Borosilicate Glass Tube

Alternative and trade names
Pyrex®, Duran®


Borosilicate glass, known under trade names such as Pyrex® and Duran®, is widely used in chemical and engineering applications.

This glass is chemically resistant, has a low thermal expansion coefficient and can be used at relatively high temperatures. It is available in many forms and sizes such as rod, tube, plate and as machined or hot formed components.



Dielectric constant εr

4.6 [-] at 20 °C

Dielectric strength EDS

30 kV/mm at 20 °C

Electrical resistivity ρel

1.00E+13 Ω·m at 20 °C


Density ρ

2.23 g/cm³ at 20 °C


Elastic modulus E

64 GPa at 20 °C


Coefficient of thermal expansion α

3.3E-6 1/K at 20 °C

Max service temperature Tmax

500 °C

Thermal conductivity λ

1.14 W/(m·K) at 20 °C

This material data has been provided by Goodfellow.

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.