Charles There is an IPC publication by the Low Solids Flux Task group, which involved investigations and reports from Les Hymes, that would be a good reference for you. This publication discusses the multitude of parameters to consider when making the switch you are considering. Good luck! Pat Kane Contamination Studies Laboratories ############################################################## 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 ##############################################################