Hot pressed Boron Nitride is manufactured by hot pressing. Its crystal structure is hexagonal. Due to the uniaxial densification method, the anisotropy of its platelet structure is created. As a result of the anisotropy, different physical properties occur, parallel or perpendicular to the pressing direction. It is a non-toxic material and can be easily machined.



Density ρ

1.9 - 1.95 g/cm³ at 20 °C


Compressive strength Rmc

30 MPa at 20 °C

Compressive strength, transverse Rs,trans

48 MPa at 20 °C

Elastic modulus E

34.1 GPa at 20 °C

Elastic modulus, transverse E

75.2 GPa at 20 °C

Flexural strength σbend

43.7 MPa at 20 °C

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Flexural strength, transverse σbendT

60.2 MPa at 20 °C

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Hardness, Vickers HV

12 [-] at 20 °C


Coefficient of thermal expansion α

6.7E-7 1/K at 700 °C

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Coefficient of thermal expansion, transverse αtrans

8.7E-7 1/K at 1500 °C

Max service temperature Tmax

850 °C

Max service temperature, inert Tmax,inert

1150 °C

Thermal conductivity λ

27.22 W/(m·K) at 20 °C

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Thermal conductivity, transverse λtrans

30.98 W/(m·K) at 20 °C

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Dielectric strength EDS

39.4 kV/mm at 20 °C

Electrical resistivity ρel

1.70E+12 Ω·m at 20 °C

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Electrical resistivity, transverse ρel,trans

4.00E+12 Ω·m at 20 °C

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Chemical properties


Weight %



49 - 52.9 %


40 - 42.6 %


3 - 5 %


0.5 - 3 %


0.4 %

Boric Oxides


Technological properties

Application areas

Electrical insulators for high power transistors and thyristors; Electrical insulators and vacuum feedthroughs in high temperature furnaces; Thermocouple protection tubes; Crucibles and rollers for molten glass and metals; Rolls and support elements in the glass manufacturing industries


The key features are: Excellent thermal behaviour; High electrical resistivity; Chemically Stable; Extraordinary thermocycling properties; High temperature material

Processing history

Hot pressing

This material data has been provided by Goodfellow.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.