Menu (ESC)

Dense Celsian Porcelain (IEC 60672 Type C-420)

C-420 celsian porcelain is a grade of engineering porcelain. The graph bars on the material properties cards below compare C-420 celsian porcelain to other oxide-based 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

590 MPa 86 x 103 psi

Elastic (Young's, Tensile) Modulus

87 GPa 13 x 106 psi

Flexural Strength

91 MPa 13 x 103 psi

Fracture Toughness

2.0 MPa-m1/2 1.8 x 103 psi-in1/2

Knoop Hardness


Poisson's Ratio


Rockwell R Hardness


Shear Modulus

34 GPa 4.9 x 106 psi

Tensile Strength: Ultimate (UTS)

130 MPa 19 x 103 psi

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz


Dielectric Constant (Relative Permittivity) At 1 MHz


Dielectric Strength (Breakdown Potential)

23 kV/mm 0.89 V/mil

Electrical Dissipation At 1 Hz


Electrical Dissipation At 1 MHz


Electrical Resistivity Order of Magnitude

12 10x Ω-m

Other Material Properties


3.0 g/cm3 190 lb/ft3

Maximum Temperature: Mechanical

1170 °C 2130 °F

Maximum Thermal Shock

220 °C 440 °F

Specific Heat Capacity

900 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

2.0 W/m-K 1.2 BTU/h-ft-°F

Thermal Expansion

4.6 µm/m-K

Common Calculations

Stiffness to Weight: Axial

16 points

Stiffness to Weight: Bending

49 points

Strength to Weight: Axial

12 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

0.73 mm2/s

Thermal Shock Resistance

23 points

Followup Questions

Further Reading

ASTM C242: Standard Terminology of Ceramic Whitewares and Related Products

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015