Corundum bricks of ≥ 90% Al2O3 are manufactured using synthetic fused corundum and sintered corundum and finely grained highly aluminous raw materials with ceramic and chemical bonding. Sophisticated bricks and large blocks with 65 % to 99 % Al2O3 content are shaped by vibration shaping or slip casting and fired at high temperatures in modern firing plants, apart from compression shaping on modern hydraulic presses.
Carefully defined additives of raw materials with chromium and zirconium content improve the service life span of the corundum bricks against CaO-FeO-SiO2 slags and glass melts, and are used in waste incineration plants and blast furnaces, and melters for colored glass and glass fiber. Corundum bricks with a 99 % Al2O3 content are also resistant at high operating temperatures in CO atmospheres and hydrogenous atmospheres.
They are therefore used in furnaces for the chemical and petrochemical industry under strongly reducing conditions. The precondition for an optimal and appropriate choice of a brick quality within the balance of prices and terms and conditions is to review all detailed knowledge about the kind of application with the customer.