The cupolas have a good thermal efficiency because the metal to be melted is in direct contact with burning fuel. One very important problem of this melting furnace is the durability of the lining. Due to the fact that the repairing needs bricks but also mortar, the combination of these two kinds of refractory materials of different prices, the establishment of a good proportion is obvious. This paper presents some economical data to establish the optimum alternative in order to improve the durability of cupola lining, obtaining in the same time an important economy.
