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Quartz Glass, UV-Grade Fused Silica

Synthetic quartz glass with high ultraviolet transmittance

Special Properties

  • Low coefficient of thermal expansion
  • Enormous operating temperature range
  • UV-quality glass (high ultraviolet light transmittance)
  • Very good temperature shock resistance
  • High purity glass
  • Low fluorescence
  • High chemical resistance
  • Completely free of soda

Typical Applications

  • UV-transparent glass components
  • Optical high temperature windows
  • UV-measurement technology applications
  • Glass substrates for thin film coatings
  • UV-transparent windows
  • Space technology optics
  • Semiconductor applications
  • Cover slips & microscope slides with ultraviolet permeability

What is synthetic quartz glass and what can it do?

Fused Silica (SiO2) is a synthetic molten, high purity, amorphous, non-crystalline quartz glass with exceptional properties. It is made by melting the purest raw materials and it is used for applications, that require Quartz Glass window made of Fused Silicaa very good thermal strength or whenever an excellent transparency for wavelengths below the visible spectrum is critical. The glass material has an extremely high transmissivity for ultraviolet light and is often used for UV-applications. Due to its low coefficient of thermal expansion, quartz glass has a very good thermal shock resistance. The exceptional thermal properties enable fused silica to hold up very high thermal loads. Therefore, quartz glass is often used for the fabrication of heat resistant windows, that must withstand operating temperatures of up to 1000 °C without melting. The very high UV-light transparency of the glass cannot be outperformed by any other industrial glass material. Likewise, the chemical stability of this unique material is one of the best. It is exceedingly resistant against saline solutions, acids and water. Also the high chemical durability of quartz glass against bases is top class and better than it is for most other glass materials. Particularly the high temperature resistance and the high grade purity make fused quartz glass, a perfect material for many semiconductor applications.

From raw glass to quartz glass optics

Our fused silica quartz glass components are fabricated out of large non-crystalline silica glass blocks, called "boules". This raw glass material is ground, polished, shaped and surface finished according to customer's specifications, until finally an optics has emerged from the glass. If required, our UV-grade quartz glass can be selected for a low content of inclusions and/or a high refractive index homogeneity and purity. We are processing many different available quartz, fused silica or fused quartz raw glass materials with different properties from nearly any well-known raw glass supplier worldwide and we make all kinds of optics out of these different material grades.

In order to request a quotation for quartz glass slides, windows or a polished substrates made of our quartz glass at custom dimensions, please use the button below. Please choose UV-grade for a transmission of >80% at 185nm. Choose sight glass grade for applications where ultraviolet transmittance and optical properties are of secondary concern or if you want to use fused silica glass due to its thermal properties only:

Quotation for UV-grade quartz glass


Quotation for sight glass quality quartz

Specifications & Properties

Transmittance of fused silica

Typical transmittance of quartz glass

Optical Transmission

  • T > 80% at 185nm (only UV-grade quartz glass)
  • Transmissivity of non-UV-grade quartz materials on request

Refractive Index

  • nd = 1,45846


  • 2,20 g/cm3


Inclusion Classes

Average Coefficient of Thermal Expansion

  • approximately 0,57 x 10-6/K

Thermal Properties

  • Softening point approximately 1585 °C
  • Annealing point approximately 1042 °C
  • Strain point approximately 893 °C

Further further detailed specifications such as electrical properties, mechanical strength, impurities, index homogeneity, further technical properties etc for the different grades of the quartz glass materials, please use our request form.

All given details and specifications are mean reference values and are not guaranteed. In addition, please consider our "Notes on technical specifications"