Alumina Grinding Media

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GNPGraystar’s Alumina Grinding Media (spherical) is high grade milling media produced by isostatic pressing and fired at high temperature. These feature high hardness, high density, low wear loss, good normalization, and good corrosion resistance

This material data has been provided by GNPGraystar Specialty Materials.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
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





3.6 g/cm³

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Water absorption

0.01 %

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Hardness, Mohs

9.0 [-]

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Technological properties

Application areas

GNPGraystar’s Alumin Grinding Media is used in wet grinding (batch and continuous ball mills), ceramic glaze grinding, and in dry grinding of resins, ceramic raw materials, and other mineral products.


Beads/Balls are available in 1, 3, 6, 8, 10, 13, 15, 18, 20, 25, 30, 35, 40, 45, 50, 60, 70, & 80 mm diamters.

Cylinders are available in 12x12, 20x20, 30x30, 35x35, 40x45, and 50x55 mm.

Other sizes/shapes available upon request.

Wear resistance

Wear rate of maximum 0.15%