A machinable ceramic, Boron Nitride (BN) can be machined into complex parts. After machining, the parts are ready to use without additional heat treatment or firing operations. BN solid parts are mainly used to variously of super-high temperature of vacuum furnace, metal or glass melting crucible and nozzles. Boron Nitride is most commonly produced as a hot pressed solid which orients during pressing, yielding a hexagonal and platy crystal structure. The resulting material properties are anisotropic, relative to the pressing direction. In fact, the material properties can vary significantly, relative to the direction of pressing and the grade of material.