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General High Borate Borosilicate Glass

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Description

High Borate Borosilicate Glass exhibit excellent sealability to metals in the expansion range of tungsten and molybdenum. In general, high borate borosilicates are less chemically resistant than non alkaline earth and alkaline earth borosilicate glasses.

Properties

Electrical

Dielectric constant εr

4.7 - 5.7 [-] at 20 °C

at 1MHz

Loss tangent tanδ

2.2E-3 - 8E-3 [-] at 20 °C

at 1MHz

General

Density ρ

2.2 - 2.3 g/cm³ at 20 °C

Mechanical

Elastic modulus E

50 - 70 GPa at 20 °C

Poisson's ratio ν

0.2 - 0.22 [-] at 20 °C

Optical

Refractive index nd

1.48 - 1.49 [-]

Thermal

Annealing temperature Tanneal

465 - 560 °C

Coefficient of thermal expansion α

3.9E-6 - 5.1E-6 1/K at 300 °C

Glass transition temperature Tg

440 - 530 °C

Thermal conductivity λ

1 - 1.2 W/(m·K) at 20 °C

Vicat softening temperature Tsoft

705 - 775 °C