Borosilicate Glass SCHOTT 8242

Alternative and trade names
SCHOTT 8242
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Description

For sealing to kovar metal and molybdenum. Electrically highly insulating.

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

2.27 g/cm³

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Thermal

PropertyTemperatureValueComment

Annealing temperature

480 °C

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Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

23.0 °C

4.7E-6 1/K

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mean value for 20-300 °C - ISO 7991

Glass transition temperature

465 °C

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ISO 7884-8

Softening temperature

715 °C

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Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Working temperature

1130 °C

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Viscosity 10⁴ dPa.s (ISO 7884-2)

Optical

PropertyValueComment

Refractive index

1.48 [-]

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at λ=587.6 nm

Chemical properties

PropertyValueComment

Other

0.01 %

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max., Lead, Cadmium, Mercury and Hexavalent Chromium

Technological properties

Property
Application areas

For use in clad tube for optical fibers, Endoscopy

Corrosion properties

Hydrolytic resistance Class HGB2 (ISO 719) - Acid resistance Class S4 (DIN 12116) - Alkali resistance Class A3 (ISO695)