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 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 | ||