General Borosilicate Glass

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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.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
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

2.1 - 2.8 g/cm³

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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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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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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



Refractive index

1.47 - 1.52 [-]

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