Boron Carbide Bulletproof Plate | Stanford Advanced Materials
Boron Carbide Bulletproof Plate Description. Boron carbide, B4C, is an extremely hard ceramic material discovered in 1899. It is the third hardest material known, after diamond and cubic boron nitride. The Mohs hardness of this boron carbide ceramic is about 9.49 and it was applied widely in industries as wearing resistant material, abrasive.