Zerodur
Zero-expansion glass-ceramic that holds its dimensions through severe temperature swings. The substrate of record for interferometry reference flats and large astronomical mirrors.
Flat optics material
Typical properties
- Transmission range
- 0.4 – 2.3 µm
- Refractive index
- 1.5424 (nd)
- Density
- 2.53 g/cm³
- Thermal expansion (CTE)
- 0 ± 0.007 × 10⁻⁶ /K (Class 0)
- Young's modulus
- 90 GPa
Published values for this material class, given to help you shortlist a substrate. They are not lot-specific guarantees. Request the SPEKTON datasheet for certified figures against your specification.
Download Technical Datasheet (PDF)Datasheet referenced from Schott.
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