Borosilicate Glass SCHOTT 8447

Alternative and trade names
SCHOTT 8447
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Description

Intermediate sealing glass to the glasses FIOLAX® clear, 8449, 8486, 8412, 8250, 8245 and Kovar.

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

2.26 g/cm³

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Thermal

PropertyTemperatureValueComment

Annealing temperature

505 °C

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Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

23.0 °C

4.6E-6 1/K

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mean value for 20-300 °C - ISO 7991

Glass transition temperature

475 °C

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ISO 7884-8

Softening temperature

720 °C

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Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Specific electrical resistance temperature

270 °C

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For ρ = 10⁸ Ω·cm

Working temperature

1045 °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

Technological properties

Property
Application areas

Transmitter and x-ray tubes, other Electrotechnology/Electronics

Corrosion properties

Hydrolytic resistance Class HGB4 (ISO 719)