Doug, I totally agree. I assumed that since he chose no-clean they already ruled out the use of Conformal Coat. I require it unless they have a dam (hint- keep moisture out) good reason. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls Sent: Monday, December 03, 2007 7:52 AM To: [log in to unmask] Subject: Re: [TN] Wave solder flux volume measurements While I do not disagree with Dewey, I think this is less about what kind of flux is used and more about this being a conformal coat issue. It sounds like they have a damp environment, but are not conformally coating the boards. As I tell our designers here, if you have a condensing environment, you either put the $$$ into the coating or the $$$ into the housing. You have to provide an environmental barrier somewhere. Doug Pauls "Whittaker, Dewey (EHCOE)" <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 12/03/2007 08:46 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to "Whittaker, Dewey (EHCOE)" <[log in to unmask]> To [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 ----------------------------------------------------- --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------