Advantages and characteristics of ceramic sagger (1) High temperature resistance, high refractory temperature and high load softening temperature. (2) Chemical resistance, strong resistance to acid solution or molten slag. (3) Antioxidant. It is not easy to react with O2, H2, CO and other gases. (4) Good thermal stability, stable volume at high temperature, not easy to expand or shrink. (5) Good thermal shock resistance, resistance to rapid cold and heat, and not easy to peel off.