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.

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Properties

General

Density

ρ

3.57 g/cm³ at 20 °C

Mechanical

Elastic modulus

E

62 GPa at 20 °C

Show Lead Glass materials with Elastic modulus of 62 GPa at 20 °C

Poisson's ratio

ν

0.23 [-] at 20 °C

Show Lead Glass materials with Poisson's ratio of 0.23 [-] at 20 °C

Thermal

Annealing temperature

Tanneal

475 °C

Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

α

5.1E-6 1/K at 20 °C

mean value for 20-300 °C - ISO 7991

Glass transition temperature

Tg

475 °C

ISO 7884-8

Softening temperature

Tsoftening

625 °C

Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Thermal conductivity

λ

0.5 W/(m·K) at 90 °C

Working temperature

Tworking

885 °C

Viscosity 10⁴ dPa.s (ISO 7884-2)

Electrical

Dielectric constant, 1MHz

εr,1MHz

7.6 [-] at 20 °C

Loss tangent, 1MHz

tanδ1,MHz

3.3E-3 [-] at 20 °C

Optical

Refractive index

nd

1.62 [-]

at λ=587.6 nm

Stress optical coefficient

k

2.8E-6 mm²/N

DIN 52314

Technological properties

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)

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.