Thanks. Tin, wherever used, may form whiskers. The list of sources would include tin plating anywhere, lead free solder, and 63-37 solder. But I believe that lead deters whisker formation in eutectic solder generally. That is a statement that is supported by empirical history and much more. I'm copying Carol Handwerker for her opinion on the subject. --- On Mon, 1/23/12, Julie Silk <[log in to unmask]> wrote: From: Julie Silk <[log in to unmask]> Subject: Re: [TN] Finally, the folly of lead-free solder is making the big time To: [log in to unmask] Date: Monday, January 23, 2012, 8:10 AM These weren't soldered with lead-free solder. It was tin-lead. The problem was tin-plated parts or boards (maybe both?). --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 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 For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 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 For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------