Ken: Matt tin is a mitigating factor according to some reports. Most companies are aware of Tin whiskers. They also anneal the parts for an hour at 150 deg C for an hour within an hour after they are plated to release the stress caused by plating. In addition if the boards are Cced, then the combination of the three reduces the case for whiskers. For defense of space use. this is not enough. In those cases the need for replating by dipping all the way to the base of the lead is necessary. The military would accept one or two parts as described at the beginning, potentially problematic real state is small, with their prior approval. Regards, Ramon -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Charles Dennehy Sent: Thursday, January 25, 2007 8:14 AM To: [log in to unmask] Subject: Re: [TN] Lead-Finish Question Ken, Below is a link to a nearly finished Office of Naval Research, ManTech Research Project on Tin Whisker Mitigation if that helps. Charley Dennehy http://www.bmpcoe.org/news/bmpnews/tinwhisker_report.pdf -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Bloomquist, Ken Sent: Wednesday, January 24, 2007 1:25 PM To: [log in to unmask] Subject: [TN] Lead-Finish Question Here's a question for all the high rel people out there. We've received a couple of notifications from major component suppliers that they will no longer supply the parts we need with a SnPb finish. Instead they are only supplying them with "Matt (Matte) Tin" finish. They do not talk about any under plating which would be desirable for minimizing tin whiskers. How are you people who build for DOD and medical handling these situations? Am I being too sensitive about Matt Tim? By the way these are single source and SMT parts. Thanks in advance, KennyB --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------