ZERODUR® Transparent Glass Ceramic
Special Properties
- Very low thermal expansion
- High material homogeneity
- High operating temperature
Typical Applications
- Precision Optics
- Zerodur Mirror Substrates for Large Astronomical Telescopes
- Mirror Substrates for X-Ray Telescopes
- Optical Elements for Comet Probes
- Ring Laser Gyroscopes
- Standards for Precision Measurement Technology
- Lightweight Honeycomb Mirror Supporters
ZERODUR® glass ceramic made by Schott is an anorganic, non-porous material, made by a process of controlled volume crystallization. Zerodur contains a crystallized phase and a rest glass phase which together define the unique properties of this exceptional material. Zerodur has an extreme low coefficient of thermal expansion, which even can become zero or slightly negative in some temperature ranges. Another unique characteristic of ZERODUR is its exceptional good homogeneity. Even in large material blocks, the fluctuations of mechanical and thermal properties are nearly not measureable. A good transparency in the range of about 400-2.300nm allows a verification of the inner quality of Zerodur. Therefore it can be ensured, that if required, neither bubbles nor inclusions in ZERODUR are undetected.
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ZERODUR Block with holes |
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To request your part made of ZERODUR® zero expansion glass ceramics with your individual dimensions, please click the button below:
Specifications*
Show transmission curve
Refractive Index
- nd = 1,5424 (587,6nm)
- ng = 1,5544 (435,8nm)
Density
- 2,53 g/cm3
Coefficient of Thermal Expansion (0-50°C)
- 0 ± 0,10 x 10-6/K
- Show curve of coefficient of thermal length expansion
Operating Temperature
- up to 600°C
Chemical Properties
Hydrolytic Resistance- (ISO 719) HGB 1
- (ISO under construction) Class 1.0
- (ISO 8424) Class 1.0
Electrical Characteristics
Dielectric Constant- 8,0 (1kHz)
- 7,4 (1 MHz)
- 29 x 10-3 (1kHz)
- 15 x 10-3 (1 MHz)