Boron Carbide is one of the hardest man-made materials. Its hardness with Mohs hardness 9.36 and microscopic hardness 5400-6300kg/mm2 is only a little less than diamond, its gravity density is 2.52g/cm3 ,melting point at 2450℃.Boron carbide possesses properties of endurance hi/low temperature, no reaction with either acids or alkalis, the grinding efficiency is higher and with no magnetism. It is a good replacement of diamond. It also used for making high quality nozzle etc.