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Aluminosilicate Glass SCHOTT 8252
SCHOTT 8252
Description
Alkaline earth aluminosilicate glass for high temperature applications in electrical engineering, for sealing to molybdenum, free from alkali. Electrically highly insulating, high hydrolytic resistance, high resistance to thermal shock and high temperature resistance.
Ashby charts
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Properties
General
Density
ρ2.63 g/cm³ at 20 °C
Mechanical
Elastic modulus
E81 GPa at 20 °C
Poisson's ratio
ν0.24 [-] at 20 °C
Thermal
Annealing temperature
Tanneal725 °C
Viscosity 10¹³ dPa.s (ISO 7884-4)
Coefficient of thermal expansion
α4.6E-6 1/K at 20 °C
mean value for 20-300 °C - ISO 7991
Glass transition temperature
Tg720 °C
ISO 7884-8
Softening temperature
Tsoftening935 °C
Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)
Specific electrical resistance temperature
Tk660 °C
For ρ = 10⁸ Ω·cm
Strain temperature
Tstrain670 °C
Viscosity 10¹⁴·⁵ dPa.s (ISO 7884-7)
Thermal conductivity
λ1.1 W/(m·K) at 90 °C
Working temperature
Tworking1240 °C
Viscosity 10⁴ dPa.s (ISO 7884-2)
Electrical
Dielectric constant, 1MHz
εr,1MHz6.1 [-] at 20 °C
Electrical resistivity
ρel1.00E+10 Ω·m at 350 °C
Loss tangent, 1MHz
tanδ1,MHz1.1E-3 [-] at 20 °C
Optical
Refractive index
nd1.54 [-]
at λ=587.6 nm
Stress optical coefficient
k2.8E-6 mm²/N
DIN 52314
UV transmission
tUV58 %
max., Thickness=1 mm, λ=330 nm
Chemical properties
Element
Weight %
Comment
0.01 %
max., Lead, Cadmium, Mercury and Hexavalent Chromium
Technological properties
Application areas
For high temperature applications in electrical engineering. For use in bulb and exhaust tube, for halogen lamps for automotive, houshold, general lighting and Exterior lighting
Corrosion properties
Hydrolytic resistance Class HGB1 (ISO 719) - Acid resistance Class S3 (DIN 12116) - Alkali resistance Class A2 (ISO695)
Do you need more data regarding this material?
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.
