Technical glass ceramics picture, Zerodur
 
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ZERODUR® Transparent Glass Ceramic

Special Properties

  • Very low thermal expansion
  • High material homogeneity
  • High operating temperature

Typical Applications

  • Precision Optics
  • Zerodur Mirror Substrates for Large Astronomical Telescopes
  • Mirror Substrates for X-Ray Telescopes
  • Optical Elements for Comet Probes
  • Ring Laser Gyroscopes
  • Standards for Precision Measurement Technology
  • Lightweight Honeycomb Mirror Supporters

ZERODUR® glass ceramic made by Schott is an anorganic, non-porous material, made by a process of controlled volume crystallization. Zerodur contains a crystallized phase and a rest glass phase which together define the unique properties of this exceptional material. Zerodur has an extreme low coefficient of thermal expansion, which even can become zero or slightly negative in some temperature ranges. Another unique characteristic of ZERODUR is its exceptional good homogeneity. Even in large material blocks, the fluctuations of mechanical and thermal properties are nearly not measureable. A good transparency in the range of about 400-2.300nm allows a verification of the inner quality of Zerodur. Therefore it can be ensured, that if required, neither bubbles nor inclusions in ZERODUR are undetected.

ZERODUR honeycomb mirror mount Because of it's unique properties, ZERODUR is a preferred material for components like this lightweight honeycomb mirror mount that was made for a satellite mirror.


To request your part made of ZERODUR® zero expansion glass ceramics with your individual dimensions, please click the button below:


Specifications*

 
Show transmission curve

Refractive Index

  • nd = 1,5424 (587,6nm)
  • ng = 1,5544 (435,8nm)

Density

  • 2,53 g/cm3

Coefficient of Thermal Expansion (0-50°C)

Operating Temperature

  • up to 600°C

Chemical Properties

Hydrolytic Resistance
  • (ISO 719) HGB 1
Alkali resistance
  • (ISO under construction) Class 1.0
Acid Resistance
  • (ISO 8424) Class 1.0

Electrical Characteristics

Dielectric Constant
  • 8,0 (1kHz)
  • 7,4 (1 MHz)
Loss Factor tan d
  • 29 x 10-3 (1kHz)
  • 15 x 10-3 (1 MHz)

Flatness

Surface Quality

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