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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 with outstanding ultraviolet light transmittance)
  • Very good temperature shock resistance
  • High purity glass
  • Low fluorescence
  • High chemical resistance
  • Completely free of soda

Typical Applications

  • UV-transparent optics
  • Windows for high temperatures
  • UV-measurement technology
  • Glass substrates for thin film coatings
  • Optical windows for ultraviolet applications
  • Optics for space technology
  • Semiconductor production applications
  • Cover slips & microscope slides with high 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. The material is made by melting very pure raw materials and is used for applications, that require Fused Silica windowa very good thermal strength or an excellent transparency for wavelengths below the visible spectrum. Because quartz glass offers a remarkable transmissivity of ultraviolet wavelengths, it is often used for applications that use ultraviolet light. This very high UV-transparency cannot be outperformed by any other industrial glass material.

The excellent thermal properties enable fused silica to hold up very strong thermal loads and allow a very high operating temperature. Due to its low coefficient of thermal expansion, quartz glass shows a very good thermal shock resistance. Hence, the glass is often used for the fabrication of heat resistant windows, that must withstand high temperatures of up to 1000 °C without melting or breaking. Likewise, the superb chemical stability of quartz glass is one of the best. It is exceedingly resistant against saline solutions, acids and water and the high chemical durability of quartz glass against bases is top class. The chemical resistivity is much higher than that of most other glass materials. Particularly the high operating temperature range and the high grade of purity, make quartz glass a perfect material choice for various semiconductor applications.

From raw glass blocks to quartz glass optics

Most of our quartz glass components are fabricated out of large non-crystalline fused silica glass blocks, called "boules". This pure raw fused silica material is ground, polished, shaped and surface finished according to customer's specifications, until finally optics have emerged from the raw glass block. 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 polished fused silica substrates at custom dimensions, please use the button below. Please choose UV-grade glass for a transmission of >80% at 185nm. Choose sight glass grade for applications where ultraviolet transmittance and optical properties are of secondary concern or in case you want to use quartz glass due to its thermal properties only:

Quotation for UV-grade quartz glass

48h- Express Service icon

48-h Express Service available
(0,3 ; 0,5 ; 1,0 ; 2,0 and 3,0mm glass thickness)


Quotation for sight glass quality quartz

48h- Express Service icon

48-h Express Service available
(1,0 ; 2,0 and 3,0mm glass thickness only)



Transmittance of fused silica

Typical transmittance of fused silica

Optical Transmission

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

Refractive Index

  • nd = 1,45846


  • 2,20 g/cm3


  • Homogeneity specifications per request
  • Index homogeneities down to ≤ 0,5ppm possible
    on request

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, additional technical properties etc for the different grades of the quartz glass and fused silica 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"