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Quartz Glass

Synthetic Fused Silica with UV-Quality for Optics

Special Properties

  • Excellent transmittance for ultraviolet light
  • Extremely temperature resistant up to 1000 °C
  • High thermal shock resistance
  • Small coefficient of thermal expansion
  • High-purity glass composition
  • Very high chemical strength
  • Crystal clear appearance
  • Low fluorescence
  • Outstanding electrical properties
  • Produced by melting the purest ingredients

Typical Applications

  • UV-transparent quartz glass optics
  • Quartz glass components
  • Quartz wafers for semiconductor applications
  • Substrate glasses for mirror coatings
  • Flame observation glasses
  • Deep-UV (DUV) lighting applications
  • Quartz components for ultraviolet lasers
  • Quartz microscope slides and cover glasses for medical applications
  • Industrial quartz glass components
  • UV-measuring instruments
  • Optical high-temperature applications
  • Chemically resistant glass parts
  • Heat resistant quartz items
  • Space applications

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Quartz Glass

48h-Express Service 48-hour express-service possible*


For detailed information on selecting the appropriate quartz glass grade for your application, please refer to our Quartz Glass FAQ page.

Optical Quartz Glass is Synthetic Fused Silica

Quartz glass used for optics is made of high purity synthetic quartz. This grade of quartz glass is known as "Fused Silica". The crystal-clear amorphous silicon dioxide material contains only silicon and oxygen and has near-zero impurities. Only such unique quartz glass grades offer this excellent transmission for UV-light of greater than 80% already at wavelengths as low as 185 nm.

The enormous operating temperature range and the thermal load capacity of quartz glass are unparalleled. It can operate permanently at up to 1000 °C and is very resistant to temperature changes. These outstanding properties are possible due to the low expansion of quartz glass.

High purity quartz glass windowAs well, the chemical strength of this unique material is remarkable. Quartz glass is particularly resistant to saline solutions, acids, and water. The chemical resistance of quartz glass to bases surpasses almost all other glass materials.

Excellent electrical properties make quartz glass an ideal material for use in semiconductor technology. Currents can only flow through moving ionic impurities, and such contaminations are marginal in quartz glass. Therefore it has minimal conductivity and offers a very high electrical insulation resistance, which is an essential requirement for a glass to be used in electronics and semiconductor applications.


Quartz Glass Optics

We fabricate custom optics of quartz glass mainly from large blocks, the so-called quartz boules. If necessary, the raw glass materials can be selected and specified for low amounts of inclusions and bubbles. You can choose the index homogeneity down to ≤ 0,5 ppm. The first step in producing an optic from a quartz glass boule is to cut the required material from the quartz block. After this process, the quartz glass is shaped, finely ground, and polished according to the respective requirements. In this way, our company fabricates UV-transparent quartz parts like substrate glasses, quartz glass wafers, microscope slides, laser components, and many other quartz glass items every day.


Get a Quote!

To receive a quotation for windows, substrates, or other parts based on our UV-grade optical quartz glass with individual dimensions, please select a thickness from the table in the specifications or use the following button.


Get a price quote for
Quartz Glass

48h-Express Service 48-hour express-service possible*


Specifications & Properties

Transmittance spectrum of synthetic
Fused Silica in the UV to IR range

Spectral curve of Fused Silica glass
Enlarge view and show details

Glass thicknesses

Optical quartz glass is a block glass. Therefore there are no standard thicknesses. Consequently, the glass thickness must always be specified individually. To offer our customers high availability and the best possible service, we continually polish to the following glass thicknesses, which are available quickly. You can even order these within our 48-hour express-service:
Please click on glass thickness to request:

Thickness (mm)


48h-Express Service
0,50 ±0,050
1,00 ±0,100
2,00 ±0,150
3,00 ±0,100
Please request other thicknesses individually.
Thicknesses marked with "" are available in 48-hour express-service.

Ultraviolet Transmission Properties

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

Refractive Index

  • nd = 1,4585 (Fused Silica)


  • 2,20 g/cm3

Young's Modulus

  • 74 GPa (typical value)


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

Inclusion Classes

Glass Composition

  • Silicon dioxide (SiO2)

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)


Fused Quartz Glass for Industrial Sight Glass Applications

Besides the grades of fused silica materials as described before, we also process lower quartz glass qualities for applications in the industry that only require sight glass functionality. Since the inner material quality and the DUV transparency of the quartz glass are of secondary concern in those cases, we can use the less expensive "Natural Fused Quartz" for the fabrication of such items. Unlike Fused Silica, these quartz glass grades are made by melting natural quartz instead of high purity synthetic quartz, and they contain significantly more contaminants. Hence, these materials cannot offer such a high material quality and homogeneity as Fused Silica, and they are typically used for less demanding applications. Nevertheless, they have an almost identical coefficient of expansion, a similar high thermal load capacity, and about the same thermal shock resistance. Fused quartz also features nearly the same chemical strength.

These quartz materials are significantly more economical than the High-End types of quartz glass. Hence, they are the best choice for heat-resistant sight glasses, lamp housings, UV lighting systems, transparent furnace panes, and other industrial quartz glass parts. You can find further information, specifications, and properties of this quartz glass type in our "Fused Quartz" spec-sheet.

Our company processes quartz glass materials from all leading manufacturers in the quartz glass industry (Corning, Heraeus, Tosoh, SCHOTT, Saint Gobain Quartz, Shin-Etsu, GE, and many more). Please contact us for detailed specifications and properties of the full range of quartz glass qualities we process.


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

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Last update 17.06.2020