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Since electrical conductivity in fused quartz is ionic in nature, and alkali ions exist only as trace constituents, fused quartz is the preferred glass for electrical insulation and low loss dielectric properties.
In general, the electrical insulating properties of clear fused quartz are superior to those of the opaque or translucent types. Both electrical insulation and microwave transmission properties are retained at very high temperatures and over a wide range of frequencies.
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Typical electrical property values for clear fused quartz include:
 Electrical Resistance: 0.7 x 109 ohm cm at 350°C
Dielectric Loss Factor: Less than 0.0004 at 20°C, 1 MHz
Dielectric Constant: 3.75 at 20°C, 1 MHz
Specific Resistivity: 1018 ohm/cm3 at 20°C
Dissipation Factor: Less than 0.0001 at 20°C, 1 MHz
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Momentive Performance Materials
