Mullite Ceramic Properties
Mullite is a good, low cost refractory ceramic with a nominal
composition of 3Al2O3•2SiO2.
The raw materials for mullite are easily obtainable and are reasonably
priced. It has excellent high temperature properties with improved
thermal shock and thermal stress resistance owing to the low thermal
expansion, good strength and interlocking grain structure.
.Key
Mullite Properties |  |
Good thermal shock and stress resistance | |
Low thermal conductivity | |
Good strength | |
Wear resistant | |
Usable to high temperatures |
Typical Mullite Uses | |
Protection tubes | |
Furnace liners | |
Electrical insulators |
Download Mullite datasheet
Mullite Engineering Properties* |
Mullite — Cast and Extruded | |
Mechanical |
Units of Measure |
SI/Metric |
(Imperial) | |
Density |
gm/cc (lb/ft3) |
2.8 |
(175) | |
Porosity |
% (%) |
0 |
0 | |
Color |
— |
off-white |
off-white | |
Flexural Strength |
MPa (lb/in2x103) |
180 |
(26) | |
Elastic Modulus |
GPa (lb/in2x106) |
151 |
(22) | |
Shear Modulus |
GPa (lb/in2x106) |
— |
— | |
Bulk Modulus |
GPa (lb/in2x106) |
— |
— | |
Poisson’s Ratio |
— |
— |
— | |
Compressive Strength |
MPa (lb/in2x103) |
1310 |
(190) | |
Hardness |
Kg/mm2 |
1070 |
— | |
Fracture Toughness KIC |
MPa•m1/2 |
2 |
— |
Maximum Use Temperature
(no load) |
°C (°F) |
1650 |
(3000) | |
Thermal | | | | |
Thermal Conductivity |
W/m•°K (BTU•in/ft2•hr•°F) |
6 |
(42) | |
Coefficient of Thermal Expansion |
10–6/°C (10–6/°F) |
5.4 |
(3) | |
Specific Heat |
J/Kg•°K (Btu/lb•°F) |
— |
— | |
Electrical | | | | |
Dielectric Strength |
ac-kv/mm (volts/mil) |
9.8 |
(245) | |
Dielectric Constant |
@ 1 MHz |
5.8 |
5.8 | |
Dissipation Factor |
@ 1 kHz |
0.003 |
0.003 | |
Loss Tangent |
— |
— |
— | |
Volume Resistivity |
ohm•cm |
>1013 |
>1013 |
*All properties are room temperature values except as noted.
The data presented is typical of commercially available mullite and is
offered for comparative purposes only. The information is not to be
interpreted as absolute material properties nor does it constitute a
representation or warranty for which we assume legal liability. User
shall determine suitability of the material for the intended use and
assumes all risk and liability whatsoever in connection therewith.
See also: Ceramic Rod & Tube
See also: Ceramic Rod & Tube > Mullite Sizes
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