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| - The aqueous dispersion of polymer employed is a dispersion of polytetrafluoroethylene (Teflon dispersion 852-201), which is believed to be an emulsion as described in US. Patent 2,613,193, containing about 5%, by weight of the total, toluene, about 2%, by weight of the total, of surfactants such as lauryl sulfate and an alkylaryl polyalkylene oxide ether, the remainder being the polymer and water,
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