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<p>in the ultraviolet. The low <a href="page.php?w=coefficient_of_thermal_expansion">coefficient of thermal expansion</a> of fused quartz makes it a useful material for precision mirror substrates or <a href="page.php?w=optical_flat">optical flat</a>s.</p>

<p><big> Manufacture </big></p>
<p>Fused quartz is produced by <a href="page.php?w=Melting">fusing</a> (melting) high-purity silica sand, which consists of <a href="page.php?w=quartz">quartz</a> crystals. There are four basic types of commercial silica glass:<br/>
* Type I is produced by electrically</p><p>
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