17 Plastic film, other than for wrapping; polypropylene films, other than for packaging; polyurethane film, other than for wrapping; polymer films for use in the manufacture; plastic films for dye sublimation printing; unprocessed and semi-processed rubber, gutta-percha, gum, asbestos, mica and substitutes for all these materials; plastic materials and semi-finished resins used in manufacture; packing, stopping and insulating materials; flexible tubes, not of metal.