Refractory castables can be used to create the monolithic linings within all types of furnaces and kilns. They can be further classified into the following sub categories: conventional, low iron, low cement, and insulating for installation either by gunning or manually. There is a wide variety of raw materials that refractory castables are derived from, including chamotte, andalusite, bauxite, mullite, corundum, tabular alumina, silicon carbide, and both perlite and vermiculite can be used for insulation purposes. Conventional castables are created with high alumina cement and can withstand temperatures from 1300 ºC to 1500 ºC. Dense Castables is used as lining turning kiln, hot converter lining heat treatment furnace, furnaces of metallurgy industry, chemical industry and construction industry, circulation part of furnaces from 1300 ºC to 1800 ºC.