The tank spouts and parts of the tank super-structure of soda-lime-flint glass melters for the production of flat and container glass are mostly lined with fused-cast blocks today. Beside baddeleyite and corundum, these materials contain - depending on the brick grade in different concentrations - a corresponding amount of a high silicic acid glassy phase. It is known that, on account of the production process, the texture is non-homogeneous. It turned out time and again in industrial operation that especially in high-stress tank areas, such as throat, corner blocks and dam, those blocks are subject to substantial wear. The corrosion follows chemical and mechanical courses and leads to faults in the glass caused by crystalline inclusions that are surrounded by alumina cords.
