Hi Jeff OK. I'll bite. Who makes such circuits? Are they UL approved? Thanks for anything provided. Gerry -----Original Message----- From: McGlaughlin, Jeffrey A [SMTP:[log in to unmask]] Sent: Friday, May 01, 1998 7:26 AM To: [log in to unmask] Subject: Re: [TN] FR4 material/Rogers material compatibility? Mitch - I personally worked on one 4 layer design for an RF Transmitter that used a sandwich of 2 RO4003 cores an a center layer of FR-4 prepreg. This design preformed extremely well and was simple to tune. I have also bonded RO4350 with G-tek prepreg which formed a very rigid and thermal stable PWB. Contact me off-line and I can recommend a fabricator for these types of PWB's. Jeffrey A. McGlaughlin [log in to unmask] Printed Circuit Board Designer Battelle Memorial Institute Columbus Ohio -----Original Message----- From: Mitch Morey [SMTP:[log in to unmask]] 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 ################################################################ 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 ################################################################ ################################################################ 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 ################################################################