Semi-finished products of plastic, namely, sealing and packing material, in the form of plates, sheets, rods, tubes, belts namely plastic tapes for the manufacture of non-metal sealing rings for use as connection seals and stuffing box packings; finished goods of plastic, namely, seals with or without inserts in the nature of non-metal flange gaskets for use in bolted connections; finished goods of plastic, namely machined, molded or braided stuffing box packings or shaft packings