Pressed Siliceous Porcelain (IEC 60672 Type C-111)
C-111 siliceous porcelain is a grade of engineering porcelain. The graph bars on the material properties cards below compare C-111 siliceous 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
43 MPa 6.2 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
Thermal Properties
Maximum Temperature: Mechanical
1170 °C 2130 °F
Maximum Thermal Shock
170 °C 340 °F
Specific Heat Capacity
850 J/kg-K 0.2 BTU/lb-°F
Thermal Conductivity
1.8 W/m-K 1.0 BTU/h-ft-°F
Thermal Expansion
4.5 µm/m-K
Other Material Properties
Density
2.3 g/cm3 150 lb/ft3
Dielectric Constant (Relative Permittivity) At 1 MHz
6.5
Dielectric Strength (Breakdown Potential)
25 kV/mm 1.0 V/mil
Electrical Dissipation At 1 MHz
0.0024
Electrical Resistivity Order of Magnitude
10 10x Ω-m
Common Calculations
Stiffness to Weight: Axial
21 points
Stiffness to Weight: Bending
63 points
Strength to Weight: Axial
15 points
Strength to Weight: Bending
24 points
Thermal Diffusivity
0.88 mm2/s
Thermal Shock Resistance
24 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