Lead Glass SCHOTT 8651

Alternative and trade names
SCHOTT 8651
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Description

Passivation glass, tungsten sealing glass, Electrically highly insulating with high hydrolytic resistance.

Ashby charts

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Properties

General

Density

ρ

2.91 g/cm³ at 20 °C

Mechanical

Elastic modulus

E

59 GPa at 20 °C

Show Lead Glass materials with Elastic modulus of 59 GPa at 20 °C

Poisson's ratio

ν

0.24 [-] at 20 °C

Show Lead Glass materials with Poisson's ratio of 0.24 [-] at 20 °C

Thermal

Annealing temperature

Tanneal

540 °C

Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

α

4.4E-6 1/K at 20 °C

mean value for 20-300 °C - ISO 7991

Glass transition temperature

Tg

549 °C

ISO 7884-8

Softening temperature

Tsoftening

736 °C

Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Thermal conductivity

λ

0.9 W/(m·K) at 90 °C

Working temperature

Tworking

1034 °C

Viscosity 10⁴ dPa.s (ISO 7884-2)

Electrical

Dielectric constant, 1MHz

εr,1MHz

6 [-] at 20 °C

Electrical resistivity

ρel

1.58E+9 Ω·m at 250 °C

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Loss tangent, 1MHz

tanδ1,MHz

3.1E-3 [-] at 20 °C

Optical

Refractive index

nd

1.55 [-]

at λ=587.6 nm

Stress optical coefficient

k

3.6E-6 mm²/N

DIN 52314

Technological properties

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)

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.