Quartz Glass

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Related to Quartz Glass: fused silica
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Quartz Glass


a single-component lime silicate glass produced by melting natural varieties of silica, such as rock crystal, vein quartz, and quartz sand, as well as synthetic silicon dioxide.

A distinction is made between two types of industrial quartz glass: transparent (optical and industrial) and opaque. Opacity is produced by a large number of small light-scattering gas bubbles (diameter, 0.03–0.3 microns) distributed throughout the glass. Optical transparent quartz glass, which is produced by fusion of rock crystal, is completely uniform and does not contain visible gas bubbles. Among the silicate glasses it has the lowest index of refraction (nD = 1.4584) and the greatest light transmission, particularly for ultraviolet rays.

Quartz glass is characterized by high thermal and chemical stability; its softening temperature is 1400°C. It is a good dielectric: specific electrical conductivity at 20°C, 10-14 to 10-16 ohm-1.m-1; tangent of the dielectric phase angle at 20°C and 106 hertz, 0.0025–0.0006. Quartz glass is used for manufacturing laboratory vessels, crucibles, optical instruments, insulators (particularly for high temperatures), and articles resistant to temperature fluctuations.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

quartz glass, silica glass

Glass consisting entirely of pure, or nearly pure, amorphous silica;
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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