The manufacturer of MC3D is Glasteel Industrial Laminates. You can contact to Tel: 901-853-5070 & Fax: 901-853-8664. MC3D is a composite laminate compring polyester & glass fabric. DK is 3.89 at 1 GHz. J.H.Lee Daeduck ELectronics Co KOREA ################################################################ 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 ################################################################