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Optical Grade Quartz Glass

Synthetic fused silica with UV-Quality

Special Properties

  • Excellent optical transmittance of ultraviolet light
  • Extreme heat resistance up to 1000 °C
  • Outstanding temperature shock resistance
  • Low coefficient of thermal expansion
  • High-purity glass composition
  • Very resistant to chemicals
  • Low fluorescence

Typical Applications

  • UV-transparent optics
  • Applications with very high operating temperatures
  • UV-windows
  • Flame observation glass
  • Substrates for dielectric coatings
  • Components for laser systems
  • Microscope slides and cover-slips for UV-applications
  • Mechanical quartz glass components
  • UV-measurement technology
  • Chemical resistant glass windows
  • Windows for space applications
  • Semiconductor technology

Get a price for
Quartz Glass Optics

48h-Express Service Also available in 48 h Express-Service*

Optical Quartz Glass is Synthetic Fused Silica

Quartz glass qualities that can be used for optics consist of high-purity, synthetically produced, molten quartz material. This type of quartz glass is also known as "fused-silica". The material contains practically only silicon and oxygen (silicon dioxide) and is characterized by a very high purity. Only such quality quartz materials offer this great UV-transmittance of more than 80% already at 185 nm while offering a very low absorption in this spectrum. This high UV-permeability is possible with hardly any other glass.

Also the enormous operating temperature range and the thermal strength of quartz glass is remarkable. It can be used continuously at temperatures of 1000 °C and it is highly resistant to thermal shock. These exceptional properties are resulting from the low coefficient of expansion of quartz glass.

High purity fused silica window for a semiconductor applicationThe unique chemical characteristics of this material are outstanding. Quartz glass is extremely resistant to salt solutions, acids and water. The chemical resistance to bases surpasses almost all other glasses.

Due to its purity, quartz glass shows remarkably good electrical properties. It has a very small conductivity and therefore offers a particularly high insulation resistivity. Electrical currents can flow essentially only through moving ionic impurities and such contaminations are marginal in quartz glass. This is an important property for semiconductor and electronic applications.


Quartz Glass Optics

We produce quartz optics mainly from quartz glass in the form of block glass, the so-called "boules". If required, the raw material can be selected and specified with a view to extremely low inclusions and bubbles. In addition, the index homogeneity grade of this quartz glass can be chosen down to ≤ 0,5 ppm. To fabricate an optic out of a boule, the raw glass is first sawn from the block, then formed into the desired shape, ground and optically polished. In this way, our company manufactures quartz glass windows, substrates, wafers, microscope slides, laser components and other optics on a daily basis.


Sight Glass Grade Quartz Glass Materials

In addition to the UV-quality materials described above, we also process lower grades of quartz glass used for temperature-resistant sight glasses or UV-lamp covers for example. As the material quality and the DUV-transparency are of secondary concern for such applications, the cheaper natural fused quartz types of materials can usually be used for the fabrication of such components. In contrary to optical fused silica, these glass materials are produced by melting natural quartz instead of high purity synthetical quartz. Hence, they cannot offer such high inner quality. This kind of materials are therefore less suitable for demanding applications. But because they offer similar good thermal properties and they are more economical as the high-end glass described above, these materials are typically used for high temperature viewports, lamp housings, etc. The data sheet of our natural fused quartz glass can be found here.


Get a Quote for Your Quartz Glass Component

In order to receive a quote for windows, substrates, glass-slides or other components based on optical grade quartz glass material with individual dimensions, please click on the following button:


Get a price for
Quartz Glass Optics



Express Service Production 48h-Express Service

Also for optics grade quartz glasses we offer a fabrication within our 48 h Express-Service. The glass thicknesses possible in the scope of the express-service are listed below. All of these quartz glass materials have double side polished surface finishes. You can open a price inquiry form by clicking on a desired glass thickness below. Please, select the express option in the inquiry form in case you want to take advantage of this service at extra cost:

*Express-Service glass thicknesses:
0,30 mm ; 0,50 mm ; 1,00 mm; 2,00 mm and 3,00 mm.


Specifications & Properties

Transmittance of UV-grade fused silica glass

Zoom in to view more details
(Transmittance curve for synthetic quartz glass)

Ultraviolet Transmission

  • T > 80% at 185 nm
    (only UV-grade quartz glass = fused silica)
  • Transmittance of non-UV-grade quartz material
    per inquiry

Refractive Index

  • nd = 1,4585 (fused silica)


  • 2,20 g/cm3

Young's Modulus

  • typ. 74 Gpa


  • Homogeneity specifications per inquiry
  • Index homogeneities of UV-grade quartz glass materials down to ≤ 0,5 ppm are possible on demand

Inclusion Classes

Average Coefficient of Thermal Expansion

  • approximately 0,57 x 10-6/K


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

Dielectric Constant

  • εr: 3,9 (500 MHz)

Our company processes quartz glass from all leading raw glass manufacturers (Corning, Heraeus, Tosoh, SCHOTT, Saint Gobain, GE, etc). Detailed specifications, and properties of all optical fused silica and fused quartz glass qualities we process can be requested.


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


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