Encyclopedia
Mullite
4. Mullite, a material obtained by thermal treatment of sillimanite, kyanite or andalusite or by melting a mixture of silicon dioxide or clay and aluminum oxide in electric furnaces; used for production of refractory products with high thermal resistance
Source: "Explanatory Notes to the Harmonized System of Goods Nomenclature for Foreign Economic Activity of the Russian Federation (HS FED Russia)" (prepared by Goskomstat RF) (Volume 1, Sections I - VI, Groups 1 - 29)