ZERODUR® Zero-Expansion Glass-Ceramic
ZERODUR glass-ceramic is a nonporous inorganic glass-ceramic with a completely unoriented and anisotropic structure. The balance between its glassy and crystalline phases gives it a near-zero thermal expansion coefficient. Because the chemical properties and hardness of these phases are similar to optical glass, it can be processed with the same equipment and tools used for optical and technical glass, including cutting, grinding and polishing.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Coefficient of Linear Thermal Expansion [Expansion Class 2 / 0° to 50°C] | 0 ± 0.10 x 10-6 K-1 |
| Coefficient of Linear Thermal Expansion [Expansion Class 1 / 0° to 50°C] | 0 ± 0.05 x 10-6 K-1 |
| Coefficient of Linear Thermal Expansion [Expansion Class 0 / 0° to 50°C] | 0 ± 0.02 x 10-6 K-1 |
| Uniformity of the Coefficient of Linear Thermal Expansion [Standard Value] | 0.01 x 10-6 K-1 and 0.02 x 10-6 K-1 |
| Uniformity of the Coefficient of Linear Thermal Expansion [Supplied on Request] | < 0.01 x 10-6 |
| Average Impurity Content [Standard ZERODUR Glass-Ceramic with Dimensions below 500mm] | 5/100 cm3 |
| Maximum Diameter of an Individual Impurity [Standard ZERODUR Glass-Ceramic with Dimensions below 500mm / Maximum Diameter of the Evaluation Volume 1.4] | 3.0 (Maximum Diameter of the Evaluation Volume 1.4) |
| Striae (Stress Birefringence) [Standard ZERODUR Glass-Ceramic with Dimensions below 500mm] | < 60 nm/striae |
| Volume Stress (Stress Birefringence) [Standard ZERODUR Glass-Ceramic with Dimensions below 500mm] | < 6 nm/cm |
| Density | 2.53 g/cm3 |
| Thermal Conductivity [20°C] | 1.46 W/(m x K) |
| Thermal Diffusivity [20°C] | 0.72 x 10-6 m2/s |
| Heat Capacity | 0.8 J/(g x K) |
| Young's Modulus [20°C] | 90.3 GPa |
| Poisson's Ratio | 0.243 |
| Knoop Hardness [0.1/20] | 620 |
Applications
Key Features
Datasheet
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