Aluminosilicate Glass SCHOTT 8253

Alternative and trade names
SCHOTT 8253
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Description

Alkaline earth aluminosilicate glass for high temperature application in electrical engineering, for sealing to molybdenum, for use at higher temperatures than glass 8252 and free from alkali. Electrically highly insulating, high hydrolytic resistance, high resistance to thermal shock and high temperature resistance.

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.

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Properties

General

PropertyTemperatureValue

Density

23.0 °C

2.67 g/cm³

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Mechanical

PropertyTemperatureValue

Elastic modulus

23.0 °C

83 GPa

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Poisson's ratio

23.0 °C

0.23 [-]

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Thermal

PropertyTemperatureValueComment

Annealing temperature

795 °C

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Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

23.0 °C

4.7E-6 1/K

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mean value for 20-300 °C - ISO 7991

Glass transition temperature

790 °C

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ISO 7884-8

Softening temperature

1005 °C

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Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Specific electrical resistance temperature

630 °C

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For ρ = 10⁸ Ω·cm

Strain temperature

750 °C

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Viscosity 10¹⁴·⁵ dPa.s (ISO 7884-7)

Thermal conductivity

90.0 °C

1.1 W/(m·K)

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Working temperature

1305 °C

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Viscosity 10⁴ dPa.s (ISO 7884-2)

Electrical

PropertyTemperatureValue

Dielectric constant, 1MHz

23.0 °C

6.6 [-]

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Electrical resistivity

250.0 °C

1.00E+11 Ω·m

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350.0 °C

1.00E+9 Ω·m

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Loss tangent, 1MHz

23.0 °C

1.5E-3 [-]

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Optical

PropertyValueComment

Refractive index

1.55 [-]

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at λ=587.6 nm

Stress optical coefficient

2.7E-6 mm²/N

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DIN 52314

UV transmission

72 %

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max., Thickness=1 mm, λ=330 nm

Chemical properties

PropertyValueComment

Other

0.01 %

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max., Lead, Cadmium, Mercury and Hexavalent Chromium

Technological properties

Property
Application areas

For high temperature applications in electrical engineering. For use in bulb and exhaust tube, for halogen lamps for automotive, houshold, general lighting and Exterior lighting

Corrosion properties

Hydrolytic resistance Class HGB1 (ISO 719) - Acid resistance Class S2 (DIN 12116) - Alkali resistance Class A2 (ISO695)