due to the B12 structural device, the chemical formulation of "perfect" boron carbide is commonly penned not as B4C, but as B12C3, as well as carbon deficiency of boron carbide explained regarding a mix of the B12C3 https://blog.globalgoodsguru.com/exploring-the-superiority-of-silicon-carbide-tubes-in-industrial-applications-fe95cea9bf5d