Calcined Alumina Products

Calcined Alumina (Al2O3) is produced through the calcination (“heating”) of alumina to various temperatures. By controlling the calcination temperatures and time, the properties of the alumina can be tailored to allow for a broad range of physical properties. Calcined alumina is therefore utilized in a variety of industrial applications including Structural ceramics, Technical ceramics, Polishing compounds for plastic, metal, and glass, Fillers for Rubber and Plastics, Refractories, Paint & Coatings and Thermal Spray Powders.

Typically the primary variables in selecting the proper calcined alumina for your application are:
•Density of crystal: low/soft, medium or high/ hard material
    - These factors are determined by the degree and duration of calcination.
•Surface area of the powder: decreases with a higher degree and duration of calcination.
•Soda content: decreases with higher degree of calcination and chemical treatments.
•Alpha Alumina Content.
•Primary Crystal size.

The chart below describes the sizing, surface area and hardness properties of each individual product. It is organized by calcination level (hardness) with the harder materials starting in the upper left and ending with the softest material at bottom right of the chart.
The sizing of the powders below typically represents the agglomerated state. The agglomerations break down during the polishing process and create a double action of cutting and buffing as the material diminishes down to its primary crystal size. This allows for very fine finish of your material. 

 Martinswerk Calcined Alumina

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Panadyne is proud to be the North American distributor for Martinswerk GmbH located in Bergheim, Germany. Martinswerk is a world leader in producing Calcined and Reactive aluminum oxides used in Polishing, Technical Ceramics, refractories and general filler applications.