Optical Glass picture, Quartz Glass
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Quartz Glass
UV-Quality Fused Silica

Special Properties

  • Low CTE (coefficient of thermal expansion)
  • Enormous operating temperature range
  • UV-Quality glass (high ultraviolet light transmission)
  • High temperature shock resistivity
  • High purity glass quality
  • Low fluorescence glass

Typical Applications

  • UV-quality quartz glass components
  • Highest temperature applications
  • Optical quartz glass windows
  • Optical quartz glass substrates
  • Quartz glass cover slips
  • Low thermal expansion SiO2 windows
  • UV-measurement technology
  • Quartz glass microscope slides
  • Space technology

Fused Silica (SiO2) is a synthetic molten, amorphous quartz glass. Quartz Glass window made of Fused SilicaThe material has an extraordinary high optical transmissivity for ultraviolet light. Due to its low coefficient of thermal expansion, quartz glass can withstand very high operating temperatures. The very good UV-light transparency can not be outperformed by any other industrial glass material. Our quartz glass and fused silica optics are made from large silica glass blocks, called quartz glass "boules". These raw materials are sawn, ground, polished and shaped according to customer's specifications. UV-grade quartz glass or Fused Silica can be selected for a low content of inclusions and/or a high refractive index homogeneity if required. We are processing many different available quartz glass, fused silica or fused quartz raw materials from nearly any well-known quartz raw glass supplier worldwide.

To request an individually sized quartz window or a polished quartz glass substrate made of our UV-Quality Quartz Glass, please click the button below:

Request quartz glass

Specifications & Properties

Quartz Glass optical transmission

Typical transmission curve of quartz glass



  • T > 80% at 185nm
    (only UV-quality Quartz Glas or Fused Silica)
  • Transmissions of other material qualities 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 Characteristics

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

Further detailed specifications on request.

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