Close up of an orange disc of ZERODUR® glass-ceramic by SCHOTT


ZERODUR® glass-ceramic has been one of SCHOTT's most unique and extraordinary products for over 50 years. With an extremely low thermal expansion, it's essential for a large number of demanding high-tech applications requiring exceptional precision.
Hexagon-shaped ZERODUR® glass-ceramic by SCHOTT

Highly accurate under extreme conditions

The extremely low thermal expansion of ZERODUR® glass-ceramic is homogenous throughout the entire bulk volume, which makes it ideal for a large range of applications involving precise positioning or imaging under changing temperature conditions.

Disc of ZERODUR® glass-ceramic for telescope mirror

Impressive machinability from small to large

Thanks to its extraordinary machining properties, ZERODUR® can be manufactured in a variety of sizes and shapes, from tiny prisms to meter-sized mirror blanks. High degree light-weighting and surfaces optimized for bending strength are key areas of SCHOTT's expertise, which makes ZERODUR® ideal for space applications.

Range of SCHOTT ZERODUR® low thermal expansion glass-ceramics

Product variants

ZERODUR® is suitable for many high-tech applications, ZERODUR® TAILORED offers the best material for individual temperature requirements, and ZERODUR® K20 is suitable for your high-temperature applications.

More about variants
Different shapes and sizes of ZERODUR® K20 on grey background
Reference Teaser 01

A window into distant galaxies

SCHOTT’s ZERODUR® glass-ceramic ensures that crisp images are available to unlock the mysteries of the cosmos with the world's largest telescope.
More information

Thomas Werner, Head of the ELT Project, pictured with the 500th M1 segment
News & Innovation stories

Milestone reached for the giant primary mirror

500th ZERODUR® glass-ceramic mirror blank produced for the M1 primary mirror of the European Southern Observatory’s Extremely Large Telescope (ELT).

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Want to know more? Let’s talk

Whether you need more information, samples, a quote, or advice for a project, we would be delighted to talk to you.

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