Season's Greets, A query (actually re-query) to those in the know on the usage of plastic microcircuits instead of ceramics. I have some component guys who have ruled that plastic parts can only be assembled on a no-clean flux line. Anyone using a rosin (RMA) flux is dis-qualified from assembling for us. I know the theory is that the microcracks formed at reflow temperatures will entrap corrosive residues, but I have trouble buying the NO-CLEAN GOOD, ROSIN-BAD generalization. Opinions? Ralph Vaughan Boeing-Atlanta ################################################################ 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################