Boron carbide powder b4c bulk & research qty manufacturer. properties, sds, applications, price. free samples program. ... ensure good ventilation at the workplace. ... recovery and reutilization of high-quality boron carbide from sapphire wafer grinding-waste. - material: boron carbidecolor: bright blackhardness: 9.36 we offer highly generous boron carbide powder paste in affordable price range. this is basically used for rough cutting the angle of the die to remove the rings on the carbide dies. in the manufacture we are trying to include B4c boron carbide powder for bulletproof armor plate boron carbide is smelted from boric acid and powdered carbon in electric furnace under high temperature. depending on hardness of 4950kgf/mm2, it is even harder than diamond and cubic boron nitride. Boron carbide (b4c) is one of the hardest materials known. it can be used for reaction bonded, hot-pressed, sintered parts, technical ceramics, body and vehicle armor, nuclear shielding, wear parts, abrasives, lapping, and refractory.