Borosilicate Glass Tubing and Rod SCHOTT 8270

Alternative and trade names
SCHOTT 8270
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Description

For sealing to kovar metal and molybdenum. Electrically highly insulating, UV-Block and stabilized gainst solarisation.

This material data has been provided by Schott Glass Tubing.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
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.

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Properties

General

PropertyValue

Density

2.27 g/cm³

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Mechanical

PropertyValue

Elastic modulus

64 GPa

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Poisson's ratio

0.21 [-]

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Thermal

PropertyTemperatureValueTesting StandardComment

Annealing temperature

505.0 °C

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ISO 7884-4

Viscosity 10¹³ dPa·s

Coefficient of thermal expansion

5e-06 1/K

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ISO 7991

mean value for 20-300 °C

Glass transition temperature

490 °C

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ISO 7884-8

Softening temperature

705.0 °C

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ISO 7884-3

Viscosity 10⁷·⁶ dPa·s

Specific electrical resistance temperature

377.0 °C

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For ρ=10⁸ Ω·cm

Thermal conductivity

90 °C

1.2 W/(m·K)

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Working temperature

1040.0 °C

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ISO 7884-2

Viscosity 10⁴ dPa·s

Electrical

PropertyTemperatureValueFrequency

Dielectric constant

5.3 [-]

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1MHz

Electrical resistivity

250 °C

2e+08 Ω·m

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350 °C

2.51e+06 Ω·m

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Loss tangent

0.0127 [-]

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1MHz

Optical

PropertyValueTesting StandardComment

Refractive index

1.5 [-]

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at λ=587.6 nm

Stress optical coefficient

3.6e-06 mm²/N

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DIN 52314

Chemical properties

Property

Other

0.01 %

max., Lead, Cadmium, Mercury and Hexavalent Chromium

Technological properties

Property
Application areas

For use in display technology (Backlighting and beads).

Corrosion properties

Hydrolytic resistance Class HGB3 (ISO 719) - Acid resistance Class S4 (DIN 12116) - Alkali resistance Class A3 (ISO695)