I do not know the humidity level but from what I can tell from the return water is condensing to the extent that drops are rolling off the backplane in some locations Joel Alexander Quality Assurance Manager TT APSCO, INC. "Whittaker, Dewey (EHCOE)" <[log in to unmask]> 12/03/2007 09:46 AM To "TechNet E-Mail Forum" <[log in to unmask]>, <[log in to unmask]> cc Subject RE: [TN] Wave solder flux volume measurements Your Environmental condition was damp/moist. Is that opposed to damp/dry or dry/moist? It would more helpful to relate it to temperature and relative humidity with the additional qualifier of standing water or not. A general rule of thumb (besides move it before striking with heavy objects) is that no-cleans should not be used in that application. A cleanable no-clean or better yet a water soluble flux should be used. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Joel Alexander Sent: Friday, November 30, 2007 2:25 PM To: [log in to unmask] Subject: [TN] Wave solder flux volume measurements Hi guys its me again, We have a customer that builds power systems for the Telcom companies. They recently had a field failure on a backplane. It had sever corrosion. We process the assembly with a VOC no-clean solder and have never had issues in the past. The customer indicated that the backplane was in a damp/moist environment. That is not a good combination for no clean flux. I suggested cleaning but they insisted that we monitor our flux volume to ensure it is at the recommended application volume. I did not really agree from a reliability standard. Does anyone out there measure their no clean flux volume on a regular basis? Joel Alexander Quality Assurance Manager TT APSCO, INC. --------------------------------------------------- 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 ----------------------------------------------------- ForwardSourceID:NT000C88BE --------------------------------------------------- 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 -----------------------------------------------------