All No clean really means is no need to clean because the residues are believed safe and look OK.. [RMA fluxes are believed safe but look messy.] However most people equate no clean with low residue and give themselves a hard time as a result. A number of companies can supply you with repair fluxes which are noncorrosive, not dependent on "burn off" for safety and can be removed if required. These products are effectively solderless solderpastes. They do have slightly higher residues, but whether or not these are acceptable to you you will have to try - there is no way of technically assessing aesthetic appearance. If you can't locate a suitable supplier feel free to come back to me and I can pass on a US companiy. Mike Fenner BSP UK. [log in to unmask] ----------------------------------------------- Subject: Subj: No-clean Repair Author: [log in to unmask] at internet Date: 11/6/96 1:37 PM I have a question concerning repair of a CCAs soldered with no-clean flux (hand soldered and/or wave soldered). If you need to repair/rework the CCA, do you use an RMA flux for the repair/rework or no-clean flux? If you use a no-clean flux, how do you know if you have flashed off all the flux that was applied? Wave soldering pretty much covers the entire bottom side flashing off the no-clean flux, however, a soldering iron may not do that. If you use an RMA and clean then it would seem you are defeating the purpose of the no-clean. Will that cause a problem since the rest of the CCA was soldered using no-clean? I have heard of cleanable no-cleans, but, what if you are not using a cleanable no-clean. Could someone straighten me out on this issue? Thanks! *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************