Fused quartz, silica glass, and quartz glass are synonyms for glass made from high purity quartz. Quartz Glass is manufactured by melting naturally occurring high purity quartz sand at approximately 2000 °C, using either an electrically heated furnace (electrically fused) or a gas/oxygen-fueled furnace (flame fused). Fused quartz is normally transparent. The optical and thermal properties of fused quartz are superior to those of other types of glass due to the purity of quartz. Due to these properties, quartz is used in markets such as semiconductor fabrication and laboratory equipment. It has better ultraviolet transmission than other glasses, making it ideal for use in lenses and other optical devices. The low coefficient of thermal expansion of quartz also makes it a useful material for any application where wide temperature differences occur.
The purity demanded is a SiO2 content of >99.995%. It is the physical properties of this pure quartz that give it this exceptional material quality that makes it the choice of several industries.
A number of unique optical, chemical, mechanical, electrical and thermal properties have made quartz glass an indispensable material in the fabrication of high-tech products. A full list of these properties is available here.