Lead Glass SCHOTT 8652

Alternative and trade names
SCHOTT 8652
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Description

Tungsten sealing glass. Low melting passivation glass wit 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

3.18 g/cm³

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Mechanical

PropertyTemperatureValue

Elastic modulus

23.0 °C

58 GPa

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Poisson's ratio

23.0 °C

0.25 [-]

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Thermal

PropertyTemperatureValueComment

Annealing temperature

490 °C

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Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

23.0 °C

4.5E-6 1/K

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mean value for 20-300 °C - ISO 7991

Glass transition temperature

495 °C

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ISO 7884-8

Softening temperature

638 °C

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Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Thermal conductivity

90.0 °C

0.9 W/(m·K)

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Working temperature

900 °C

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Viscosity 10⁴ dPa.s (ISO 7884-2)

Electrical

PropertyTemperatureValue

Dielectric constant, 1MHz

23.0 °C

6.9 [-]

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Loss tangent, 1MHz

23.0 °C

3.5E-3 [-]

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Optical

PropertyValueComment

Refractive index

1.59 [-]

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at λ=587.6 nm

Stress optical coefficient

3.4E-6 mm²/N

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DIN 52314

Technological properties

Property
Application areas

For power and pin diodes as well as microdiodes, Signal intensifier, detector (other Electrotechnology/Electronics), Sensors

Corrosion properties

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