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BORON CARBIDE ( the structural formula is B4C, and the molecular weight is 55.26 ) is a nonmetallic material for high-performance structuring ceramics. It is also considered the material for high-performance functioning ceramics. It is one of the hardest Man-Made materials (only near upon diamond and cubic boron nitride), its hardness with Mohs hardness 9.36, its density 2.52 g/cm3, and melting point at 2450 ℃. The material possesses properties of endurance, low temperature, no reaction with either acids or alkalis; it also possesses the specialty properties of light quality, high hardness, semi-conductivity, etc. so that it is widely applied as following: Boriding refractory, ion transfuse, lilm layer as well as grinding, polishing, drilling hard metal alloys, jewels, etc. Meanwhile, it is the primary material for the wear-resisting parts, precise meter-age element, precise spray nozzle, sealed washer smelting boron steel, boron alloy, etc. It possesses the characteristic of absorbing the neutron for boron, so boron carbide is also used as the primary boric material for reaction speed adjusting bar in a nuclear reactor.