Suggest the following: 1. Establish the conditions the PWA will experience in the 'end use environment'. 2. Try to mimic it as closely as possible in a well-accepted SIR regimen. For no clean, try the John Sohn SIR conditions so the residues don't evaporate and confound the results. [Doug Pauls, please add these to the discussion.] 3. Test PWAs prepared and soldered under the same conditions as the SIR boards for residual ionics. 4. When you find SIR results that meet your end use environment, matching ionics level will serve as a reasonable process monitoring level. Bill Kenyon Global Centre Consulting 3336 Birmingham Drive Fort Collins, CO 80526 Tel: 970.207.9586 New Cell: 970.980.6373 --------------------------------------------------- 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 847-615-7100 ext.2815 -----------------------------------------------------