Boron Nitride rings have been widely used in horizontal continuous casting molten steel separation rings. Hot-pressed boron nitride is a good self-lubricating ceramic 

that can withstand high temperatures and maintain lubrication capabilities in high vacuum environments. Hexagonal boron nitride has mechanical properties similar to graphite but has excellent electrical resistance.

Edgetech Industries boron nitride ceramics can withstand high temperatures in high vacuum environments and provide excellent corrosion resistance and electrical resistance. Therefore, boron nitride ceramic products are ideal for a variety of industries.

Boron Nitride Ring Basic Information & Materials


BNH99, BN99, BN-ZS, BN-AlN



Melting Point

2700 °C


White/White Graphite/Greyish Green

Density, g/cm3

1.6~2.9 g/cm3

Solubility in H2O


Electrical Resistivity, Ω·m


Boron Nitride Materials




Hot pressed at high temperature (1900℃).
Excellent corrosion resistance and thermal conductivity, Limited wear resistance
Self-bonded and high purity (>99%)


General-purpose material
Bonded by boric oxide


Calcium borate bonded boron nitride
Enhanced moisture resistance


BN 60%, SiO2 40%


BN 40%, SiO2 60%


BN-45%, Zr2O3 45%



Boron Nitride Ring Advantages & Applications:

Boron Nitride ceramic from Edgetech Industries Ceramics Division can withstand high temperatures in a high vacuum environment, plus it has excellent corrosion resistance and electrical resistance.

-Low wettability to molten metal

-Relatively high thermal conductivity with low thermal expansion

-Relatively high thermal shock resistance

-Extremely high working temperature with proper inert gas protection

Boron nitride ceramic rings for casting are specialized components used in metal casting processes. These rings are typically made from boron nitride (BN), and they offer several advantages in the foundry industry.

Boron nitride ceramic rings are often used as release agents during metal casting processes. Their unique non-wetting properties make them ideal for this purpose. When placed between the mold and molten metal, BN rings prevent the metal from sticking to the mold, ensuring a smooth, clean cast. This property is especially important for complex or intricate casting shapes.

Although BN is not as thermally conductive as materials such as graphite, it still has good thermal conductivity. This property helps distribute heat evenly within the mold, promoting uniform cooling and solidification of the cast metal, which is essential for achieving precise and defect-free castings.


As a ceramic material, boron nitride is quite fragile in a lot of cases. Our Hot-Pressed Boron Nitride Ring is carefully handled to minimize damage during storage and transportation. Suitable outer boxes and inner cushioning materials are used for BN products, vacuum packing is also engaged for some of the parts.