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Pyrolytic Boron Nitride

Pyrolytic boron nitride is a grade of hexagonal boron nitride. The graph bars on the material properties cards below compare pyrolytic boron nitride to other non-oxide engineering ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Thermal Properties

Maximum Temperature: Corrosion

1140 °C 2080 °F

Maximum Temperature: Mechanical

2350 °C 4260 °F

Maximum Thermal Shock

1720 °C 3130 °F

Specific Heat Capacity

840 J/kg-K 0.2 BTU/lb-°F

Thermal Conductivity

42 W/m-K 24 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz


Dielectric Strength (Breakdown Potential)

200 kV/mm 7.8 V/mil

Electrical Dissipation At 1 Hz


Electrical Dissipation At 1 MHz


Electrical Resistivity Order of Magnitude

15 10x Ω-m

Other Material Properties

Compressive (Crushing) Strength

250 MPa 37 x 103 psi


2.1 g/cm3 130 lb/ft3

Elastic (Young's, Tensile) Modulus

23 GPa 3.3 x 106 psi

Flexural Strength

140 MPa 20 x 103 psi

Poisson's Ratio


Tensile Strength: Ultimate (UTS)

40 MPa 5.8 x 103 psi

Common Calculations

Stiffness to Weight: Axial

6.0 points

Stiffness to Weight: Bending

45 points

Strength to Weight: Axial

5.3 points

Strength to Weight: Bending

12 points

Thermal Diffusivity

24 mm2/s

Thermal Shock Resistance

7.1 points

Followup Questions

Further Reading

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

Ceramics and Composites: Processing Methods, Narottam P. Bansal and Aldo R. Boccaccini (editors), 2012

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

Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005

Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010