Douglas, This began with a customer identifying dendritic growth on a board group we sent them. In evaluating possible causes of course we pursued our process including cleanliness, currently we are doing this as a cleanliness evaluation. We have decided to begin performing this test method, among others, as another means of process control; however, all information I have seen thus far states exactly what you've stated, the longer time lapsed before failure, the cleaner the board. My question I suppose, how long will it take for an exceptionally clean board to fail? Thanks, Franklin ############################################################## 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 ##############################################################