Guy, I have been involved with the SIR Handbook for quite some time and can't recall any sections on cleaning SMT reflow ovens. Humidity chambers, yes. Reflow ovens, no. Doug Pauls Guy Ramsey <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 12/04/2007 07:57 AM Please respond to [log in to unmask] To [log in to unmask] cc Subject Re: [TN] SILVER IMMERSION BOARDS ISSUE Yes, I think our problem was oven contamination. We started wrapping immersion silver boards in aluminum foil (loosely) during the bake. We have not had any problems with delaminating or solder performance using this bake out process. We have not tried to clean the oven yet, as we rarely see immersion silver. I understand it is rather difficult. I think there are instructions in the IPC SIR Handbook. ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------