I guess that's the "it depends" factor. It seemed such a general question, I suppose I should have clarified I was giving a general answer. I assumed the question wasn't asking about heat transfer vias, or it wouldn't have asked about thermal relief. But I did miss #2 completely. It's easy to get too used to the way we do things, that's not a common requirement for us. Thanks - a good reminder! Pete --------------------------------------------------- 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 -----------------------------------------------------