Graphite saggers are mainly made of high purity graphite materials. They are suitable for the photovoltaic industry and the lithium battery industry, and are commonly used in lithium batteries and lithium iron phosphate material sintering. They are used as vessels for loading cathode materials in high temperature sintering process. The graphite crucible with side wall opening avoids dust the phenomenon, improves the reducing high-temperature sintering atmosphere, and enhances the material properties. Graphite crucibles can also be used in non-ferrous metal smelting, such as copper, aluminum, zinc, silver and others.