耐火制品的制造

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