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.

Properties

General

Density ρ

2.4 - 2.5 g/cm³ at 20 °C

Mechanical

Elastic modulus E

70 - 80 GPa at 20 °C

Hardness, Knoop, HK2 HK2

510 - 630 [-] at 20 °C

Poisson's ratio ν

0.2 - 0.22 [-] at 20 °C

Thermal

Coefficient of thermal expansion α

6.6E-6 - 9.3E-6 1/K at 300 °C

from 100 to 300°C

Glass transition temperature Tg

500 - 570 °C

Specific heat capacity cp

0.68 - 0.87 J/(kg·K) at 20 °C

Thermal conductivity λ

0.18 - 1.32 W/(m·K) at 20 °C

Optical

Abbe number νd

64.06 - 66.95 [-]

Refractive index nd

1.5 - 1.52 [-]

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.