Dense Zircon-Based Porcelain (IEC 60672 Type C-440)
C-440 zircon-based porcelain is a grade of engineering porcelain. The graph bars on the material properties cards below compare C-440 zircon-based 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
150 GPa 21 x 106 psi
Flexural Strength
110 MPa 17 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
10
Dielectric Constant (Relative Permittivity) At 1 MHz
6.5
Dielectric Strength (Breakdown Potential)
17 kV/mm 0.66 V/mil
Electrical Dissipation At 1 Hz
0.0044
Electrical Dissipation At 1 MHz
0.0043
Electrical Resistivity Order of Magnitude
11 10x Ω-m
Other Material Properties
Density
2.8 g/cm3 170 lb/ft3
Maximum Temperature: Mechanical
1170 °C 2130 °F
Maximum Thermal Shock
170 °C 340 °F
Specific Heat Capacity
600 J/kg-K 0.14 BTU/lb-°F
Thermal Conductivity
6.5 W/m-K 3.8 BTU/h-ft-°F
Thermal Expansion
6.0 µm/m-K
Common Calculations
Stiffness to Weight: Axial
29 points
Stiffness to Weight: Bending
63 points
Strength to Weight: Axial
13 points
Strength to Weight: Bending
20 points
Thermal Diffusivity
3.9 mm2/s
Thermal Shock Resistance
11 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