Boron Nitride Tube

Boron Nitride Tube offers a rare combination of high thermal conductivity, electrical insulation, and resistance to oxidation, leveraging the robust covalent-ionic bonding of boron and nitrogen atoms in its hexagonal form. With stability in air above 900 °C and chemical inertness to most molten metals and reactive environments, it is ideally suited for extreme-condition applications. Industries such as aerospace, semiconductor manufacturing, and high-temperature processing benefit from its unique thermal and dielectric performance. Common uses include insulating sleeves in high-voltage furnaces, containment liners for reactive melts, and protective enclosures for high-power electronic components. Advances in research, particularly with boron nitride nanotube-reinforced structures, are extending its use to energy harvesting, biomedical devices, and advanced nanocomposites. Its multifunctionality ensures continued relevance in both cutting-edge scientific research and industrial systems demanding reliability under extreme thermal and chemical stress.

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Tolerance

Properties

Reference & Citations

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Tolerances

Tube

Outside Diameter	=<2mm	±10%
Outside Diameter	=<5mm	±10%
Outside Diameter	>5mm	±10%
Wall Thickness		±20%

Material Properties for Ceramics

Chemical Resistance

Element	Value
Acids - concentrated	Fair
Acids - dilute	Fair
Alkalis	Fair
Halogens	Poor
Metals	Good

Electrical Properties

Element	Value
Dielectric constant	4.3
Dielectric strength( kV mm⁻¹ )	40-200
Volume resistivity( Ohmcm )	10¹¹-10¹⁴@25

Physical Properties

Element	Value
Apparent porosity( % )	Feb-15
Density( gcm⁻³ )	1.9-2.2

Thermal Properties

Element	Value
Sublimation point( C )	2600-2800
Upper continuous use temperature( C )	950-2500
Specific heat( J K⁻¹ kg⁻¹ )	800-2000@25°C
Thermal conductivity( W m⁻¹ K⁻¹ )	15-50@20°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	1-36@20-1000°C