... hardness is 9.36, 2.melting point 24500c, 3.density 2.51g/cm3 Boron Carbide, a black powder, is the hardest of ... the conventional abrasives, Its Mohs hardness is 9.36, melting point 24500c, ... density 2.51g/cm3. It has following unique features: neutron absorbing,of ... :+86 371 63691217Fax:+86 371 63691212 High Hardness Boron Carbide