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PBN Tube, Pyrolytic Boron Nitride Tube

PBN Tube, Pyrolytic Boron Nitride Tube

Pyrolytic Boron Nitride (PBN) Tube is a high-performance ceramic tube that is commonly used in high-temperature and high-vacuum applications. It is made from boron nitride powder by a chemical vapor deposition process that results in a dense, uniform, and isotropic structure.

PBN tubes are known for their excellent thermal stability, high thermal conductivity, and low thermal expansion coefficient. They can withstand temperatures up to 1800°C in an inert atmosphere and up to 1400°C in air. They are also highly resistant to chemical corrosion and do not react with most molten metals, making them an ideal choice for semiconductor and high-tech industry applications.

PBN tubes are available in various sizes and shapes, including round, rectangular, and custom shapes. They are often used as insulation tubes, heater tubes, and protective tubes in high-temperature furnaces, as well as in semiconductor manufacturing equipment, aerospace and defense, and medical devices.

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


PBN Tube Properties

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

PBN Tube Applications

Boron Nitride ceramic from CG Material can withstand high temperature in a 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:
– Crucibles for crystal growth
– Break rings for horizontal casting machine
– Insulators for high-temperature furnace
– Electric insulators in vacuum system
– Feed through for high voltage equipment


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


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