Steatite Ceramic – Magnesium Silicate

Alumina Ceramic – 96% Dense Aluminum Oxide

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 for steatite ceramics include, but not limited to; bushings, 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 GradeL-3L-5
Physical Properties
Water Absorption (%)Impervious: 0.00 – 0.02Impervious: 0.00 – 0.02
Density (g/cc)2.52.7
ColorOff White (Cream)Off White (Cream)
Mechanical Properties
Flexural Strength (1K PSI)1820
Compressive Strength (1K PSI)8090
Tensile Strength (1K PSI)8.59
Hardness (Moh’s Scale)7.57.5
Impact Resistance (Inch-Lbs.)55.3
Electrical Properties
Dielectric Strength (Volts/Mil)230240
Dielectric Constant (@1MHz)5.56.2
Volume Resistivity 25 C (ohms-cm)>1E14>1E14
Loss Index (@1MHz)0.0280.007
Thermal Properties  
C.O.T.E. (20-650 C)8.0 x 10-68.4 x 10-6
Safe Operating Temperature (C)10001000
Thermal Conductivity (W/m-C)3.43.4
Note: This information is for design guidance only.  Du-Co will not guarantee this information as absolute values.  Various geometries can affect properties