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Pressure Sintered (Hot Pressed) Silicon Carbide

Hot pressed silicon carbide is a grade of silicon carbide. It has the highest strength compared to the other variants of silicon carbide. The graph bars on the material properties cards below compare hot pressed silicon 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

2800 MPa 410 x 103 psi

Elastic (Young's, Tensile) Modulus

490 GPa 71 x 106 psi

Flexural Strength

600 MPa 87 x 103 psi

Fracture Toughness

4.6 MPa-m1/2 4.2 x 103 psi-in1/2

Knoop Hardness


Poisson's Ratio


Tensile Strength: Ultimate (UTS)

370 MPa 53 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

1500 °C 2730 °F

Maximum Thermal Shock

210 °C 400 °F

Specific Heat Capacity

690 J/kg-K 0.16 BTU/lb-°F

Thermal Conductivity

120 W/m-K 71 BTU/h-ft-°F

Thermal Expansion

4.4 µm/m-K

Other Material Properties


3.2 g/cm3 200 lb/ft3

Dielectric Strength (Breakdown Potential)

4.0 kV/mm 0.16 V/mil

Electrical Resistivity Order of Magnitude

3.0 10x Ω-m

Common Calculations

Stiffness to Weight: Axial

84 points

Stiffness to Weight: Bending

82 points

Strength to Weight: Axial

32 points

Strength to Weight: Bending

35 points

Thermal Diffusivity

55 mm2/s

Thermal Shock Resistance

12 points

Followup Questions

Further Reading

Properties of Silicon Carbide, Gary L. Harris (editor), 1995

Silicon Carbine Ceramics: Fundamental and Solid Reaction, Shigeyuki Somiya and Yoshizo Inomata (editors), 1991

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

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