17 Adhesive thread sealants; pipe couplings and gaskets not of metal; plastic hose; plastic pipe; flexible pipe not of metal; non-metal gaskets for use in biopharmaceutical, chemical, petrochemical, food, beverage, dairy, oil and gas, power, pulp and paper, and semi-conductor fields; plastic hose for gas and fluid use in biopharmaceutical, chemical, petrochemical, food, beverage, dairy, oil and gas, power, pulp and paper, and semi-conductor fields; plastic pipes for gas and fluid use in biopharmaceutical, chemical, petrochemical, food, beverage, dairy, oil and gas, power, pulp and paper, and semi-conductor fields