Manufacture of refractory products

This class includes: - manufacture of refractory mortars, concretes, cements. - manufacture of refractory ceramic goods: + heat-insulating ceramic goods of siliceous fossil meals. + refractory bricks, blocks and tiles. + retorts, crucibles, muffles, nozzles, tubes, pipes. This class also includes: manufacture of refractory articles containing magnesite, dolomite or chromite.