It’s made of industrial alumina or natural superfine bauxite and high-purity caustic Calcined Magnesite powder by high-pressure sintering and fine grinding in UHT converter, characterized by big hardness, small coefficient of thermal expansion, etc. it is ideal raw material of ladle castable and magnesium-spinel bricks. It’s extensively applied to the lining of converter, glass kiln, open hearth, casting ladle etc.