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.

Properties

General

Density ρ

2.27 g/cm³ at 20 °C

Mechanical

Elastic modulus E

64 GPa at 20 °C

Poisson's ratio ν

0.21 [-] at 20 °C

Thermal

Annealing temperature Tanneal

505 °C

Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion α

5E-6 1/K at 20 °C

mean value for 20-300 °C - ISO 7991

Glass transition temperature Tg

490 °C

ISO 7884-8

Softening temperature Tsoftening

705 °C

Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Specific electrical resistance temperature Tk

377 °C

For ρ = 10⁸ Ω·cm

Thermal conductivity λ

1.2 W/(m·K) at 90 °C

Working temperature Tworking

1040 °C

Viscosity 10⁴ dPa.s (ISO 7884-2)

Electrical

Dielectric constant, 1MHz εr,1MHz

5.3 [-] at 20 °C

Electrical resistivity ρel

2.00E+8 Ω·m at 250 °C

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Loss tangent, 1MHz tanδ1,MHz

0.01 [-] at 20 °C

Optical

Refractive index nd

1.49 [-]

at λ=587.6 nm

Stress optical coefficient k

3.6E-6 mm²/N

DIN 52314

Chemical properties

Element

Weight %

Comment

Other

0.01 %

max., Lead, Cadmium, Mercury and Hexavalent Chromium

Technological properties

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)

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.