Abstract: The pad of the present invention is comprised of a thin film of high dielectric strength material which is impregnated with diamond powder. The diamond pieces are relatively uniform in size and have a minimum dimension which is greater than the thickness of the film. In one embodiment, a 5,000-10,000 angstrom boundary layer of copper is formed on both sides of the film by a vacuum deposition or electroless dipping and thicker cover layers are electroplated on top of this boundary layer, if desired, to make the pad rigid. In addition, a copper or aluminum substrate can be clad to one or both cover layers to provide additional rigidity.