Joseph, How do you propose to clean? What is the cleaning medium and temperature; rinsing methods and, most particularly, your drying technique? As many of the newer process materials contain surface tension reducing agents (tensides or surfactants), the potential take-up of residues may cause you problems. Regards, Graham Naisbitt __________________________________________________________________________ [log in to unmask] Concoat Ltd Alasan House, Albany Park Camberley GU15 2PL UK http://www.concoat.co.uk -----Original Message----- From: Kane, Joseph <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: 02 February 1998 14:59 Subject: [TN] Moisture Sensitive Parts >Anyone: > >Question on double sided SMT, RMA paste. After side 1 reflow, we plan >to semi-aqueous clean (followed by a short bake at 85C) before any work >on side 2. Will the short exposure to DI water in the rinse phase lead >to any appreciable moisture uptake in PEM's? Or does the mechanism >involve longer term exposure to atmospheric moisture? We could test >samples, weighing before and after, but since the mix is considerable, >advice on whether this is necessary would be welcome. > >Joe Kane >Lockheed Martin Control Systems > >################################################################ >TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c >################################################################ >To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: >To subscribe: SUBSCRIBE TechNet <your full name> >To unsubscribe: SIGNOFF TechNet >################################################################ >Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. >For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 >################################################################ > > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################