Unprocessed and semi-processed natural rubber, gutta-percha, gum, asbestos, and mica; plastics and resins in extruded form for use in further manufacturing; packing and insulating materials; flexible pipes, tubes and hoses, not of metal; acoustic insulation articles and materials; fire resistant and fire preventive articles and materials in the nature of thermal and acoustic insulators; thermal insulation articles and materials; building insulation for building purposes; insulating materials ...