Borosilicate Glass Tubing and Rod SCHOTT 8448

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

This material data has been provided by Schott Glass Tubing.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
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





2.25 g/cm³

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PropertyValueTesting StandardComment

Annealing temperature

560.0 °C

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ISO 7884-4

Viscosity 10¹³ dPa·s

Coefficient of thermal expansion

3.8e-06 1/K

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ISO 7991

mean value for 20-300 °C

Glass transition temperature

510 °C

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ISO 7884-8

Softening temperature

800.0 °C

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ISO 7884-3

Viscosity 10⁷·⁶ dPa·s

Specific electrical resistance temperature

265.0 °C

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For ρ=10⁸ Ω·cm

Working temperature

1210.0 °C

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ISO 7884-2

Viscosity 10⁴ dPa·s



Refractive index

1.5 [-]

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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)