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Zerodur is a glass-ceramic material known for extremely low thermal expansion. That means its size changes very little when temperature changes. Because of that stability, it is used for precision optical parts like mirrors and reference surfaces. It is a common choice in high-precision instruments where drift would ruin measurements.
read more about zerodur ...In optics, tiny shape changes can shift focus and distort measurements. A low-expansion material helps keep mirror shape stable across day-to-night temperature swings. This is especially important in telescopes, lithography, and metrology setups. Stability can improve repeatability and long-term accuracy.
Zerodur is used for telescope mirrors, mirror blanks, and stable optical benches. It is also used for calibration standards and reference flats in measurement labs. Some systems use it for mounting structures where thermal stability matters. It is usually not used for everyday consumer optics because it is specialized and costly.
Some optics use fused silica, which also has low expansion and good optical clarity. Metals like aluminum expand much more with heat, so they need thermal control or design compensation. Zerodur is chosen when expansion must be as close to zero as practical. Material choice depends on budget, size, and manufacturing needs.
Zerodur is hard but can chip if struck at edges. Large parts require careful mounting so stress does not distort the surface. Cleaning follows standard optics practice to avoid scratches. For precision mirrors, surface coating and storage conditions also matter.
It is a glass-ceramic. It starts as a glass and is then heat-treated to create a controlled crystal structure. That structure gives it very low expansion.
Mirror shape must stay stable for sharp images. Temperature swings can warp materials that expand more. Zerodur helps keep the mirror figure stable.
No. Both can have low expansion, but they are different materials with different properties and manufacturing methods. Selection depends on the application and design constraints.
It is rigid and stable, but it can chip if handled roughly, especially at edges. Large pieces need careful support. Proper mounts help protect the surface and the figure.
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Zerodur® — A Low Thermal Expansion Glass Ceramic for Optical Precision Applications. Springer Nature Link. https://link.springer.com/chapter/10.1007/3-540-28245-9_4. Date Accessed March 10, 2026.
Glass ceramic ZERODUR®: Even closer to zero thermal expansion: a review, part 1. Semantic Scholar. https://pdfs.semanticscholar.org/95d6/2a918e9167a7781e9e7fda7b02a239938fcc.pdf. Date Accessed March 10, 2026.
ZERODUR®: deterministic approach for strength design. The University of Arizona. https://wp.optics.arizona.edu/optomech/wp-content/uploads/sites/53/2016/10/Hartmann-2012.pdf. Date Accessed March 10, 2026.
Fracture Toughness and Crack Growth of Zerodur. NASA. https://ntrs.nasa.gov/api/citations/19900011871/downloads/19900011871.pdf. Date Accessed March 10, 2026.