ZERODUR®

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.

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

Low thermal expansion even in harsh environments

The inorganic, non-porous lithium aluminum silicon oxide glass-ceramic, ZERODUR® is characterized by its extremely low thermal expansion, which is homogeneous throughout the entire volume. Additionally, it possesses a very low rate of imperfections, high strength compared to other glass-ceramics and is transparent to visible light. Smooth surfaces with a roughness in the sub-nm range are also achievable.

Explore material properties in detail