All the formulations that I tested electromigrate at 85/85 -50V on IPC B 24 coupons (0.5mm spacing) and at 65/85 10V on IPC B 25 B combs (12.5 mil spaces), so that's too close. Karen Tellefsen - Electrical Testing [log in to unmask] 908-791-3069 John Burke <jburke@OPTICHRON .COM> To Sent by: TechNet [log in to unmask] <[log in to unmask]> cc Subject 07/15/2009 01:11 [TN] Silver epoxy PM Please respond to TechNet E-Mail Forum <[log in to unmask]> ; Please respond to John Burke <jburke@OPTICHRON .COM> 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------