Bubble Alumina

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Description

GNPGraystar’s Bubble Alumina is produced by fusing special high purity alumina. The melt is atomized with compressed air which leads to the hollow spheres.


Bubble Aumina is hard but extremely friable with respect to its pressure strength. The melting point is approximately 2100°C. Due to its hollow spheres, it has a low bulk density and extremely low thermal conductivity. Bubble Alumina is chemically inert.

Diese Materialdaten wurden von GNPGraystar Specialty Materials zur Verfügung gestellt

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Ashby charts

Eigenschaften

Allgemein

PropertyValueComment

Partikelgrößenbereich

2000.0 µm

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Schüttdichte

0.65 - 1.1 g/cm³

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depending on the size, refer to the table below

Thermisch

PropertyValue

Schmelzpunkt

2100.0 °C

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Chemical properties

PropertyValueComment

Aluminium

98.8 %

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Al₂O₃

Eisen

0.04

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Fe₂O₃

Kalzium

0.03

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CaO

Magnesium

0.08

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Natrium

0.09

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Na₂O

Silizium

0.8

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SiO₂

Technological properties

Property
Application areas

Due to the above noted properties, Bubble Alumina is used in lightweight, high temperature refractories to form pores in high-porosity abrasives, and as a media to filtrate aggressive liquids or melts. It can also be used as a bed materials in the firing process of vitirified grinding wheels and other ceramic parts.

Color

White

Crystal structure

Alpha-Alumina

Other

Available Sizes & Typical Bulk Densities:


SizeBulk Density (g/l)Bulk Density (lb/ft²)
0 - 0.5 mm800 - 1,10050 - 70
0.5 - 1 mm650 - 85040 - 53
0 - 1 mm700 - 1,05044 - 66
0 - 2 mm650 - 1,00040 - 63