General Borosilicate Crown Glass

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Description

Crown glasses are optical glasses with a relatively low refractive index in combination with a low dispersion.

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

20.0 °C

2.4 - 2.5 g/cm³

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Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

70 - 80 GPa

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Hardness, Knoop, HK2

20.0 °C

510 - 630 [-]

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Poisson's ratio

20.0 °C

0.2 - 0.22 [-]

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

300.0 °C

6.6E-6 - 9.3E-6 1/K

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from 100 to 300°C

Glass transition temperature

500 - 570 °C

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Specific heat capacity

20.0 °C

0.68 - 0.87 J/(kg·K)

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Thermal conductivity

20.0 °C

0.18 - 1.32 W/(m·K)

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Optical

PropertyValue

Abbe number

64.06 - 66.95 [-]

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Refractive index

1.5 - 1.52 [-]

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