solder. Joel Alexander APSCO Quality Assurance Manager --------------------------------------------------- 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 -----------------------------------------------------