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Pyrolytic Boron Carbide

Pyrolytic boron carbide is a grade of boron carbide. The graph bars on the material properties cards below compare pyrolytic boron carbide 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.

Mechanical Properties

Compressive (Crushing) Strength

2120 MPa 310 x 103 psi

Elastic (Young's, Tensile) Modulus

240 GPa 34 x 106 psi

Flexural Strength

170 MPa 25 x 103 psi

Fracture Toughness

3.5 MPa-m1/2 3.2 x 103 psi-in1/2

Knoop Hardness


Poisson's Ratio


Tensile Strength: Ultimate (UTS)

350 MPa 51 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

2500 °C 4530 °F

Melting Onset (Solidus)

2470 °C 4480 °F

Specific Heat Capacity

950 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

31 W/m-K 18 BTU/h-ft-°F

Thermal Expansion

5.3 µm/m-K

Other Material Properties


2.1 g/cm3 130 lb/ft3

Dielectric Constant (Relative Permittivity) At 1 MHz


Dielectric Strength (Breakdown Potential)

56 kV/mm 2.2 V/mil

Electrical Resistivity Order of Magnitude

11 10x Ω-m

Common Calculations

Stiffness to Weight: Axial

63 points

Stiffness to Weight: Bending

99 points

Strength to Weight: Axial

47 points

Strength to Weight: Bending

53 points

Thermal Diffusivity

16 mm2/s

Thermal Shock Resistance

20 points

Followup Questions

Further Reading

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

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