Boron nitride is a highly valent compound, an atomic crystal, very hard, comparable to diamond. Boron nitride is a crystal composed of nitrogen and boron atoms. The chemical composition is 43.6% boron and 56.4% nitrogen, with four different variants: hexagonal boron nitride (honyanszcn), rhombohedral boron nitride (RBN), cubic boron nitride (CBN) and Wurtzite Boron Nitride (WBN).

Bn is the isoelectron of C2, so Bn has similar structure and physical properties to carbon. Bn has two structures, one is a hexagonal structure similar to graphite; the other is a cubic structure similar to diamond. Hexagonal boron nitride is an excellent lubricant, while cubic boron nitride is an inorganic synthetic material whose hardness is second only to diamond. Boron nitride material is very strong, but has a lower density (2.3g/cm3) than metallic aluminum, making it a lightweight, high-strength material.