Hexagonal boron nitride has good electrical insulation, thermal conductivity, chemical stability, and no significant melting point. In 0.1MPA nitrogen in the highest temperature up to 3000 ℃, in the neutral reduction atmosphere, heat-resistant to 2000 ℃, in nitrogen and argon in the use of temperature can reach 2800 ℃, in the oxygen atmosphere is less stable, the use of the temperature below 1000 ℃. The expansion coefficient of hexagonal boron nitride is equivalent to quartz, but the thermal conductivity is ten times that of quartz. Therefore, BN ceramic products are ideal for many industries, such as:

• Fracture rings for continuous casting of metals
• Heat Treatment Fixture
• Molten metal and glass castings
• Nozzles for transfer or atomization
• laser nozzle
• Induction heating coil holder
• High temperature and high voltage insulators
• Furnace supports requiring resistivity
• Crucibles and containers for high-purity molten metals
• Radar components and antenna windows
• Ion thruster discharge channel

Hexagonal boron nitride is insoluble in cold water and hydrolyzes very slowly when boiled and produces small amounts of boric acid and ammonia. It does not react with weak acids and strong bases at room temperature, is slightly soluble in hot acids, and needs to be treated with molten sodium hydroxide and potassium hydroxide to decompose.

• High heat resistance: 3000 ℃ sublimation, its strength 1800 ℃ for the room temperature of two times, 1500 ℃ air cooling to room temperature dozens of times without rupture, in inert gas 2800 ℃ does not soften.
• High thermal conductivity: hot pressing products for 33W/M.K and pure iron, in 530 ℃ above the ceramic material is the largest thermal conductivity material.
• Low Coefficient of Thermal Expansion: The coefficient of expansion is second only to quartz glass and is the smallest among ceramics, plus it has a high thermal conductivity, so it has good thermal shock resistance.
• Excellent electrical properties: high-temperature insulation is good, the resistivity at room temperature is greater than 10^14Ω-cm, at 2000 ℃ can also reach 10^3Ω-cm, is the best high-temperature insulation material in ceramics.
• Good corrosion resistance: no reaction with general metals (iron, copper, aluminum, lead, etc.), rare earth metals, precious metals, semiconductor materials (germanium, silicon, potassium arsenide), glass, molten salts (cristobalite, fluoride, slag), inorganic acids and alkalis.
• Lower coefficient of friction: U is 0.16, does not increase at high temperatures, higher temperature resistance than molybdenum disulphide, graphite, oxidizing atmosphere can be used up to 850 ℃, vacuum can be used up to 1800 ℃.
• High purity: its impurity content is less than 10PPM, while the boron content is more than 43.6%.
• Machinability: low hardness, can be machined into high precision parts and components by general machining methods.

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