Lead Glass SCHOTT 8531

Alternative and trade names
SCHOTT 8531
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Description

Soft glass, free from sodium, of high lead content. High hydrolytic resistance and electrically high insulating.

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

PropertyValue

Density

4.31 g/cm³

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Mechanical

PropertyValue

Elastic modulus

52 GPa

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Poisson's ratio

0.24 [-]

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Thermal

PropertyTemperatureValueTesting StandardComment

Annealing temperature

430.0 °C

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ISO 7884-4

Viscosity 10¹³ dPa·s

Coefficient of thermal expansion

9.1e-06 1/K

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ISO 7991

mean value for 20-300 °C

Glass transition temperature

435 °C

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ISO 7884-8

Softening temperature

585.0 °C

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ISO 7884-3

Viscosity 10⁷·⁶ dPa·s

Specific electrical resistance temperature

450.0 °C

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For ρ=10⁸ Ω·cm

Thermal conductivity

90 °C

0.7 W/(m·K)

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Working temperature

820.0 °C

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ISO 7884-2

Viscosity 10⁴ dPa·s

Electrical

PropertyTemperatureValueFrequency

Dielectric constant

9.5 [-]

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1MHz

Electrical resistivity

250 °C

1e+09 Ω·m

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350 °C

6.31e+07 Ω·m

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Loss tangent

0.0009 [-]

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1MHz

Optical

PropertyValueTesting StandardComment

Refractive index

1.7 [-]

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at λ=587.6 nm

Stress optical coefficient

2.2e-06 mm²/N

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DIN 52314

Technological properties

Property
Application areas

Encapsulation of semiconductor components at low temperature (Microdiodes), Electronics, Sensors

Corrosion properties

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