Lead Glass SCHOTT 8650

Alternative and trade names
SCHOTT 8650
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Description

Passivation glass, sealing glass for molybdenum, free from Na and K, of high lead content, high hydrolytic 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

3.57 g/cm³

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Mechanical

PropertyTemperatureValue

Elastic modulus

23.0 °C

62 GPa

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Poisson's ratio

23.0 °C

0.23 [-]

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Thermal

PropertyTemperatureValueComment

Annealing temperature

475 °C

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Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

23.0 °C

5.1E-6 1/K

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mean value for 20-300 °C - ISO 7991

Glass transition temperature

475 °C

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ISO 7884-8

Softening temperature

625 °C

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Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Thermal conductivity

90.0 °C

0.5 W/(m·K)

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Working temperature

885 °C

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Viscosity 10⁴ dPa.s (ISO 7884-2)

Electrical

PropertyTemperatureValue

Dielectric constant, 1MHz

23.0 °C

7.6 [-]

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Loss tangent, 1MHz

23.0 °C

3.3E-3 [-]

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Optical

PropertyValueComment

Refractive index

1.62 [-]

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at λ=587.6 nm

Stress optical coefficient

2.8E-6 mm²/N

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DIN 52314

Technological properties

Property
Application areas

Implosion diodes, Electronics and Sensors

Corrosion properties

Hydrolytic resistance Class HGB1 (ISO 719) - Acid resistance Class S4 (DIN 12116) - Alkali resistance Class A3 (ISO695)