At General Atronics, we use Zuken-Redac "Visula" CAD systems to design our Printed Circuit Boards. The system can analyze crosstalk, can calculate line-loss, impedance, and also give thermal analysis. In order to use this resource, I need to input several properties that I can't seem to find on product bulletins from laminate manufacturers. They are: Electrical Conductivity (in Siemens (same as Moh) per meter) Relative Permeability Thermal Conductivity (value in watts per meter per K) Specific Heat (in Joules per K per kilogram) If anybody out there can help, I would greatly appreciate it. Thanks. Tom Hybiske General Atronics Corp. 1200 East Mermaid Lane Wyndmoor, PA 19038 215-242-7310 (voice) 213-233-9947 (fax)