Extremely Low Thermal Expansion Glass-Ceramic



ZERODUR® glass-ceramic has an extremely low coefficient of thermal expansion over a wide temperature range. It is ideal in applications where geometrical shape and distance changes must be kept low under temperature variations.

Extremely low coefficient of thermal expansion across a wide temperature range

Excellent CTE homogeneity throughout the total


Wide size range of precise geometrical shapes available

Extremely smooth surface with residual roughness below 1nm

Excellent chemical stability and resistance to harsh atmospheric conditions


By default, the mean coefficient of thermal expansion (CTE) of ZERODUR® is measured within the temperature range of 0°C to 50°C


Forms of Supply​

  • Cut discs

  • Rectangular blocks

  • Prisms

  • Rods

  • Complex cut piece geometry

  • Light-weighting optional


Common Applications

  • Mirror substrate in large earthbound or orbital telescopes (GTC, Keck I, Keck II, Hubble, Chandra, SOFIA, VLT, ELT)

  • IC and LCD lithography

  • High precision metrology

  • Ring laser gyroscopes

  • Optical flats


Maximum operating temperature 600°C 



SKAN hold a variety of ZERODUR® stock. Please get in touch to discuss your requirement.





ZERODUR® K20 is optimised to withstand higher operating temperatures up to 850°C, available as small, high precision components.