China boron carbide (bc) catalog of high hardness boron carbide powder (b4c) for nuetron shielding absorbing, high purity boron carbide powder (b4c) for making wear-resisting parts provided by china manufacturerkumthai abrasives co., ltd., page1. Boron carbide, black powder, is the hardest of the conventional abrasives. its mohs hardness is 9.36, melting point 2350u00bac, density 2.51g/cm3. it has following unique features: neutron absorbing, of semi-conductivity, low thermal conductivity, high grinding efficiency and no reaction with either acids or alkali etc. Buy any quantity nano boron carbide b4c powder from boron carbide powder suppliers in india. all india metal corporation is an iso certified stockist and supplier of high purity boron carbide powder with a wide product range, reliable traders, exporters and effective sourcing. 35 years of experience of manufacturing boron carbide b4c powder Jan 14, 2020u00a0u00b7 boron carbide is mainly made as a controlled rod in a nuclear reactor field, but sometimes it is made into the powder to increase the surface area. at chernobyl nuclear accident in 1986, russia eventually stopped the chain reaction in the reactor after dropping nearly 2,000 tons of boron carbide and sand.