Inge, By your statement (maybe their statement) "... few solder joint reliability problems when mixing SnPb and LF components and solder alloys." Doesn't that imply that that they are mixing lead into the solder joint in one way or another, "mixing SnPb and LF". I would think that any amount of lead added would help. KennyB -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Sent: Tuesday, May 04, 2010 1:36 PM To: [log in to unmask] Subject: Re: [TN] Why not Pb-free? You reminded me of a report from NPL-2005. In cooperation with Aeroflex, Alcatel, BAE, Bosch, Goodrich, RR, TRW and some more. A very advanced investigation with lots of solders with Pb and without Pb. The titel was: Measuring the Reliability of Electronics Assemblies during the Transation Period to Lead free Soldering. The foreword had this content: "The work has indicated that there should be few solder joint reliability problems when mixing SnPb and LF components and solder alloys. Very few thermal cycling fatigue failures were experienced. Not one single failure was generated during the harsh vibration testing ". I can't scan all these pages, however, if someone, not to many, are interested, I can send it offline. You can probably get it from NPL directly yourself. Very optimistic result at that time. Just wonder how they feel today. Anyone from NPL? Inge ______________________________________________________________________ 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 -----------------------------------------------------