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AC3490 Bubble Alumina

  • Catalog No. AC3490
  • Material Al2O3
  • Purity 98.8%
  • Size 0.1-5mm

Bubble Alumina Description

Bubble Alumina is produced by atomizing melted high-purity alumina. The atomized particles form hollow spheres. Bubble Alumina, by nature of its structure, has very low thermal conductivity and low bulk density. While Bubble Alumina exhibits a bulk density twice that of a premium-grade alumina fiber insulator. Bubble Alumina’s structure consists primarily of closed air-filled thin-walled cells that combine to give it exceptional hot strength and low thermal conductivity. This makes Bubble Alumina an effective high-temperature thermal insulator in structural applications where insulating capabilities cannot be sacrificed and appropriate for use at temperatures as high as 1825°C. It is pre-fired, contains no organics, and exhibits high microwave and RF transparency. Its high alumina content makes it compatible with many extreme chemical environments.

Bubble Alumina Specifications


Sizing Bulk Density Sizing Bulk Density
0-0.2mm 1000-1450 0-3mm 650-950
0-0.5mm 800-1100 0-5mm 600-900
0.5-1mm 650-850 1-2mm 550-800
0-1mm 700-1050 1-3mm 550-800
1-1.5mm 550-800 2-3mm 500-750
0-2mm 650-1000 2-5mm 500-750
1.5-2mm 550-800 3-5mm 450-700

Chemical Composition:

Chemical Composition (wt%)
Al2O3 SiO2 MgO Na2O Fe2O3 CaO
98.8 0.8 0.05 0.1 0.03 0.3


-High Hardness

-Abrasion / Wear-Resistance

-Chemical Inertness

-Superior Insulating Properties

-Resistance to Thermal Shock

-Dielectric Properties

-High Melting Point

Bubble Alumina Applications


-High-Porosity Application


Bubble Alumina Packaging

Our Bubble Alumina is carefully handled during storage and transportation to preserve the quality of our product in its original condition.



Related Documents
Alumina Ceramic Materials Brochure
Technical brochure for Alumina Ceramic Materials, all grades. Revision March 2023.
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