I need to obtain information and vendor contacts on antitarnish materials used for current flexible and rigid PWB processing in outside industry. Some of the information I need is: 1) What are the antitarnish chemicals currently used and what are their chemical compositions? 2) How, when, and where in the PWB fabrication processing are the antitarnish materials applied? I need information especially for flexible circuit processing (print & etch, plated). 3) What are the major problems associated with using antitarnish materials? (solderability issues,...) 4) Are antitarnish materials used in separate processing tanks or with rinse waters on conveyorized equipment? If so, how? We are experiencing discoloration on copper clad flexible material currently cleaned prior to coverlay lamination in next assembly (Purple Plague). Any information and companies that I may contact on this subject would be greatly appreciated. Thanks, Joe Slanina 816-997-4012 ************************************************************ AlliedSignal Federal Manufacturing & Technologies This e-mail message has been scanned. ************************************************************ ############################################################## 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 Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################