Hexagonal Boron Nitride has a microstructure similar to that of Graphite. In both materials, this structure, made up of layers of tiny platelets, is responsible for excellent machinability and low-friction properties. we called hexagonal boron nitride (HBN) or white graphite. Boron Nitride is very often machined to isolate components that work in PVD equipment. They are being installed as replacement parts in PVD Magnetron sputtering systems.