High-alumina bricks at around 80% Al2O3 can be produced from a variety of different high-quality raw materials and therefore have a correspondingly wide range of properties and applications.
In principle, the average composition is close to that of the mineral mullite (approx. 72 % Al2O3, approx. 28 % SiO2) in order to take advantage of its refractory properties (melting point 1,800 °C). The individual properties of the products are therefore predominantly determined by the raw materials used and their secondary components.
The raw materials can be alumina-enriched andalusite, bauxite, pre-fired mullite, tabular alumina or corundum and suitable mixtures thereof. These materials are used, for example, for the linings of incineration plants, to line vessels in metallurgy or corrosion-resistant undercasting frames for steel ingot casting, but also as high-quality kiln furniture.