Chris I agree with Father Doug. How long is a piece of string? I can think of cases where 1.5 ug/cm2 eq. NaCl (the more modern figure, roughly the same as Doug's) is grossly insufficient and others where it is gross overkill. Would you apply the same standards to a satellite, a submarine repeater, a personal computer and a Gameboy? At the best, ionic contamination testing is a yardstick to ensure your process remains constant. If the results drift up or down, then you know something is happening, which may have undesirable effects on the reliability. Also, ionic contamination is not the be all and end all of ensuring reliability. I've seen many failures of electronics assemblies because of non-ionic contamination. There is no easy way of measuring the latter, or gauging its effect on reliability. There is only one way of determining reliability: build some assemblies and test them under real worst-case working conditions for the number of years you need them to operate. When you have done this, you can establish your manufacturing protocol. Of course, this is not practical, so one tends to err on the safe side (over-engineering) and one tries to do accelerated testing, which often bears little correlation to real life. However, if one logs carefully all failed assemblies that come in for repair and diagnoses the fault mechanism, it is often possible to slowly improve the process, possibly even reducing costs. Brian Christophe CROCOMBETTE wrote: > > Hi folks, > > Does anyone know if a standard related to the cleaning of electronic boards and connectors has been issued by any standard organization (IPC, ...) ? > > If anyone has an internal procedure from his/her own company, I would be interested in getting some inputs > > Thanks > > Chris > > --------------------------------------------------------------------------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL > Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information, or 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 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------