High chrome bricks are made of industrial grade chromium trioxide and alumina as the main raw materials, or introduce a small amount of zirconia, etc., after high temperature firing, the content of chrome trioxide is not less than 75%, chrome trioxide, alumina and Shaped refractory products with a total content of zirconia not less than 98%. It has excellent corrosion resistance, high compressive strength at room temperature, high strength at high temperature, excellent wear resistance, high refractoriness, excellent thermal shock resistance, and good volume stability at high temperatures.
High chrome bricks are divided into four grades according to the content of chrome trioxide: GGZ-75, GGZ-85, GGZ-90, GGZ-95. In the grades, G, G, Z- are the initials of the Chinese phonetic alphabet of Gao, chrome, and brick respectively, and the Arabic numerals are the mass fractions of chromium trioxide.