Aluminosilicate Glass Tubing and Rod SCHOTT 8252

Nombres alternativos y comerciales
SCHOTT 8252
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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.

Los datos sobre este material han sido proporcionados por Schott Glass Tubing.

A menos que se indique lo contrario, todas las medidas corresponden a condiciones de temperatura ambiente. A menos que se indique lo contrario, se utilizan las unidades del SI.
Las normas armonizadas son similares a uno o varios estándares del proveedor. Es posible que algunas normas armonizadas se ajusten al estándar original, mientras que otras pueden quedar fuera de su alcance.

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Propiedades

General

PropertyValue

Densidad

2.63 g/cm³

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Mecánica

PropertyValue

Coeficiente de Poisson

0.24 [-]

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Módulo elástico

81 GPa

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Aplicaciones térmicas

PropertyTemperatureValueTesting StandardComment

Coeficiente de dilatación térmica

4.6e-06 1/K

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ISO 7991

mean value for 20-300 °C

Conductividad térmica

90 °C

1.1 W/(m·K)

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Softening temperature

935.0 °C

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ISO 7884-3

Viscosity 10⁷·⁶ dPa·s

Specific electrical resistance temperature

660.0 °C

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For ρ=10⁸ Ω·cm

Temperatura de deformación

670 °C

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ISO 7884-7

Viscosity 10¹⁴·⁵ dPa·s

Temperatura de recocido

725.0 °C

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ISO 7884-4

Viscosity 10¹³ dPa·s

Temperatura de transición del vidrio

720 °C

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ISO 7884-8

Working temperature

1240.0 °C

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ISO 7884-2

Viscosity 10⁴ dPa·s

Eléctrico

PropertyTemperatureValueFrequency

Constante dieléctrica

6.1 [-]

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1MHz

Resistividad eléctrica

350 °C

1e+10 Ω·m

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Tangente de pérdidas

0.0011 [-]

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1MHz

Óptico

PropertyValueTesting StandardComment

Stress optical coefficient

2.8e-06 mm²/N

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DIN 52314

UV transmission

58 %

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max. | Thickness=1 mm | λ=330 nm

Índice de refracción

1.5 [-]

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at λ=587.6 nm

Chemical properties

Property

Other

0.01 %

max., Lead, Cadmium, Mercury and Hexavalent Chromium

Technological properties

Property
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)