The ability to remove organic flux residues from under the small gaps beneath most SMDs is the main concern. Otherwise, organic fluxes have been extensively used in soldering conventional assemblies with good results. Harold Papazian. -----Original Message----- From: Stephen R. Gregory [SMTP:[log in to unmask]] Sent: Friday, June 16, 2000 2:34 PM To: [log in to unmask] Subject: [TN] Generic question about Flux types... Hi ya'll!! I gotta generic question about flux types. We do quite a few boards here that still call out that the assembly is to be built to MIL-STD-2000 specs, and as has always been here, RMA flux is always used. My question is, what is the REAL reason to use an RMA? I've been under the impression that because a RMA is not as active as an OA, any residues that might be left behind from the RMA wouldn't be as harmfull as OA residues would be. But if you always ensure that you clean your boards thoroughly, what difference does it make whether you use an RMA or an OA? -Steve Gregory- ############################################################## TechNet Mail List 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://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ############################################################## ############################################################## TechNet Mail List 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://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################