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General Non Alkaline Earth Borosilicate Glass

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Description

Non Alkaline Earth Borosilicate Glass is chemically durable and has the lowest thermal expansion coefficient in the group of commercial glasses. Thus, it is the gass to use when good thermal resistance, high chemical durability and high light transmission are key. This glass type is also referred to as borosilicate glass 3.3.

Properties

Electrical

Dielectric constant εr

4.6 - 5.8 [-] at 20 °C

at 1MHz

Loss tangent tanδ

1E-3 - 3.7E-3 [-] at 20 °C

at 1MHz

General

Density ρ

2.2 - 2.8 g/cm³ at 20 °C

Mechanical

Elastic modulus E

63 - 64 GPa at 20 °C

Poisson's ratio ν

0.2 [-] at 20 °C

Optical

Refractive index nd

1.47 [-]

Thermal

Annealing temperature Tanneal

560 - 640 °C

Coefficient of thermal expansion α

3.25E-6 - 4.6E-6 1/K at 300 °C

Glass transition temperature Tg

525 - 530 °C

Vicat softening temperature Tsoft

820 - 840 °C