Aluminosilicate Glass Tubing and Rod SCHOTT NEO1730

Alternative and trade names
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Alkaline earth neodymium containing, violet colour aluminosilicate glass for high temperature applications in electrical engineering. High resistance to thermal shock, high hydrolytic resistance, for sealing to molybdenum and free from alkali.

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.

Ashby charts





2.67 g/cm³

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PropertyValueTesting StandardComment

Annealing temperature

725.0 °C

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ISO 7884-4

Viscosity 10¹³ dPa·s

Coefficient of thermal expansion

4.5e-06 1/K

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ISO 7991

mean value for 20-300 °C

Glass transition temperature

715 °C

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ISO 7884-8

Softening temperature

935.0 °C

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ISO 7884-3

Viscosity 10⁷·⁶ dPa·s

Strain temperature

675 °C

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ISO 7884-7

Viscosity 10¹⁴·⁵ dPa·s

Working temperature

1210.0 °C

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ISO 7884-2

Viscosity 10⁴ dPa·s



Refractive index

1.5 [-]

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at λ=587.6 nm


37 %

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Thickness=1 mm | λ=585 nm

UV transmission

58 %

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Thickness=1 mm | λ=330 nm

Chemical properties



0.01 %

max., Lead, Cadmium, Mercury and Hexavalent Chromium

Technological properties

Application areas

Bulb and exhaust tube for halogen lamps for automotive, household and general lighting.

Corrosion properties

Hydrolytic resistance Class HGB1 (ISO 719) - Acid resistance Class S3 (DIN 12116) - Alkali resistance Class A2 (ISO695)