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General Aluminosilicate Glass

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Description

Aluminosilicate glass combines high chemical resistance with high operating temperatures. However, it is more difficult to manufacture compared to borosilicate glass.

Properties

Electrical

Dielectric constant εr

6.1 - 7.7 [-] at 20 °C

at 1MHz

Electrical resistivity ρel

0.13 - 0.14 Ω·m at 20 °C

Loss tangent tanδ

1.5E-3 - 0.01 [-] at 20 °C

at 1MHz

General

Density ρ

2.4 - 2.7 g/cm³ at 20 °C

Mechanical

Elastic modulus E

70 - 80 GPa at 20 °C

Hardness, Knoop, HK2 HK2

500 - 640 [-] at 20 °C

Hardness, Vickers HV

480 - 670 [-] at 20 °C

Poisson's ratio ν

0.2 [-] at 20 °C

Shear modulus G

26000 - 31700 GPa at 20 °C

Optical

Refractive index nd

1.49 - 1.55 [-]

Thermal

Annealing temperature Tanneal

610 - 800 °C

Coefficient of thermal expansion α

3.38E-6 - 9.8E-6 1/K at 300 °C

Glass transition temperature Tg

620 - 790 °C

Thermal conductivity λ

0.91 - 1.1 W/(m·K) at 20 °C

Vicat softening temperature Tsoft

820 - 1010 °C