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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)
  • High temperature shock resistance
  • High purity glass
  • Low fluorescence
  • High chemical resistance

Typical Applications

  • UV-grade quartz glass components
  • Quartz glass cover slips
  • Quartz glass microscope slides
  • High temperature windows
  • UV-transparent windows
  • UV-measurement technology applications
  • Quartz glass substrates for thin film coatings
  • Space technology optics

Fused Silica (SiO2) is a synthetic molten, high purity amorphous quartz glass with exceptional properties. It is used for applications that require Quartz Glass window made of Fused Silicaa very good thermal stability or whenever a great transparency for wavelengths below the visible spectrum is critical. The material has an extraordinarily high optical transmissivity for ultraviolet light and is often used for UV-applications. Due to its low coefficient of thermal expansion, quartz glass has a very high thermal shock resistance. It can withstand very high operating temperatures. The very good UV-light transparency cannot be outperformed by any other industrial glass material. Likewise, the chemical stabilty of this unique material is one of the best. The material is exceedingly resistant against saline solutions, acids and water. Also the high chemical durability against bases is top class and better than for most other glass materials.

Our quartz glass optics and fused silica components are fabricated out of large non-crystalline silica glass blocks, called quartz glass "boules". This raw material is ground, polished and shaped according to customer's specifications. If required, UV-grade quartz glass or Fused Silica 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 glass, fused silica or fused quartz raw materials with different properties from nearly any well-known quartz raw glass supplier worldwide.

In order to request a quotation for a quartz window or a polished quartz glass substrate made of our UV-Quality Quartz Glass with custom dimensions, please use the button below:

Request quartz glass

Specifications & Properties

Quartz Glass optical transmission

Typical transmittance of quartz glass



  • T > 80% at 185nm
    (only UV-grade Quartz or Fused Silica material)
  • Transmissions of non-UV-grade quartz glass 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 for the different grades of quartz, 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"