Boron nitride has a typical crystal structure, but it has ceramic-like properties. Boron nitride is also a machinable ceramic with low dielectric constant, high thermal conductivity, extremely high resistivity and dielectric strength. The dielectric strength is higher than 500kV/cm at high frequency, and the value remains unchanged at high temperature. Its thermal conductivity and thermal shock resistance are also very good. These properties make it very suitable to be used as various electrically insulating elements that can conduct heat. Accurate tolerance and high surface finish can be obtained by finishing.

Boron nitride has extremely high corrosion resistance and is not corroded by molten metal, salt, acid and alkali. When the temperature reaches 700℃, it is still not oxidized. Its mechanical and chemical properties are still very stable when it reaches 1650℃ in vacuum. Boron nitride is easily affected by water (hydrolysis), and its resistivity decreases after water absorption. Therefore, boron nitride should be stored in a dry place after cleaning or vacuum roasting.