Steatite (Magnesium Silicon Oxide)

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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 Properties	Original Value	Comments

Density	2.50 g/cc
Water Absorption	0.010 %

Mechanical Properties	Original Value	Comments
Hardness, Mohs	7.5
Tensile Strength, Ultimate	65.0 MPa
Modulus of Elasticity	100 GPa
Flexural Strength	125 MPa
Compressive Strength	500 MPa
Poissons Ratio	0.24
Shear Modulus	45.0 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	1.00e+11 ohm-cm
Dielectric Constant	5.9
Dielectric Strength	9.00 kV/mm	Wide Variation Between Grades

Thermal Properties	Original Value	Comments
CTE, linear	8.00 µm/m-°C @Temperature 20.0 - 700 °C
	8.50 µm/m-°C @Temperature 20.0 - 1000 °C
Specific Heat Capacity	1.00 J/g-°C
Thermal Conductivity	3.00 W/m-K
Maximum Service Temperature, Air	1000 °C

Descriptive Properties
Color	Off-White

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BSTEAT / 290

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