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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.

Properties

General

Density

ρ

2.25 g/cm³ at 20 °C

Thermal

Annealing temperature

Tanneal

560 °C

Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

α

3.8E-6 1/K at 20 °C

mean value for 20-300 °C - ISO 7991

Glass transition temperature

Tg

510 °C

ISO 7884-8

Softening temperature

Tsoftening

800 °C

Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Specific electrical resistance temperature

Tk

265 °C

For ρ = 10⁸ Ω·cm

Working temperature

Tworking

1210 °C

Viscosity 10⁴ dPa.s (ISO 7884-2)

Optical

Refractive index

nd

1.48 [-]

at λ=587.6 nm

Technological properties

Application areas

Transmitter and x-ray tubes, other Electrotechnology/Electronics

Corrosion properties

Hydrolytic resistance Class HGB1 (ISO 719)

Do you need more data regarding this material?

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.