Lead Glass SCHOTT 8531
SCHOTT 8531
Description
Soft glass, free from sodium, of high lead content. High hydrolytic resistance and electrically high insulating.
Ashby charts
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Properties
General
Density
ρ4.31 g/cm³ at 20 °C
Mechanical
Thermal
Annealing temperature
Tanneal430 °C
Viscosity 10¹³ dPa.s (ISO 7884-4)
Coefficient of thermal expansion
α9.1E-6 1/K at 20 °C
mean value for 20-300 °C - ISO 7991
Glass transition temperature
Tg435 °C
ISO 7884-8
Softening temperature
Tsoftening585 °C
Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)
Specific electrical resistance temperature
Tk450 °C
For ρ = 10⁸ Ω·cm
Thermal conductivity
λ0.7 W/(m·K) at 90 °C
Working temperature
Tworking820 °C
Viscosity 10⁴ dPa.s (ISO 7884-2)
Electrical
Dielectric constant, 1MHz
εr,1MHz9.5 [-] at 20 °C
Electrical resistivity
ρel1.00E+9 Ω·m at 250 °C
Loss tangent, 1MHz
tanδ1,MHz9E-4 [-] at 20 °C
Optical
Refractive index
nd1.7 [-]
at λ=587.6 nm
Stress optical coefficient
k2.2E-6 mm²/N
DIN 52314
Technological properties
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)
This material data has been provided by Schott Glass Tubing.
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.
