Boron carbide (chemical formula approximately b4c) is an extremely hard boronu2013carbon ceramic, and covalent material used in tank armor, bulletproof vests, engine sabotage powders, as well as numerous industrial applications. with a vickers hardness of >30 B4c (boron carbide) u2013 is a crystalline compound of boron and carbon. it is an extremely hard synthetically produced material. b4c ceramic ensures maximum durability with the lowest weight among other comparables. b4c delivers the highest level of ballistic protection available and offers protection from virtually all rifles and handguns. ... American elements specializes in producing high purity boron carbide powder with the smallest possible average grain sizes for use in preparation of pressed and bonded sputtering targets and in chemical vapor deposition (cvd) and physical vapor deposition (pvd) processes including thermal and electron beam (e-beam) evaporation, low temperature organic evaporation, atomic layer deposition (ald), metallic-organic and chemical vapor deposition u2026 Find many great new & used options and get the best deals for 35x20x6mm b4c boron carbide air sandblaster nozzle sandblasting tool tip ab n2z4 at the best online prices at ebay!