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Quartz Glass with Optical Quality

Synthetic UV-grade fused silica

Special Properties

  • Excellent 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
  • Excellent electrical insulation properties
  • Produced by melting the purest raw materials

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 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. This type of 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 quartz glass materials offer this great UV-transmittance of more than 80% already at 185 nm, while offering a very small 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 continuously used at temperatures of 1000 °C and it is highly resistant to thermal shock. These exceptional thermal properties are resulting from the low coefficient of expansion of quartz glass.

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

Due to its high purity, quartz glass also has remarkably good electrical properties. Since electric currents can only flow through moving ionic impurities, which are marginal in quartz glass, it has very low conductivity and therefore offers a particularly high insulation resistance. This is an important requirement for many semiconductor and electronic applications.


Quartz Optics

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


Quartz Glass Materials for Sight Glass Applications

In addition to the UV-grades of fused silica described above we also process lower grades of quartz glass for applications that require temperature-resistant sight glasses or for UV-lamp covers for example. As the material quality and the DUV-transparency are of secondary concern for such applications, the more economical natural fused quartz types of materials can usually be taken for the fabrication of such components. Unlike fused silica, these glass materials are produced by melting natural quartz instead of high-purity synthetic quartz. Hence, they cannot offer such high inner glass 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 than the high-end glass described above, these materials are typically used for high temperature viewports or for lamp housings, etc. For further information about those materials, please visit our natural fused quartz data-sheet.


Get a Quote for Your Quartz Component

In order to receive a quote for windows, substrates, 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 glass, we also offer a fabrication within the scope of our 48 h Express-Service. The thicknesses possible within the express-service are listed below. All of these quartz 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

Transmittance curve for optical quartz glass
Zoom in to view more details

Ultraviolet Transmission

  • T > 80% at 185 nm
    (only UV-grade materials = 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 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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