This website uses cookies to improve service quality. You will find more information about cookies on the privacy policy page.

General Borosilicate Crown Glass

.XLSX
.PDF
Save

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

Optical

Abbe number νd

64.06 - 66.95 [-]

Refractive index nd

1.5 - 1.52 [-]

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