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Polycarbonates have interesting possibilities as materials for capacitor films. In mechanical and electrical properties, polycarbonates fall generally between polystyrene and Mylar, and possess an unusually low temperature coefficient of dielectric constant. They can be cast from solvent and can be metallized; hence, they are adaptable to lacquer film techniques. This paper reports a preliminary evaluation of polycarbonates as capacitor dielectrics. Further work needs to be done on optimizing composition, molecular weight, and chemical purities.