Mullite

Mullite is an excellent material due to its high temperature stability, strength and creep resistance. It is similar to Cordierite, although it is not as good an  insulator and has a higher coefficient of thermal expansion. It is commonly used in heater exchange parts and electrical insulators.

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Property Charts & Safety Data Sheets
Property Charts Mullite
Master Ceramics Property Chart Full Color
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Safety Data Sheets Dense Mullite Ceramic
Materials Property Chart
  Silicates
  Property ASTM Method Units Mullite
General Crystal Size (Average) Thin Section Microns 7
Color -- -- Gray-Tan
Water Absorption C 20-97 % 0
Mechanical Density C 20-97 g/cc 3.00
Hardness Vickers 500gm GPa (kg/mm2) 10 (1000)
Hardness -- R45N 78
Fracture Toughness Notched Beam MPam1/2 3
Flexural Strength (MOR)
(3 point) @ RT
F417-87 MPa (psi x 103 206 (30)
Tensile Strength @ RT -- MPa (psi x 103) 138 (20)
Compressive Strength @ RT -- MPa (psi x 103) 1034 (150)
Elastic Modulus C848 GPa (psi x 106) 179 (26)
Poisson's Ratio C848 -- 0.24
Thermal C.T.E. 25 - 100° C C 372-96 x 10-6/C 3.6
C.T.E. 25 - 300° C C 372-96 x 10-6/C 4.1
C.T.E. 25 - 600° C C 372-96 x 10-6/C 4.8
Thermal Conductivity @ RT C 408 W/m K 4
Max Use Temp -- Farenheit (°F) 3100
-- Celsius (°C) 1700
Electrical Dielectric Strength (.125" Thick) D 149-97A V/mil 250
Dielectric Constant @ 1 MHz D 150-98 -- 6.7
Dielectric Constant D 2520-95 -- 6.7
@ Gigahertz D 2520-95 -- 11.4
Dielectric Loss @ 1 MHz D 150-98 -- 0.003
Dielectric Loss D 2520-95 -- 0.003
@ Gigahertz D 2520-95 -- 11.4
Volume Resistivity, 25°C D 257 ohms-cm > 1 x 1014
Volume Resistivity, 300°C D 1829 ohms-cm 4 x 1010
Volume Resistivity, 500°C D 1829 ohms-cm 1 x 109
Note: The information in this data sheet is for design guidance only. STC does not warrant this data as absolute values. Forming methods and specific geometry could affect properties. Slight adjustments can be made to some of the properties to accommodate specific customer requirements. Most of the dense materials in the table are resistant to mechanical erosion and chemical attack. STC has performed ASTM testing qualification for certain compositions, in accordance with ASTM D2442. Please consult our technical staff for appropriate material and specific test results.