17 Extruded PVC product used to produce frames to be filled with air for use in the manufacture of windows and doors; natural rubber; threads of rubber, not for use in textiles; clack valves of rubber for use in the manufacture of plumbing pipes; cords of rubber; plastic fibres, not for textiles use; plastic substances, semi-processed; plastic films for packing, cushioning, or stuffing purposes other than for wrapping; threads of plastic materials, not for textile use; flexible tubes, not of metal; hoses of textile material; compressed air pipes, not of metal, namely, flexible PVC pipes; extruded plastic in the form of bars, blocks, pellets, rods, sheets and tubes for use in manufacturing; plastics pressurized tubing, namely, plastic tubes for use in plumbing; plastics elastomare films, namely, plastic film for packing and stuffing; laminate foils consisting primarily of plastic with or without a metal layer for application to a substrate; films used as industrial or commercial packaging; plastics laminates, namely, plastic laminated films for use on windows; plastics moulded material, namely, semi-finished injection molded products of plastic for use in a variety of industries; flexible plastic plumbing pipes; unplasticised plastics, not for textile use, namely, unrigid PVC-sheetings, for use in the manufacture of windows and doors, but not for textile use