Rubber, gutta-percha, asbestos, mica; plastics in extruded form for use in manufacture; packing, stopping and insulating materials, other than for use in building, namely, waterproof sealants, isolation materials, namely, rigid graphite felt, flexible graphite felt, graphite felt, in particular infiltrated and/or coated with pyrolytic carbon, carbon fiber reinforced carbon ("CFRC") sheets for ovens, high temperature applications and the photovoltaic industry; flexible pipes, not of metal; sem...