I have a question regarding soldering assemblies after they have been confromal coated. This is for a DOD customer and we do all soldering with RMA flux. Here is the scenario: We solder all the components into a PWB in our wave solder machine using RMA flux. We mask all the wire entry holes that are to be soldered later. The boards get tested, cleaned; cleanliness tested and conformally coated with polyurethane, except for the holes that will be soldered later. They then go into the next higher assembly in which a large number of wires are attached. Due to the size and shape of the assembly at this point it is difficult to clean in any sort of a batch system. We currently bench clean with IPA (ProClean), rinse with IPA, dry and brush conformal coat over the connections. Finally my question is, what would you see as a problem with soldering these wires using no clean/low residue flux and brush confromal coating over the connections? How would you qualify this process since conventional cleanliness testing is out of the question due to size and condition of all the other material attached to this assembly now, (wires, sheet metal, thermal compound, etc). This would obviously be a considerable saving due to the tremendous amount of cleaning we currently do. All comments and suggestions are greatly appreciated. KennyB Ken Bloomquist Sr. Principal Process Eng. PRIMEX Aerospace Company [log in to unmask] (425) 881-8990 ext. 6645 ################################################################ 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 ################################################################