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Dense Silicon Nitride (IEC 60672 Type C-935)

Dense silicon nitride is a grade of silicon nitride. The graph bars on the material properties cards below compare dense silicon 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: Mechanical

1000 °C 1830 °F

Maximum Thermal Shock

290 °C 550 °F

Specific Heat Capacity

800 J/kg-K 0.19 BTU/lb-°F

Thermal Conductivity

30 W/m-K 17 BTU/h-ft-°F

Thermal Expansion

2.5 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz


Dielectric Constant (Relative Permittivity) At 1 MHz


Dielectric Strength (Breakdown Potential)

18 kV/mm 0.7 V/mil

Electrical Dissipation At 1 Hz


Electrical Dissipation At 1 MHz


Electrical Resistivity Order of Magnitude

11 10x Ω-m

Other Material Properties


3.4 g/cm3 210 lb/ft3

Elastic (Young's, Tensile) Modulus

280 GPa 41 x 106 psi

Flexural Strength

340 MPa 50 x 103 psi

Common Calculations

Stiffness to Weight: Axial

46 points

Stiffness to Weight: Bending

65 points

Thermal Diffusivity

11 mm2/s

Followup Questions

Further Reading

Silicon Nitride and the Sialons, Vivien Mitchell, 1993

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

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