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Fused Silica Quartz

Posted on February 15, 2018 By In Uncategorized With no comments

What is Fused Silica Quartz?

Fused silica quartz is an industrial raw material that is used to make many types of scientific items for such as spectrophotometer cuvettes, fluorometer cuvettes, flow channel cells, quartz microfluidic chips, and many other optical products used for flow cytometers and particle sizers. Fused silica quartz can also be used to manufacture refractory shapes due to the fact that the quartz material has great thermal shock resistance and are extremely stable to most chemical elements and compounds. This type of quartz can handle high concentration of acids and not be affected. The only acid that does effect the fused silica would be hydrofluoric acid. Even in low concentrations this would have a negative effect on the material. Flow channel cuvettes made from this material are frequently used for applications such as flow cytometry, particle counting, particle sizing, and other various applications.

Fused quartz and fused silica quartz are forms of glass that are mostly made up of silica in its non-crystalline form. They are manufactured using several different processes. The quartz formed by heating the material to its melting point and rapidly cooling it (called splat-quenching or melt-quenching) are referred to as vitresous. This term is the same as using the word glass, for example glass quartz.

Fused quartz or silica is produced by fusing high purity silica in a special furnace. This procedure is done at extremely high temperatures, over 1,000 degrees Fahrenheit.

Fused Silica Quartz Refractive Index Properties

The fused silica material has an absolute refractive index (ARI), measured at a wavelength of 193.368 nm, of up to about 1.560835. In another embodiment, the absolute refractive index of the quartz article is less than or equal to about 1.560820. In a third embodiment, the absolute refractive index of the quartz article is less than or equal to 1.560815. In a fourth embodiment, the quartz article has an ARI of less than or equal to 1.506810. IR grade also know as ED-C Quartz is a super purity synthetic fused silica material. IR Quartz is manufactured by melting of highly pure ashes in vacuum. It is transparent in the ultraviolet, visible and infrared spectral regions. It has no absorption bands in the visible region and has no OH absorption band at 2700 nm ("water band").

It is known that laser-induced degradation adversely affects the performance of fused silica quartz optical members by decreasing light transmission levels, altering the index of refraction, altering the density, and increasing absorption levels of the glass. Over the years, many methods have been proposed for improving the optical damage resistance of glass. It has been generally known that high purity quartz material prepared by such methods as flame hydrolysis, CVD-soot remelting process, plasma CVD process, electrical fusing of quartz crystal powder, and other methods, are susceptible to laser damage to various degrees.

What is Synthetic Fused Silica Quartz?

Made from a high concentration of silicon-rich chemicals, synthetic quartz is often formed using an ongoing fire hydrolysis process. This process involves chemical gasification of silicon, oxidation of this gas to silicon dioxide, and thermal fusion of the resulting dust (although there are alternative processes). The output of this process is a transparent quartz glass material with a super high purity and the best optical transmission in the deep UV aka ultraviolet, also known as the far ultraviolet range. One method involves adding silicon tetrachloride to a hydrogen-oxygen flame. A hydrogen oxygen flame produces a highly intense flame that can easily melt the quartz and ensures the quartz fuses properly.

Only a handful of companies in the world have the ability to make synthetic quartz material. NSG Precision Cells is one of these rare companies. NSG is a member of the Tosoh family and has been making silica quartz since the early 1930s.

Source by Simcha Dov

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