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Electrical Properties of Fused Quartz

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. Both electrical insulation and microwave transmission properties are retained at very high temperatures and over a wide range of frequencies.

Typical Electrical Property Values for Clear Fused Quartz 



Electrical Resistance 

0.7 x 10Ω-cm at 350 °C

Dielectric Loss Factor

Less than 0.0004 at 20 °C and 1 MHz

Dielectric Constant 

3.75 at 20 °C and 1 MHz

Specific Resistivity 

1018 Ω/cm3 at 20 °C

Dissipation Factor 

Less than 0.0001 at 20 °C and 1 MHz





Typical properties are average data and should not be used as or to develop product specifications. 

For more information regarding the typical electrical properties of fused quartz, click here.

For more information regarding the use guidelines for fused quartz, click here.