Calcined Kaolin. This material is often underutilized in traditional ceramics, people do not realize its true value. Kaolin is pure clay mineral, having a fired chemistry of 1 part Al2O3 and 2 parts SiO2. But the raw clay crystals are hydrated, having 12% crystalbound water. This is the secret to their plasticity.
Kaolin forms an initial raw material for the ceramics industry and for paper production. Nevertheless, it is also used in many applications in the chemical and other industries. Sedlecký Kaolin, produces washed kaolin, which can be further processed into calcinated fillers and heatresistant sharpeners.