Borosilicate Glass Tubing and Rod DURAN®

Alternative and trade names
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Borosilicate glass 3.3 acc. to ISO 3585. It exhibits high chemical resistance, high hydrolytic resistance, high resistance to thermal shock, high temperature resistance, electrically highly insulating and high transmittance. DURAN® is a registered trademark of DWK Life Sciences GmbH.

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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2.23 g/cm³

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Elastic modulus

63 GPa

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Poisson's ratio

0.2 [-]

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PropertyTemperatureValueTesting StandardComment

Annealing temperature

560.0 °C

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ISO 7884-4

Viscosity 10¹³ dPa·s

Coefficient of thermal expansion

3.3e-06 1/K

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ISO 7991

mean value for 20-300 °C

Glass transition temperature

525 °C

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ISO 7884-8

Softening temperature

825.0 °C

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ISO 7884-3

Viscosity 10⁷·⁶ dPa·s

Specific electrical resistance temperature

250.0 °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

1260.0 °C

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ISO 7884-2

Viscosity 10⁴ dPa·s



Dielectric constant

4.6 [-]

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Electrical resistivity

250 °C

1e+06 Ω·m

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350 °C

31623 Ω·m

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Loss tangent

0.0037 [-]

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PropertyValueTesting StandardComment

Refractive index

1.5 [-]

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at λ=587.6 nm

Stress optical coefficient

4e-06 mm²/N

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DIN 52314

Chemical properties



0.01 %

max., Lead, Cadmium, Mercury and Hexavalent Chromium

Technological properties

Application areas

Engineering (Heat exchanger, Desulphorization plants, Ozone generators, Photobioreactors, Instruments / Barometers / Aerometers / Sightglasses), Electronic components (Fuses), Signal intensifier, detector and (fibre-) optics (Transmitter and x-ray tubes, Photomultipliers), Sensors, Home (Aquarium heating tubes, Furniture, Sprinkler fuses, Food packaging/cosmetics, Architecture, Galileo thermometers, Outdoor patio heater, Christmas ornameters, Handle for cups, Partition walls and Giftware), Lighting (Explosion proof lighting, Neon tubing, Flah lamps, Lamp bulbs, Exhaust and plate tubing, Safety lighting, Autonomous street lighting), Laboratory/Industrial Technology (Glassblown laboratory ware, Test tubes, NMR tubes, Measuring cylinders, Microlitetre, Syringe, Pipettes, Thermometry, Glass Straws, Pressed glass articles like balls and lenses, Technical articles), General-purpose glass for apparatus for the chemical industry, Sight- and Gauge glasses, pipelines and lab glassware, Sprinkler, Art installations, LiDAR & Radar, Pneumatic Conveying Systems, Photobioreactors, Water treatment,

Corrosion properties

Hydrolytic resistance Class HGB1 (ISO 719) - Acid resistance Class S1 (DIN 12116) - Alkali resistance Class A2 (ISO695)