The >27 inches of mercury is preferred and the closer you can get to 100degC the better. Remember that in a vacuum you should get minimal if any oxidation. We used to do this overnight but work I've read indicates that 2 hours is minimal. Rich Kraszewski Advanced Manufacturing Engineer - KEG Phone: 812.634.4281 Pager: 812.481.3492 -----Original Message----- From: Macko, Joe @ IEC [mailto:[log in to unmask]] Sent: Monday, October 27, 2003 3:37 PM To: [log in to unmask] Subject: [TN] vacuum baking populated circuit cards Hello Fellow Technets, I have been asked to research baking out populated FR-4 type circuit boards at lower temperatures using a vacuum oven. I do not have any info on baking boards under a vacuum and what the considerations need to be, or how much vacuum is required. Any help will be appreciated. thanks joe --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e 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 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 847-509-9700 ext.5315 -----------------------------------------------------