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Borosilicate Glass CONTURAX®

Alternative and trade names
CONTURAX®
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Description

Borosilicate glass tubing and rod, varying types of inner and outer shapes. It exhibits high chemical resistance, high hydrolytic resistance and high resistance to thermal shock.

Ashby charts

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Properties

General

Density

ρ

2.23 g/cm³ at 20 °C

Mechanical

Elastic modulus

E

63 GPa at 20 °C

Poisson's ratio

ν

0.2 [-] at 20 °C

Thermal

Annealing temperature

Tanneal

560 °C

Viscosity 10¹³ dPa.s (ISO 7884-4)

Coefficient of thermal expansion

α

3.3E-6 1/K at 20 °C

mean value for 20-300 °C - ISO 7991

Glass transition temperature

Tg

525 °C

ISO 7884-8

Softening temperature

Tsoftening

825 °C

Viscosity 10⁷·⁶ dPa.s (ISO 7884-3)

Specific electrical resistance temperature

Tk

250 °C

For ρ = 10⁸ Ω·cm

Thermal conductivity

λ

1.2 W/(m·K) at 90 °C

Working temperature

Tworking

1260 °C

Viscosity 10⁴ dPa.s (ISO 7884-2)

Electrical

Dielectric constant, 1MHz

εr,1MHz

4.6 [-] at 20 °C

Electrical resistivity

ρel

1000000 Ω·m at 250 °C

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Loss tangent, 1MHz

tanδ1,MHz

3.7E-3 [-] at 20 °C

Optical

Refractive index

nd

1.47 [-]

at λ=587.6 nm

Stress optical coefficient

k

4E-6 mm²/N

DIN 52314

Chemical properties

Element

Weight %

Comment

Other

0.01 %

max., Lead, Cadmium, Mercury and Hexavalent Chromium

Technological properties

Application areas

Engineering (Glass apparatus), Renewable energies (Receiver), Home (Furniture, Architecture, Partition walls, Giftware and others), Lighting (Neon tubing, Safe lighting, ), Laboratory/Industrial Technology (Glassblown laboratory ware, Pressed glass articles like balls and lenses, Technical articles), Sprinkler, Art installations

Corrosion properties

Hydrolytic resistance Class HGB1 (ISO 719) - Acid resistance Class S1 (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.

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.