Sillimanite bricks are divided into 65 and 60 sillimanite bricks according to the index.

Sillimanite bricks are thermal insulation bricks made of sillimanite minerals. Sillimanite is converted into mullite and free silica after being calcined at high temperature. It is usually manufactured by high-temperature firing method and drilling mud pouring method. The physical and chemical properties of high-alumina refractory bricks are improved, with a refractoriness of 1770～1830℃, and the starting point of softening under load is 1500～1650℃. It is mainly used for the formation of the liquid hole of the laminated glass tank kiln, the charge of the iron-making blast furnace, the throat and the ceramic craft kiln furniture.

Sillimanite is this kind of high-quality fireproof raw material. It is used to produce high-alumina refractory bricks with low stress relaxation, high-load softness and slightly swelling high-fired shock bricks and heating furnace roofs. The concrete rotating cellar is made of polyphosphate and high-alumina. Refractory bricks, etc.