Borosilicate Glass SCHOTT 8448

Alternative and trade names
SCHOTT 8448
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Description

Intermediate sealing glass to the glasses DURAN®, 8330, 8449, 8486, 8487 and tungsten.

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

2.25 g/cm³

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Thermal

PropertyTemperatureValueComment

Annealing temperature

560 °C

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Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

23.0 °C

3.8E-6 1/K

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mean value for 20-300 °C - ISO 7991

Glass transition temperature

510 °C

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ISO 7884-8

Softening temperature

800 °C

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Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Specific electrical resistance temperature

265 °C

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For ρ = 10⁸ Ω·cm

Working temperature

1210 °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 HGB1 (ISO 719)