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Elmet Technologies

Steatite (Magnesium Silicon Oxide)
Categories: Ceramic; Oxide; Magnesium Oxide; Silicon Oxide

Material Notes: Magnesium silicon oxide. Used for high frequency, low loss, high voltage insulation (resistor forms, surge arrestors, standoffs, spacers, and coil forms). Less expensive than alumina insulators.

Information below is typical for commercially available steatite. A wide variation of properties is possible between specific grades.

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Physical PropertiesMetricEnglishComments
Density 2.50 g/cc0.0903 lb/in³
Water Absorption 0.010 %0.010 %
 
Mechanical PropertiesMetricEnglishComments
Hardness, Mohs 7.57.5
Tensile Strength, Ultimate 65.0 MPa9430 psi
Modulus of Elasticity 100 GPa14500 ksi
Flexural Strength 125 MPa18100 psi
Compressive Strength 500 MPa72500 psi
Poissons Ratio 0.240.24
Shear Modulus 45.0 GPa6530 ksi
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 1.00e+11 ohm-cm1.00e+11 ohm-cm
Dielectric Constant 5.95.9
Dielectric Strength 9.00 kV/mm229 kV/inWide Variation Between Grades
 
Thermal PropertiesMetricEnglishComments
CTE, linear  8.00 µm/m-°C
@Temperature 20.0 - 700 °C
4.44 µin/in-°F
@Temperature 68.0 - 1290 °F
 8.50 µm/m-°C
@Temperature 20.0 - 1000 °C
4.72 µin/in-°F
@Temperature 68.0 - 1830 °F
Specific Heat Capacity 1.00 J/g-°C0.239 BTU/lb-°F
Thermal Conductivity 3.00 W/m-K20.8 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air 1000 °C1830 °F
 
Descriptive Properties
ColorOff-White

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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