Insulating material, namely, small granulated spheres of plastic for further processing into insulating material; gutta-percha, rubber, and balata not included in other classes; substitutes for gutta-percha, rubber, balata, namely, synthetic rubber, not included in other classes; films, sheets and rods of plastics in extruded form for use in manufacture; packing materials of rubber or plastics; seals, namely, sealing and insulating material