| Mullite Mullite is a good, low cost refractory material with a nominal composition of 3Al2O3•2SiO2. The raw materials are easily obtainable and are reasonably priced. It has excellent high temperature properties with improved thermal shock and thermal stress owing to the low thermal expansion, good strength and interlocking grain structure. | .Key Properties |  | Good thermal shock and stress resistance | | Low thermal conductivity | | Good strength | | Wear resistant | | Usable to high temperatures | .
Typical Uses | | Protection tubes | | Furnace liners | | Electrical insulators | Back to top 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 material 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
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