50-65% Al2O3 Mullite (IEC 60672 Type C-610)
C-610 mullite is a grade of mullite. The graph bars on the material properties cards below compare C-610 mullite 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
800 MPa 120 x 103 psi
Elastic (Young's, Tensile) Modulus
110 GPa 16 x 106 psi
Flexural Strength
130 MPa 18 x 103 psi
Fracture Toughness
2.0 MPa-m1/2 1.8 x 103 psi-in1/2
Knoop Hardness
750
Poisson's Ratio
0.25
Tensile Strength: Ultimate (UTS)
160 MPa 24 x 103 psi
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 Hz
8.0
Dielectric Constant (Relative Permittivity) At 1 MHz
6.3
Dielectric Strength (Breakdown Potential)
16 kV/mm 0.63 V/mil
Electrical Dissipation At 1 MHz
0.0025
Electrical Resistivity Order of Magnitude
10 10x Ω-m
Other Material Properties
Density
2.7 g/cm3 170 lb/ft3
Maximum Temperature: Mechanical
1680 °C 3060 °F
Maximum Thermal Shock
230 °C 450 °F
Specific Heat Capacity
950 J/kg-K 0.23 BTU/lb-°F
Thermal Conductivity
3.5 W/m-K 2.0 BTU/h-ft-°F
Thermal Expansion
5.8 µm/m-K
Common Calculations
Stiffness to Weight: Axial
22 points
Stiffness to Weight: Bending
58 points
Strength to Weight: Axial
17 points
Strength to Weight: Bending
24 points
Thermal Diffusivity
1.4 mm2/s
Thermal Shock Resistance
19 points
Followup Questions
Further Reading
Mullite, Hartmut Schneider and Sridhar Komarneni (editors), 2005
Ceramic and Glass Materials: Structure, Properties and Processing, James F. Shackelford and Robert H. Doremus (editors), 2008
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