General Non Alkaline Earth Borosilicate Glass



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.

Ashby charts

See where falls on the material property chart for Density against Elastic modulus in your materials selection and design process.



Density ρ

2.2 - 2.8 g/cm³ at 20 °C


Elastic modulus E

63 - 64 GPa at 20 °C

Poisson's ratio ν

0.2 [-] at 20 °C


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


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


Refractive index nd

1.47 [-]

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.