Rubber, gutta-percha, gum, asbestos, mica, all the foregoing being unprocessed or semi-processed; plastic materials and resins in extruded form used in manufacturing operations; packing, stopping and insulating materials used for industrial or commercial packing; extruded plastic materials for use in manufacturing operations; insulating fabrics; insulating sealing membranes; rubber waterproof membranes used for manufacturing operations; polymeric waterproof membranes used for manufacturing op...