I think you have your answer. HCFC-141b alone is no use for flux removal. I suggest you try the 141b MGX, which contains 4% methanol, which is a polar solvent. This will, at least, give you a better chance of working, without changing your process. The MGX blend is designed for flux removal. Brian Juan T. Marugán wrote: > Brian, > > It's pure. We are being using Forane 141-b DGX, produced by Arkema in the > EU. > > http://www.arkema.com/sites/group/en/products/detailed_sheets/fluorochemic > als/forane/foams_solvents_aerosols/forane_141b.page > > > > --------------------------------------------------- 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 -----------------------------------------------------