SCHOTT 8689

Alternative and trade names
SCHOTT 8689
.XLSX
.PDF
Save

Description

Highly UV-blocked, stabilised against solarisation and sealing glass to tungsten.

Properties

General

Density ρ

2.27 g/cm³ at 20 °C

Mechanical

Elastic modulus E

65 GPa at 20 °C

Poisson's ratio ν

0.2 [-] at 20 °C

Thermal

Annealing temperature Tanneal

565 °C

Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion α

3.8E-6 1/K at 20 °C

mean value for 20-300 °C - ISO 7991

Glass transition temperature Tg

515 °C

ISO 7884-8

Softening temperature Tsoftening

770 °C

Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Specific electrical resistance temperature Tk

314 °C

For ρ = 10⁸ Ω·cm

Thermal conductivity λ

1.2 W/(m·K) at 90 °C

Working temperature Tworking

1110 °C

Viscosity 10⁴ dPa.s (ISO 7884-2)

Electrical

Dielectric constant, 1MHz εr,1MHz

5 [-] at 20 °C

Electrical resistivity ρel

1.26E+7 Ω·m at 250 °C

Show chart

Loss tangent, 1MHz tanδ1,MHz

2E-3 [-] at 20 °C

Optical

Refractive index nd

1.5 [-]

at λ=587.6 nm

Stress optical coefficient k

3.9E-6 mm²/N

DIN 52314

Chemical properties

Element

Weight %

Comment

Other

0.01 %

max., Lead, Cadmium, Mercury and Hexavalent Chromium

Technological properties

Application areas

Display technology (Backlighting).

Corrosion properties

Hydrolytic resistance Class HGB3 (ISO 719) - Acid resistance Class S3 (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.