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
600
Poisson's Ratio
0.17
Rockwell R Hardness
60
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
7.0
Dielectric Constant (Relative Permittivity) At 1 MHz
6.5
Dielectric Strength (Breakdown Potential)
23 kV/mm 0.89 V/mil
Electrical Dissipation At 1 Hz
0.0096
Electrical Dissipation At 1 MHz
0.00043
Electrical Resistivity Order of Magnitude
12 10x Ω-m
Other Material Properties
Density
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