Borosilicate Glass SCHOTT GS25

Alternative and trade names
SCHOTT GS25
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Description

Sealing glasses in general.

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.

Ashby charts

Properties

General

PropertyTemperatureValue

Density

23.0 °C

2.21 g/cm³

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Thermal

PropertyTemperatureValueComment

Annealing temperature

635 °C

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Viscosity 10¹³·² dPa.s (ISO 7884-4)

Coefficient of thermal expansion

23.0 °C

2.65E-6 1/K

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mean value for 20-300 °C - ISO 7991

Softening temperature

1055 °C

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Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Specific electrical resistance temperature

440 °C

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For ρ = 10⁸ Ω·cm

Strain temperature

565 °C

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Viscosity 10¹⁴·⁷ dPa.s (ISO 7884-4)

Working temperature

1605 °C

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Viscosity 10⁴ dPa.s (ISO 7884-3)

Electrical

PropertyTemperatureValue

Electrical resistivity

250.0 °C

5.01E+8 Ω·m

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350.0 °C

1.00E+7 Ω·m

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Chemical properties

PropertyValueComment

Aluminium

5 %

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Al₂O₃

Barium

2 %

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BaO

Boron

11 %

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B₂O₃

Calcium

1 %

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CaO

Iron

0.1 %

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max., Fe₂O₃

Other

0.01 %

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max., Lead, Cadmium, Mercury and Hexavalent Chromium

Potassium

2 %

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K₂O

Silicon

79 %

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SiO₂

Technological properties

Property
Application areas

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