We're talking with our customers about converting from RMA to an ORH1 water soluble flux for wave soldering. We've completed qualification testing per J-STD-001, but they have some questions. We'll be cleaning with an in-line system right after wave. Before conformal coat, we plan to clean 100% in a batch system with 75% isopropanol and DI water. Sump resistivity is monitored, so we will be performing 100% ROSE test on each lot. Customer wonders what happens if there is any WSF residue at all left on the boards between the time they are cleaned with the in-line and the final cleaning stage. Allowing time for hand soldering and Genrad test, this is usually a day or two, but in the extreme, it could be weeks. They have the impression that WSF residues are strongly corrosive, and the boards could turn to mush. We have a board that was soldered in November and hasn't been cleaned, and solder joints are still shiny. Question is this - any known instances of corrosion happening in an air-conditioned shop? Joe Kane BAE SYSTEMS Controls Johnson City, NY --------------------------------------------------- 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 -----------------------------------------------------