7059 Barium-Borosilicate Glass

Glass Type: Borosilicate


Coming 7059 barium-borosilicate glass is an almost alkali-free technical flat glass from Coming with a good thermal shock resistance. It has long been the standard of the electronics industry for thin-film circuits, which require special electrical properties. This is important for many electronic applications, because alkali ions are known to lower the performance, reliability and longevity of thin-film devices.

Thermal PropertiesMechanical Properties
Thermal Coefficient of Expansion0/300°C): 46.0 X 10 -7/°CDensity2.23 g/cm3 (at 25 °C/77°F)
Annealing Point639°C/1182°FKnoop Hardness418
Softening Point844°C/1551°FYoung’s Modulus6,89 x 103 kg/m m2
Strain Point539°C/ 1002° FPoisson’s Ratio0.20
Chemical PropertiesElectrical Properties
Hydrolytic ResistanceN/ADielectric Constant5,84 (20°C/1 MHz)
Acid ResistanceN/AResistivity13.1 X 250°C
Alkali ResistanceN/ADielectric StrengthN/A
Optical Properties
Refractive Index1.33 @ 589.3nm