Hexagonal Boron Nitride (BN)

Hexagonal boron nitride is a non-oxide engineering ceramic material.

It has four common variants, each represented as a separate material. The Material Properties section below shows ranges encompassing all variants. For more specific values, follow the links in the Variant Materials section.

Material Properties

Compressive (Crushing) Strength21 to 250 MPa (3.0 to 36 x 103 psi)

Density1.9 to 2.1 g/cm3 (120 to 130 lb/ft3)

Dielectric Constant (Relative Permittivity) At 1 MHz4.0 to 4.4

Dielectric Strength (Breakdown Potential)61 to 200 kV/mm (2.4 to 7.8 V/mil)

Elastic (Young's, Tensile) Modulus14 to 60 GPa (2.0 to 8.7 x 106 psi)

Electrical Dissipation At 1 Hz0.0017

Electrical Dissipation At 1 MHz0.00075 to 0.0011

Electrical Resistivity Order of Magnitude13 to 15 10x Ω-m

Flexural Strength18 to 140 MPa (2.6 to 20 x 103 psi)

Poisson's Ratio0.11

Specific Heat Capacity840 to 1610 J/kg-K

Thermal Conductivity29 to 96 W/m-K

Thermal Diffusivity16 to 18 m2/s

Thermal Expansion0.54 to 18 µm/m-K

The length of each bar compares the given value to the highest value in the database.

Further Reading

Handbook of Refractory Carbides and Nitrides: Properties, Characteristics, Processing and Applications, Hugh O. Pierson, 1996

IEC 60672-3: Ceramic and glass-insulating materials - Part 3: Specifications for individual materials