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.

This material data has been provided by GNPGraystar Specialty Materials.

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

Properties

General

PropertyValueComment

Bulk density

0.65 - 1.1 g/cm³

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depending on the size, refer to the table below

Particle size range

2000.0 µm

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Thermal

PropertyValue

Melting point

2100.0 °C

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Chemical properties

PropertyValueComment

Aluminium

98.8 %

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Al₂O₃

Calcium

0.03

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CaO

Iron

0.04

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Fe₂O₃

Magnesium

0.08

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Silicon

0.8

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SiO₂

Sodium

0.09

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Na₂O

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