Many years back (too many) I was working on silver epoxy connected hybrids for high reliability applications. I seem to recall that silver migration is a definite issue. Does anyone have any rules for mitigating this risk such as design clearances between pads etc? Best regards, John Burke Director of Operations http://www.optichron.com 4221 Technology Drive Fremont, CA 94538 Cell (408) 515 4992 Desk (510) 249 5233 Main (510) 249 5200 --------------------------------------------------- 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 -----------------------------------------------------