Unprocessed and semi-processed rubber, gutta-percha, gum, asbestos, mica; mica; plastics in extruded form for use in manufacture; plastic films for use on windows; packing, stopping and insulating materials; flexible pipes, not of metal; insulation and barrier articles and materials, including thermal insulation articles and materials, electrical insulation articles and materials, electrical insulating paints, acoustic insulation articles and materials, fire resistant and fire preventive arti...