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A material consisting of gas and polymer in a closed cell structure is called a foam. An insulation material that is foamed will have a lower dielectric constant and dissipation factor than the solid material. A polymer with a low dielectric constant, when foamed, will yield cable designs that are smaller and lighter than electrically equivalent designs using solid insulation materials. This paper describes the basic properties of such a polymer. Data is presented on the mechanical properties of wires insulated with this foamed material. Theoretical electrical properties and calculated polymer weights for MIL-STD-1553B data bus constructions are also presented. THE COMMERCIAL COMPUTER and telecommunications industries are driven by the demand for more information and faster communications. The cable designer has the task of providing voice and data communications at higher speeds, over longer distances, and with less signal distortion or loss.