plastics in extruded form for use in manufacture, packing, stopping and insulating materials, flexible pipes not of metal, namely, acoustical insulation barrier panels, acoustical insulation for buildings, acoustical panels for buildings, blankets for water heaters, building insulation, cable insulation, electrical ceramic insulators, electrical insulating tape, glass fiber electrical insulating tape, vulcanized fiber for use in the manufacture of electrical and building insulation, fiberglas...