The packing and sealing, constructional, and protective corrosion-, ozone-, and heat-resistant rubbers, the plastics, the Paronite rubberised asbestos fabrics, the ebonites, the asbestos-filled rubbers, the Pantaplast high molecular weight polyethers, and the other materials currently used in different chemical processes, in anticorrosion technology, in engineering, in the aircraft industry, and in other sectors of industry no longer satisfy the increased requirements of industry (refs. 1-25).
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