Compared with sintered mullite, high-purity fused mullite is more prominent in terms of properties, such as high temperature mechanical properties, erosion resistance and so on. In addition, fused mullite also has a special performance in terms of color, such as ordinary fused mullite is dark or black; High purity fused mullite is light gray; At a certain temperature, it is different, ordinary fused mullite becomes light yellow, and high-purity fused mullite becomes white.