Would Conformal coating provide better protection... No need to use and potentially entrap all these corrosive chemicals. Alain Savard, B.Sc. Chemistry Chemical Process Analyst CAE Electronics Ltd. -----Original Message----- From: Ralph Richart Subject: [TN] still confused We have answers.... So I had a long talk with my customer this morning to provide input based on the invaluable advice from you all. I said - "is there a specific reason for choosing 3-8u" of immersion gold over tin/lead solder?" He said - "absolutely, the gold provides corrosion resistance, the gold does not" I said - "even such a thin amount - only 3-8u"?" He said - "definitely, all we need is the coverage, the thickness is irrelevant" Is this true? Needless to say, we are rebuilding the parts as we speak. Rework sounds difficult to say the least, although I may try to come up with some scheme for fun as they have a bunch of boards that are no good right now. thanks for all the help..... ralph ############################################################## 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. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################