Borosilicate Glass SCHOTT GS20

Alternative and trade names
SCHOTT GS20
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Description

Sealing glasses in general.

Properties

General

Density

ρ

2.22 g/cm³ at 20 °C

Thermal

Annealing temperature

Tanneal

730 °C

Viscosity 10¹³·² dPa.s (ISO 7884-4)

Coefficient of thermal expansion

α

1.9E-6 1/K at 20 °C

mean value for 20-300 °C - ISO 7991

Softening temperature

Tsoftening

1175 °C

Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Specific electrical resistance temperature

Tk

465 °C

For ρ = 10⁸ Ω·cm

Strain temperature

Tstrain

645 °C

Viscosity 10¹⁴·⁷ dPa.s (ISO 7884-4)

Working temperature

Tworking

1680 °C

Viscosity 10⁴ dPa.s (ISO 7884-3)

Electrical

Electrical resistivity

ρel

1.26E+9 Ω·m at 250 °C

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Chemical properties

Element

Weight %

Comment

Si

81 %

SiO₂

B

11 %

B₂O₃

Al

5 %

Al₂O₃

Ba

2 %

BaO

Fe

0.1 %

max., Fe₂O₃

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Technological properties

Application areas

Electronic Components, Signal intensifier, detector and (fibre-) optics (other Electrotechnology/Electronics).

This material data has been provided by Schott Glass Tubing.

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.