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HBN0921 Boron Nitride (BN) Ring

Boron Nitride Ring Properties

Hot Pressed Boron Nitride Ring

Compound Formula BN
Molecular Weight 24.82
Appearance White
Melting Point 2973 °C
Density 2.1 g/cm3 (h-BN); 3.45 g/cm3 (c-BN)
Solubility in H2O Insoluble
Refractive Index 1.8 (h-BN); 2.1 (c-BN)
Electrical Resistivity 13 to 15 10x Ω-m


Download Boron Nitride Ring SDS 


Boron Nitride Ring Description

Boron nitride, also known as BN, Hexagonal boron nitride (H-BN) and hot pressed boron nitride, is a good self-lubricate ceramic that can withstand high temperature and maintain its lubricating capability in high vacuum environment. Our Boron Nitride crucibles are made from hot pressed boron nitride blank. Hexagonal boron nitride (H-BN) behaves similar with graphite mechanically, but offers excellent electrical resistance.

Boron Nitride Ring Advantages

– Low wetability 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 (>3000C has been recorded).

Boron Nitride Ring Applications

Boron Nitride ceramics from Advanced Ceramic Materials can withstand high temperature in high vacuum environment, plus it has excellent corrosion resistance and electrical resistance. Thus, Boron Nitride ceramic product is an ideal choice in a wide range of industries, such as:
– Used in nozzles for nonferrous metals metallurgy industry
– Used in insulators for high temperature furnace
– Used as break rings for horizontal casting machine
– Used to feed through for high voltage equipment
– Used in Boron Nitride parts for ion injection equipment

Boron Nitride Ring Available Materials

Material Description Availability

Hot pressed at high temperature (1900C).

Excellent corrosion resistance and thermal conductivity. Limited wear resistance

Self-bonded and high purity (>99%)

Machinable Blanks

Finished Parts


General purpose material

Bonded by boric oxide

Finished Parts

Calcium borate bonded boron nitride

Enhanced moisture resitance

Finished Parts
BN60 BN 60%, SiO2 40% Finished Parts
BN40 BN 40%, SiO2 60% Finished Parts
ZSBN BN 45%, Zr2O3 45% Finished Parts

 Specifications of BN99 and ZSBN for your reference!

Packing Service

ACM’s Hot Pressed Boron Nitride Ring is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.



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Boron Nitride (BN) Ring
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by Thomas P. McNamara on Boron Nitride (BN) Ring

I'm so pleased with the product and the speedily delivery! Great doing business with, I highly recommend!