Sealing materials, packing materials and insulating materials; semi-finished articles of plastic, namely, semi-finished products in the form of foils, plates, rods, profiles, hoses, tubes, and blocks; insulants in the nature of electric, thermal, and acoustic insulators; soundproofing materials, included in this class; packing materials of rubber or plastics for cushioning and stuffing; insulating materials of metal; insulating foils of metal; structural parts and fittings for all the aforesa...