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 window
  • Optical quartz glass substrate
  • 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 SilicaQuartz glass 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 of quartz glass can not be outperformed by any other industrial glass material. Our quartz glass components and fused silica optics are made from large silica glass blocks, called quartz glass "boules". This raw fused quartz glass material is 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 your individually sized quartz window or your polished quartz glass substrate made of our UV-Quality Quartz Glass, please click the button below:

Request quartz glass

Specifications & Properties of
UV-Grade Quartz Glass / Fused Silica*

Quartz Glass opticalö Transmission
Typ. transmisssion of UV-grade Quartz Glass



  • T > 80% at 185nm
    (only UV-quality Quartz Glass)
  • Transmissions of other Quartz Glass
    qualities on request

Refractive Index

  • nd = 1,45846


  • 2,20 g/cm3


Inclusion Classes

Average Coefficient of Thermal Expansion

  • approx. 0,57 x 10-6/K

Thermal Characteristics

  • Softening Point approx. 1585°C
  • Annealing Point approx. 1042°C
  • Strain Point approx. 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"