17 Indiarubber in the Form of Sheets, Blocks, and Rods Used in Basic Manufacturing Processes; Plastics in the Form of Sheets, Blocks, and Rods Used in Basic Manufacturing Processes; Indiarubber Valves, Rings, Coupling Sleeves, Springs, and Dampers for Absorbing Shock; Indiarubber and Plastic Hoses and Tapes; Packaging Tape; Indiarubber and Plastic Materials Used in Packaging as a Packing Material and for Insulating