17 Rubber, raw and semi-worked; polymer material vulcanizable to rubber, namely, polymer sheets, pellets, and sealants comprising cross-linking agents for use in engineered constructions, buildings, offshore-constructions, trains, boats, tunnels, nuclear power plants and for road sealing, pavement sealing, for vessels, aircrafts, railway rolling stocks, power distribution, power generators, industrial furnaces and chemical plants, metal refractory blocks having conduits; plastics in extruded form for use in further manufacture; sealing and insulating materials; flexible insulating sleeves, not of metal, namely, insulating sleeves for use in engineered constructions, buildings, offshore-constructions, trains, boats, tunnels, nuclear power plants and for road sealing, pavement sealing, for vessels, aircrafts, railway rolling stocks, power distribution, power generators, industrial furnaces and chemical plants; sealing plugs primarily of rubber or of polymer material vulcanizable to rubber, fire-resistant sealing plugs made primarily of rubber; fire-resistant and non-fire resistant sealing plugs made primarily of rubber; waterproof packings for sealing pipes and cables; sealing packings, namely, packing material for forming seals; pipe muffs not of metal, for use with plastic pipe; insulating sheaths being insulators for electrical cables; sealing material, namely, uncured and cured rubber for use in engineered constructions, buildings, offshore-constructions, trains, boats, tunnels, nuclear power plants and for road sealing, pavement sealing, for vessels, aircrafts, railway rolling stocks, power distribution, power generators, industrial furnaces and chemical plants; sealing pipe muffs made of uncured and cured rubber for use with plastic pipe or metal pipe; non-metal sealing gaskets, namely, gasket sealer for use in engineered constructions, buildings, offshore-constructions, trains, boats, tunnels, nuclear power plants and for road sealing, pavement sealing, for vessels, aircrafts, railway rolling stocks, power distribution, power generators, industrial furnaces and chemical plants; sealing sleeves made of uncured and cured rubber for protecting parts of machinery; sealants made of polymer material vulcanizable to rubber, namely, waterproof sealants; pipe muffs, not of metal, for use in engineered constructions, buildings, offshore-constructions, trains, boats, tunnels, nuclear power plants and for road sealing, pavement sealing, for vessels, aircrafts, railway rolling stocks, power distribution, power generators, industrial furnaces and chemical plants, metal refractory blocks having conduits