fused quartz sheet is a glass made from almost pure silica (silicon dioxide, SiO2) in amorphous (non-crystalline) form. It differs from all other commercial glasses which have additives to lower the melt temperature.
Fused quartz is manufactured by melting high-purity sand crystals in either an electrically heated furnace (electrically fused) or a gas/oxygen-fueled furnace (flame fused). This process creates glass with many different optical properties.
This amorphous glass may be used in a variety of applications for its excellent physical and optical properties. It is a strong and durable material that can be formed, cooled and annealed without cracking.
It has a low thermal expansion coefficient making it highly resistant to heat and shock. It also becomes less viscous with temperature.
In addition, it has a high energy damage threshold and is ideal for use with high-energy lasers. It is also commonly used as an envelope for halogen lamps and high-intensity discharge lamp anodes, which need to operate at high temperatures to provide their desired brightness.
There are two types of quartz glass: Type II which is produced by flame fusion and Type III which is synthesized from a natural or synthetic precursor. Both have similar chemical purity and minimal bubble content.
UQG optics can supply a range of grades from a number of manufactures around the world in standard stock thicknesses or customised to suit your application. These include large plates up to 1 metre square for protecting equipment to precision optical windows with multi-layers.