General Borosilicate Glass

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Description

Borosilicate glasses have a remarkably low coefficient of thermal expansion and are therefore very resistant to thermal shock. Their main glass-forming constituents are substantial amounts of silica and boron trioxide. Usually, one distinguishes between non-alkaline earth borosilicate glass, alkaline-earth-containing borosilicate glass and high-borate borosilicate glass.

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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Properties

General

PropertyTemperatureValue

Density

23.0 °C

2.1 - 2.8 g/cm³

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Mechanical

PropertyTemperatureValue

Elastic modulus

23.0 °C

50 - 70 GPa

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Hardness, Knoop, HK2

23.0 °C

400 - 480 [-]

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Poisson's ratio

23.0 °C

0.2 - 0.22 [-]

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Shear modulus

23.0 °C

26.5 - 27 GPa

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Thermal

PropertyTemperatureValue

Annealing temperature

470 - 640 °C

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Coefficient of thermal expansion

300.0 °C

3.2E-6 - 7.38E-6 1/K

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Glass transition temperature

440 - 560 °C

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Thermal conductivity

23.0 °C

0.96 - 1.2 W/(m·K)

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Vicat softening temperature

460 - 840 °C

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Electrical

PropertyTemperatureValueComment

Dielectric constant

23.0 °C

4.1 - 6.7 [-]

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at 1MHz

Loss tangent

23.0 °C

0 - 0.01 [-]

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at 1MHz

Optical

PropertyValue

Refractive index

1.47 - 1.52 [-]

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