Calcined Alumina

Download: Technical Data Sheet | Safety Data Sheet (SDS)


Calcined Alumina is produced by calcining alumina to various temperatures to control hardness, and therefore, its abrasive properties.


General purpose high purity alpha is traditionally used in bar and liquid compounds, and for lapping where a soft acting, broad-sized alumina can be used.
High purity alpha alumina powders can be used for stone polishing, and some sizes can be used as a friction enhancing material in brake linings, and as an addition to compounds. Other sizes are used in potting compounds to disperse heat, polishing and buffing compounds and also for lapping.

Typical Chemical Analysis:

Aluminum Oxide (Al2O3)98.9%
Silicon Dioxide (SiO2)0.05%
Iron Oxide (Fe2O3)0.02%
Titanium Dioxide (TiO2)0.01%
Calcium Oxide (CaO)0.05%
Sodium Oxide (Na2O)0.80%
Magnesium Oxide (MgO)0.04%

Physical Characteristics:

Crystal Form:Monocrystalline Alpha Alumina
Shape:Hexagonal Platelets
Hardness:Knoop – 2000
pH9.0 – 10.5
Specific Gravity:3.95 g/cm3

ANSI Test Methods:

Chemistry: B74.14
Bulk Density: B74.4
Sizing Method: Coulter Multisizer (Microgrits/powders), and Sieve Analysis (Macrogrits)

Packaging & Shipping:

Warehousing in Bluffton, SC and Niagara Falls, NY
250 lb. or 300 lb. fiber drums
Plastic pails, etc. for a surcharge (SC only)

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