... main raw materal at high temperature.It's chemical composition contains Al2O3, TiO2, and small amount of SiO2, and Fe2O3, etc,. Microhardness:1800 ... articles made of it is suited for grinding metals of high-tensile strength such as steel, annealed malleable iron and hard bronze etc ... in china . we are you welcom you come to visit if you have free time in china. Hongtai Hot selling!!! high purity brown ...