Hello I'd like to throw my 2 cents in. We have gone through a painfully time with corrosion. RMA flux-YES it can cause problems with components. YES it does get into the fine cracks in the lead egress. LEDs for instance(with current limiting resistors) can crack during wave or IR processing. Aqueous cleaning drives in contaminants and causes rapid corroison-DEAD components. We have seen flux entrappment in FETs in TO220 style packages-causing leakage paths between leads. Many components are sensative to the halides and chlorines in RMA that are not cleaned properly. One thing we learned, cleaning is paramount! You could use any chemistry however, you must thoroughly clean the product. Aqueous cleaning tank reservoirs must be measured for dirt(ionics). We found extensive humidity testing would provide the data supporting cleanliness. Corrision quickly grows like a yeast fungus on bread, in humidity. Proudly, we are at a point where our process is 100% NO-CLEAN. Our chemistries both at the front end are compatible with the repair and field service organizations. We are doing quite well with controlling corrosion. Obviously there is more behind the scenes than I can list in a memo. Good Luck-we did it. You can too! %&&&&&&&&&&&&&&&&&&&&&&&&&&&% Don F. Fumia [log in to unmask] Schneider Automation No. Andover MA 508-975-9344 FAX x9714 %&&&&&&&&&&&&&&&&&&&&&&&&&&&%