Find many great new & used options and get the best deals for 35x20x6mm b4c boron carbide air sandblaster nozzle sandblasting tool tip ab e8w4 at the best online prices at ebay! Jun 12, 2018 · boron carbide (chemical formula approximately b4c) is an extremely hard boron-carbon 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 gpa, it is one of the hardest known materials, behind cubic boron nitride and diamond. May 09, 2018 · the tungsten carbide balls with sizes ranging from ￠1mm to ￠70mm,are produced according to the national standard gb308-2002,the ones reach precision degree at g5-g100 with good roundness, high precision, long service life, which are mainly taken for precision gauge vales,hydraulic fittings, hardness testers etc.meanwhile, the common grades to make the carbide Jul 11, 2019 · boron carbide market research report is a professional and in-depth study on the current state which focuses on the major drivers and restraints for the key players. boron carbide industry research report provides granular analysis of the market share, segmentation, revenue forecasts and geographic regions of the market.