High purity graphite generally refers to the amount of carbon containing more than 99.99% of graphite in the organizational structure can be divided into three categories: coarse grain structure, fine grain structure and fine grain structure. The base material for integrated circuits is mainly single crystal silicon chip, silicon single crystal growth process is currently mainly used in Czochralski (CZ) method, and other methods of magnetic Czochralski method (MCZ), regional (FZ) method and double crucible pulling method, the total amount of single crystal silicon 80% monocrystalline silicon with the global electronics industry. Czochralski graphite furnace is monocrystalline silicon using consumables, high purity graphite materials into the heating system of monocrystalline silicon furnace. In 2005 China needs to be directly drawn silicon single crystal furnace with graphite about 800 t. [1]

　　Another important use of high purity graphite is processed into various kinds of crucible, used for the production of precious metals, rare metals or high pure metal, non-metallic materials. Graphite electrode is also a kind of high purity graphite, which can be used for the spectral analysis of all elements except for carbon. The impurity content of finished product should be less than 6*10 were prepared by chemical method and standard sample collection for impurity spectrum of pure carbon powder or graphite pure spectrum in spectrum analysis, the two kinds of high purity materials of impurity content requirements are at 6 *10; in some cases, to the carbon content reached 99.9995% the total ash content of less than 5 *10. The molding methods of high purity graphite include three kinds of forming methods, such as extrusion, molding, and static pressing. Table 9 the physical and chemical properties of high purity graphite products made in China

　　High pure graphite is widely used in casting, metallurgy, mold and other industries, high precision CNC machining equipment for production of horizontal continuous casting with high purity, high strength, high density graphite crystallizer and the electronics industry with a graphite mold; metallurgical industry graphite mold and other various shapes, various uses ink stone processing of finished parts to realize, the needs of machining precision and roughness of graphite.

　　High purity graphite material has outstanding features.

　　1. Thermal stability: the reliability of the product quality is guaranteed by the special design of the conditions for the rapid quenching of the graphite crucible..

　　2. Erosion resistance: matrix design fine uniform delay crucible erosion degree. Impact resistance: graphite crucible can withstand the high thermal shock intensity, so any process can be assured to.

　　3. acid resistance: the addition of special materials significantly improve the quality of the crucible, in the acid resistance of the outstanding indicators, and greatly extended the life of the graphite crucible.

　　4. high thermal conductivity: high content of fixed carbon ensure good thermal conductivity, shorten dissolution time, and significantly reduce the energy consumption.

　　5. metal pollution control: the strict control of the material composition, guarantee the dissolution of the graphite crucible no pollution to the metal.

　　6. the quality stability: the production technology and the quality guarantee system of the high pressure forming process guarantee the stability of the quality.