> I would suggest that 85/85 be used rather carefully. > > If you're testing low solids fluxes you may get a false "warm fuzzy." > > Many activators used in low solids no-clean evaporate at 85 C. From the SIR > it looks like you're doing good. But in the real world, i.e. non-85 > operating conditions, your product may have problems. (See John Sohn's work > published I believe at an IPC conference.) > > Also I would not recommend testing boards with plated through holes at > 85/85. Lando et al (many years ago) showed that CAF is the dominant failure > mechanism under these conditions especially if there is any bias. > > I am not a big fan of 85/85 although I had to do a lot of it over the years. > > > I'd be interested in others opinions on the subject. > > Greg Munie > Techies, May I just add my endorsement to Greg's comment. If you are testing no-clean fluxes, it has been shown that 40DegC 93%RH is a more important condition. Once flux residues are exposed to temperatures above around 40 to 50 C, they volatise - hence the "warm fuzzy" Greg refers to. (BTW, this is not an approved expression here in old Blighty!) :-) -- Regards, Graham Naisbitt [log in to unmask] Mobile: +44 (0)79 6858 2121 Concoat Limited - Engineering Electronics Reliability Web: www.concoat.co.uk AND www.concoatsystems.com NOTE: NEW ADDRESS :NOTE Sales: Millfield House, Fleet Road Fleet, Hampshire GU51 3QF UK Phone: +44 (0)1252 813706 Fax: +44 (0)1252 813709 Manufacturing and Head Office: Alasan House, Albany Park Camberley, Surrey GU16 7PH UK Phone: +44 (0)1276 691100 Fax: +44 (0)1276 691227 --------------------------------------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------