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Chemical formula BN, boron-nitogen-compound with hexagonal (graphite-like) or cubic (diamond-like) crystal lattice structure.

Hexagonal boron nitride

crystallizes like graphite in a layer lattice and is therefore often called "white graphite". Its very good thermal (high melting- or sublimation point and good thermal shock stability) and physical characteristics (good electrical insulator, good heat conductivity and good high temperature lubrication qualities) make it an interesting ceramic material. One of the most well-known characteristics of hexagonal boron nitride is the very bad wettability by metal melts (like Al, Mg, Zn, Pb and Cu), slags as well as salt melts. Boron nitride is stable at air to approx. 1000°C (1832°F), under reduced conditions or inert gases it can be used up to 1800°C (3272°F).

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SEM image (secondray electron image) of boron nitride particles (magnification 6000-times)

Refractory materials on boron nitride base are available in the form of powders, hot isostatic pressed shaped parts and as suspensions (boron-nitride-coatings) for coating by dipping, brushing or spraying.

Cubic boron nitride,

also called borazon, is a hard material of high microhardness used for grinding applications.

Properties of boron nitride
Formular	BN
Molecular mass	24.82 g/mol
Density (hexagonal)	2.27 g/cm³
Density (cubic)	3.48 g/cm³
Melting range	2700-3000°C
CAS-No.	10043-11-5
EINECS-No.	233-136-6

These recommendations are believed to be correct. However, no guarantee of their accuracy is given. Therefore, purchasers shall make their own tests to determine suitability for their use. These products are offered for industrial and related uses (e.g. research and development) only. However the user must take the necessary precautions appropriate for products containing chemicals. This description does not imply the absence of any patents, the responsibility whatsoever solely rests with the user.

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