Abstract: The present invention includes a high performance communications cable exhibiting reduced cross-talk of any form between transmission media that includes one or more core support-separators having various shaped profiles which define a clearance to maintain a spacing between transmission media or transmission media pairs. The core may be formed of a conductive or insulative material to further reduce cross-talk and improve other electrical properties as well as reduce flame and smoke spread. The cable and separators are comprised of principally polymer blends that include olefin and/or fluoropolymer and/or chlorofluoropolymer based resins with and without inorganic additives such as nano-clay composites. These unique blends offer both flame and smoke suppression while maintaining the characteristics necessary to improve electrical performance and allow for severe cost reduction over conventional separators.