White Calcinated Aluminum Oxide Powder

White Calcinated Alumina (A12O3, also known as Alumina and White Aluminum Oxide powders) is extremely soft, friable, sharp abrasive, similar to Brown aluminum Oxide and has a very low iron content.  WCA has lower hardness and abrasive capacity than fused Aluminum Oxides.


WCA is perfect material for polishing of glass, quartz, semiconductor materials such as silicon, sapphire, gallium arsenide and cadmium telluride).  WCA is widely used for grinding ferrous materials, finishing tough and hard materials, making ceramic parts when the processing cost is important.

Typical Chemical Data

Aluminum Oxide 99.80 (typ.)
Silica 0.01-0.05%
Iron Oxide 0.01-0.03%
Calcium Oxide 0.01-0.03%
Na2O 0.01-0.10

Physical Data

Structure: Monocrystalline
Particle shape: Blocky, sharp edged
Color: White
Friability: Friable
Moh’s Scale: 9
Maximum working temperature: 1650 ͦ F
Density (g/cc): 3.8