Borosilicate Glass SCHOTT 8228

Alternative and trade names
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Intermediate sealing glass for sealing to quartz glass and glass 8229 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





2.15 g/cm³

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20.0 °C



Annealing temperature

700 °C

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Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

1.3E-6 1/K

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20.0 °C

mean value for 20-300 °C - ISO 7991

Glass transition temperature

700 °C

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ISO 7884-8

Softening temperature

1135 °C

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Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Working temperature

1665 °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