17 Unprocessed and semi-processed rubber, gutta-percha, gum, asbestos, mica and substitutes for all these materials; plastics and resins in extruded form for use in manufacture; packing, stopping and insulating materials; flexible pipes, tubes and hoses, not of metal; fluorinated synthetic rubber; FKM, namely, fluoro rubber; FPM, namely, fluoro rubber; fluoroelastomer; fluoropolymer; plastic and plastic substances; vulcanized fiber and vulcanite; plastics for use in manufacture; semi-worked polymer resins; rubber powder; synthetic rubber in the form of powders