I apologize if this question has been covered previously. IPC J-STD-001B states that assemblies shall contain less than 1.56 micrograms/sq.cm. NaCl equivalent ionic or ionizable flux residue. There is additional wording about other methods and comparing sensitivities but I am unclear as to whether or not the equivalence factors in the Naval Materials Research Report 3-78 can be applied. In that report the 1.56 micrograms/sq.in. translates to different acceptance limits for different instruments: 2.2 micrograms/sq. cm. for Omegameter 3.1 micrograms/sq. cm for Ionograph 5.1 micrograms/sq. cm for Ion Chaser Can IPC J-STD-001B be interpreted to include these historical equivalence factors? Thanks in advance for any help you can give me. Mary Davis Hughes Aircraft Co. Naval & Maritime Systems ############################################################## 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. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################