Borosilicate Glass SCHOTT 8229

Alternative and trade names
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Intermediate sealing glass for sealing to Glass 8228 and Glass 8230 with high resistance to thermal shock.

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





2.17 g/cm³

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20.0 °C



Annealing temperature

637 °C

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Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

2E-6 1/K

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20.0 °C

mean value for 20-300 °C - ISO 7991

Glass transition temperature

600 °C

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ISO 7884-8

Softening temperature

930 °C

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Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Specific electrical resistance temperature

350 °C

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For ρ = 10⁸ Ω·cm

Working temperature

1440 °C

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Viscosity 10⁴ dPa.s (ISO 7884-2)

Chemical properties



0.01 %

max., Lead, Cadmium, Mercury and Hexavalent Chromium

Technological properties

Application areas

For use in electrotechnology (Signal intensifier, Detector) and lighting (Flash lights), Camera- and Video components, Digital projection, Photodynamic Therapy, Beauty and Cosmetics