*I pretty much agree with Bev's comments on the preceding material. I recently spoke with a Melbourne based R&D lab who were investigating intermittant failures of circuit boards. They discovered that the populated boards were arriving with 20 to 30 micrograms of NaCl equivalent per sq inch from the manufacturer but could not relate the failures to the ionic contamination. [Bev Christian] Doug? [Doug]: It's possible. Since the measure is micrograms of NaCl equivalent, then it was obtained using a ROSE test, which is a single measure of ionic contamination. I have seen cases in the past where a value of 20-30 had no reliability failures. This could be because the circuits are not very demanding, or were very robust in design, or, as is more often the case, you were getting some form of product from the solder mask, such as a carbonate. Dry film solder masks were notorious for putting out high values by that test when not fully cured. As such, they gave out high ROSE values, but the more detrimental species, such as chloride, may not have been present in detrimental amounts. What I need is some further documented experience on the reliability of circuit boards (Like the publication above) to support or discount my "do nothing" case. *I would look at the assemblies. If there is no particulate residue from the small fire or no other residue, then you are probably safe. My only thought would be if the cooling systems for the equipment may have drawn combustion products down to the board level. If you can't see anything, I wouldn't worry about it. By the way, CSL is located in Kokomo, Indiana. 765-457-8095 Doug Pauls Rockwell --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------