Steatite Ceramic – Magnesium Silicate

Steatite Ceramics are excellent electrical insulators.  Our Steatite products are low cost materials having good mechanical strength, great electrical insulating properties, good wear and corrosion resistance and can function at safe operating temperatures up to 1000 C.  Typical applications include, but are not limited to, electric heating elements, igniters, lamp bases/sockets, resistors, stand offs, band heaters, knife sharpeners, thermocouple cores, thermostat pins, load banks, ovens, furnaces, connectors, spacers, electrostatic air cleaners, relays, switches, fuses, substrates, sensors and stiffening rods.

Mechanical, Electrical, Thermal and Physical Properties

Material Grade L-3 L-5
Physical Properties
Water Absorption (%) Impervious: 0.00 – 0.02 Impervious: 0.00 – 0.02
Density (g/cc) 2.5 2.7
Color Off White (Cream) Off White (Cream)
Mechanical Properties
Flexural Strength (1K PSI) 18 20
Compressive Strength (1K PSI) 80 90
Tensile Strength (1K PSI) 8.5 9
Hardness (Moh’s Scale) 7.5 7.5
Impact Resistance (Inch-Lbs.) 5 5.3
Electrical Properties
Dielectric Strength (Volts/Mil) 230 240
Dielectric Constant (@1MHz) 5.5 6.2
Volume Resistivity 25 C (ohms-cm) >1E14 >1E14
Loss Index (@1MHz) 0.028 0.007
Thermal Properties    
C.O.T.E. (20-650 C) 8.0 x 10-6 8.4 x 10-6
Safe Operating Temperature (C) 1000 1000
Thermal Conductivity (W/m-C) 3.4 3.4
Note: This information is for design guidance only.  Du-Co will not guarantee this information as absolute values.  Various geometries can affect properties