CAS: 12069-32-8 EINECS: 235-111-5 Formula: CB4 molecular weight: 55.25 color: Black powder Boron Carbide is one of the hardest materials known, ranking second behind diamond. Boron carbide is characterized as following,Extreme hardness,hardness 9.36.Difficult to sinter to high relative density without the use of sintering aids.Good chemical resistance.Good nuclear properties.High temperature,low ...