Skip to product information
1 of 4


Boron Nitride Tube, BN Tube

Boron Nitride Tube, BN Tube

Boron Nitride Tube, also known as BN Tube, is a high-performance ceramic tube made from boron nitride (BN) powder. It is a white, highly crystalline material with a hexagonal lattice structure that gives it exceptional thermal and mechanical properties.

BN Tubes are produced using a hot-pressing process that involves applying heat and pressure to BN powder, resulting in a highly dense, uniform material with excellent strength and thermal conductivity.

BN Tubes are highly valued for their unique combination of properties, which include high thermal conductivity, excellent electrical insulation, low coefficient of friction, and resistance to thermal shock. These properties make BN Tubes ideal for use in high-temperature applications, such as furnace tubes, thermocouple protection tubes, and heating elements.

BN Tubes are also highly resistant to chemical attack and can withstand harsh chemical environments, making them an ideal material for use in chemical processing and semiconductor manufacturing.

BN Tubes are available in various sizes and lengths, ranging from thin-walled to thick-walled tubes, and can be customized to meet specific application requirements. They are also available in a range of shapes, including round, square, and custom shapes.

Boron Nitride Ceramics Specification

CG Material production formulations are developed to address the varied application problems in which ceramic components are commonly used. Many industrial applications push the envelope on specific requirements leading to the development of new formulations to successfully address them.

Item No. Description Purity Lot Size
CG-NI05-98 Boron Nitride Powder
Particle Size: 3 µm, 200 mesh or 325mesh
BN > 98 %,
B2O3 < 0.6%,
Ca < 0.015%,
Si < 0.12%
100 kg
CG-NI05-99 Boron Nitride Powder
Particle Size: 3 µm, 200 mesh or 325mesh
BN > 99 %,
B2O3 < 0.4%,
Ca < 0.01%,
Si < 0.10%
100 kg

Comparison of Boron Nitride Ceramics

Compositions BN>98% BN+SiC+ZrO2 BN+AIN
Binder B2O3 / AlBO3
Density 2.1-2.2 g/cm3 2.3-3.0 g/cm3 2.5-2.6 g/cm3
25°C Volume Resistivity >1013 Ω·cm >1012 Ω·cm >1014 Ω·cm
Max. Service Temp. (°C)
Inert Gas;
High Vacuum










Flexural Strength 75 Mpa 100 Mpa 130 Mpa
Compressive Strength 100 Mpa 300 Mpa 250 Mpa
Coefficient of Thermal Expansion
2.0 x 10–6/K 4.0 x 10–6/K 4.5 x 10–6/K
Thermal Conductivity 30 W/mK 40 W/mK 60 W/mK


Boron Nitride Tube Available Materials

Material Description Availability
BN99 Hot pressed at high temperature (1900℃).
Excellent corrosion resistance and thermal conductivity. Limited wear resistance
Self-bonded and high purity(>99%)
Machinable Blanks
Finished Parts
BNBO General purpose material
Bonded by boric oxide
Finished Parts
BNCB Calcium borate bonded boron nitride
Enhanced moisture resistance
Finished Parts
BN60 BN 60%, SiO2 40% Finished Parts
BN40 BN 40%, SiO2 60% Finished Parts
ZSBN BN-45%, Zr2O3 45% Finished Parts

Boron Nitride Tube Advantages

– Low wettability to molten metal
– Low dielectric constant
– Relatively high dielectric strength
– 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).
– Chemical Vapor Deposition (CVD)

Boron Nitride Tube Applications

Boron Nitride ceramic from CG Material can withstand high temperature in the high vacuum environment, plus it is chemically inert — 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:

-Electric insulators in vacuum system
-Boron Nitride ceramic components for PVD, MOCVD, MBE system.
-Nozzles for nonferrous metals metallurgy industry
-Spacers for glass melting
-Insulators for high-temperature furnace


We handle our products with care to ensure they remain in their original condition during storage and transportation and to preserve their quality.


View full details

Contact form