Rubber; substitutes for unprocessed and semi-processed rubber; gutta-percha; substitutes for unprocessed and semi-processed gutta-percha; gum; substitutes for unprocessed and semi-processed gum; asbestos; substitutes for unprocessed and semi-processed asbestos; mica; substitutes for unprocessed and semi-processed mica; plastics in extruded form for use in manufacture; packing, stopping and insulating materials; flexible hoses, not of metal; couplings of plastic for pipes; junctions, not of metal, for pipes.