High alumina brick with high bauxite as the main raw material, with soft raw clay as a binder, after molding and firing by about 1500 â?? high temperature . According to the content of Al2O3,high alumina brick could be divided into three levels: I Level high alumina brick : the Al2O3 content is more than 75% II Level high alumina brick: the Al2O3 content is between 60% and 75% III Level high alumina brick: the Al2O3 content is between 48% and 60% Its softening temperature of not less than 1400 ~ 1530 â??.
