Zerodur Glass-Ceramic

Glass Type: Glass Ceramics


ZERODUR is a zero expansion glass ceramic with extraordinary properties. It is widely used in applications where unavoidable temperature changes could influence critical size and distance accuracies. The homogeneity of the material properties of ZERODUR® enables optomechanical engineering solutions with long-term mechanical and thermal stability.

Thermal PropertiesMechanical Properties
Thermal Coefficient of Expansion0.0580.10x10-6/°Density2.53 g/cm3 (at 20°C / 68°F)
Annealing Point970°Knoop Hardness 620 kg/mm2
Softening PointN/AYoung's Modulus90.3 Gpa
Strain PointN/APoisson's Ratio0.243
Chemical PropertiesMechanical Properties
Hydrolytic Resistanceclass1Dielectric ConstantE=7.4 MHz @R.T.
Acid Resistanceclass1Resistivity 2x 10Λ13
Alkali Resistanceclass1Dielectric StrengthN/A
Optical Properties
Refractive Index1.5424 (587.6 nm)