General High Borate Borosilicate Glass

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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.

This material data has been provided by Matmatch.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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23.0 °C

2.2 - 2.3 g/cm³

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Elastic modulus

23.0 °C

50 - 70 GPa

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Poisson's ratio

23.0 °C

0.2 - 0.22 [-]

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Annealing temperature

465 - 560 °C

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Coefficient of thermal expansion

300.0 °C

3.9E-6 - 5.1E-6 1/K

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Glass transition temperature

440 - 530 °C

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Thermal conductivity

23.0 °C

1 - 1.2 W/(m·K)

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Vicat softening temperature

705 - 775 °C

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Dielectric constant

23.0 °C

4.7 - 5.7 [-]

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at 1MHz

Loss tangent

23.0 °C

2.2E-3 - 8E-3 [-]

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at 1MHz



Refractive index

1.48 - 1.49 [-]

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