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General Barium 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

2.8 - 3.2 g/cm³ at 20 °C

Mechanical

Elastic modulus E

70 - 80 GPa at 20 °C

Hardness, Knoop, HK2 HK2

470 - 620 [-] at 20 °C

Poisson's ratio ν

0.23 - 0.25 [-] at 20 °C

Shear modulus G

29000 - 33000 GPa at 20 °C

Optical

Abbe number νd

55.98 - 59.71 [-]

Refractive index nd

1.54 - 1.57 [-]

Thermal

Coefficient of thermal expansion α

6.9E-6 - 9E-6 1/K at 300 °C

from 100 to 300°C

Glass transition temperature Tg

550 - 600 °C

Specific heat capacity cp

0.62 - 0.7 J/(kg·K) at 20 °C

Thermal conductivity λ

0.8 - 1.19 W/(m·K) at 20 °C