Borosilicate Glass SCHOTT 8660

Alternative and trade names
SCHOTT 8660
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Description

For sealing to tungsten, of high cesium content. High resistance to thermal shock and a longer life in comparison with glass 8487.

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

2.44 g/cm³

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

23.0 °C

4.1E-6 1/K

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mean value for 20-300 °C - ISO 7991

Glass transition temperature

550 °C

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ISO 7884-8

Softening temperature

830 °C

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Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Specific electrical resistance temperature

550 °C

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For ρ = 10⁸ Ω·cm

Working temperature

1215 °C

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Viscosity 10⁴ dPa.s (ISO 7884-2)

Electrical

PropertyTemperatureValue

Electrical resistivity

250.0 °C

5.01E+10 Ω·m

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350.0 °C

5.01E+8 Ω·m

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Optical

PropertyValueComment

Refractive index

1.49 [-]

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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

Red eye reduction flash for electronic flashbulbs and lighting, Camera- and Video components, Digital projection

Corrosion properties

Hydrolytic resistance Class HGB3 (ISO 719) - Acid resistance Class S3 (DIN 12116) - Alkali resistance Class A3 (ISO695)