Robax Glass-Ceramic

Glass Type: Glass Ceramics


ROBAX® is a highly transparent glass-ceramic having virtually zero thermal expansion and sufficient mechanical resistance required for all standard applications. It is produced in flat, rolled sheets. As a result of its extremely low thermal expansion, ROBAX® can be subjected to extreme temperature differences

Thermal PropertiesMechanical Properties
Thermal Coefficient of Expansion0 ± 0.5 x 10-6/KDensity2.56 g/cm3
Annealing PointN/AShear Modulus36.8 GPa
Softening PointN/AYoung's Modulus92 dPa
Strain Point660 °C/1,220 °FPoisson's Ratio0.25 @ 25°C
Chemical PropertiesElectrical Properties
Hydrolytic ResistanceISO 719 Grain class: HGB 1Dielectric Constant7 8MHz, 25° C
Acid ResistanceDIN 12116: min.Class S3Resistivity=1.00e+8 Ω-cm @175°C
Alkali ResistanceISO 695: min. Class A2Dielectric StrengthN/A
Optical Properties
Refractive IndexN/A