Old Aerospace requirements are as follows: * Any component which exceeds 7 grams in weight for every lead of the device * Any D case size components * Any odd geometry which could induce a high moment arm of inertia * Any component which failed Qual( thermal cycling and vibration) due to solder joint fracture or lead to body failure( broken lead, package cracks, resistance increase) There are other reasons to bond, but you requested heavy parts/ epoxy bonding relationships. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Karen Walters Ebner Sent: Monday, July 02, 2007 8:13 AM To: [log in to unmask] Subject: [TN] When to epoxy heavy components Sorry I am posting again but I was not subscribed. I would greatly appreciate it if someone could help refresh my memory to remind me of the golden rule on heavy components when to apply epoxy. Phil Zarrow wrote an article on this some years back. Greatly appreciate. Karen Ebner --------------------------------------------------- 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 -----------------------------------------------------