.........The Fusion of Art and Science tm .........
G. Finkenbeiner Inc. 33 Rumford Ave Waltham, MA 02453. Telephone: (800)552-6182, 781-899-3138. Fax 781-647-4044
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.
Typical electrical property values for clear fused quartz include:
Electrical Resistance: 0.7 x 109 ohm-cm at 350oC
Dielectric Loss Factor: Less than 0.0004 at 20oC, 1 MHz
Dielectric Constant: 3.75 at 20oC, 1 MHz
Specific Resistivity: l018 ohm/cm3 at 20oC
Dissipation Factor: Less than 0.0001 at 20oC. 1 MHz
Dielectric Breakdown (Voltage vs. Frequency) Chart
Volume Conductivity Chart
Dissipation Factor Chart
Dielectric Constant Chart