TechNet, We are investing setting up a small lab to do microvias in flex circuits using a reactive ion etcher (RIE plasma etcher). What Class of clean room should I establish to do this work in? What kind of holding fixtures are used in the fabrication process? What kinds of dielectric material (spin on polymers) are you using? Thanks, Nancy ############################################################## 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 ##############################################################