Larry, We show the core buildup construction on the pwb drawing, and the material is defined as "fabric, metal clad, e-glass, type gf, flame resistant per ipc-4101/x. I don't think there is any practical way to actually create one p/n to designate your matl. Tom Kropski Sierra Technologies, Inc ################################################################ 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################