I have a "similar" question which hopefully someone can answer. I've been asked by our engineering group if FR4 material, is compatible with the Rogers 3000 and 4000 materials? We'd like to make a board using the Rogers material for some circuitry and FR4 material with the other circuitry. Any luck? Mitch Morey Sr PCB Designer NSI Communications (was ComStream Corp) San Diego CA >>> FRANCEYJ <[log in to unmask]> 04/30/98 10:14am >>> Ed Your customer is probably asking for "tetrafunctional" epoxy (FR4) which has comparatively higher Tg and chemical resistance (to "difunctional epoxy"). Your laminate or board supplier will advise. ################################################################ TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################