Abstract: The invention provides an optical fiber comprising a cladding and a core wherein the cladding comprises a terpolymer comprising:(1) about 50 to about 90 mol. % of vinylidene fluoride,(2) about 8 to about 45 mol. % of trifluoroethylene and(3) about 2 to about 15 mol. % of hexafluoropropylene or perfluoro(alkylvinylether).

Abstract: A non-electrification polymeric composite material composed of 60-95% by weight of a copolymer of perfluoro(alkyl vinyl ether) and tetrafluoroethylene (PFA), 1-10% by weight of electrically conductive carbon, and 5-20% by weight of carbonaceous fiber powder. The weight ratio of the electrically conductive carbon contained in the polymeric composite material to the carbonaceous fiber powder also contained in the material in from 1/9 to 7/4, preferably from 2/8 to 5/5. The polymeric composite material is especially suitable as a semiconductor holder, particularly for semiconductor wafers.