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Alumina Balls | Corundum Balls | Inert Grinding Balls

Raw Materials (Japanese Alumina)
MOH(Mpa) 8.9-9     8.9-9
Color Ivory
Thermal Shock Resistance
Good Good
Coefficient of Thermal Expansion
Thermal Conductivity
Chemical Resistance

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Standard Product Specifications

SKU Number
Diameter (mm)
BL005 5
BL007 7
BL010 10

*For other sizes and specifications, please contact [email protected] for more information

What is Alumina(Corundum) Balls?

High strength, hardness, great wear resistance, high specificity, small size, high temperature resistance, corrosion resistance, being pollution free are just some of the many excellent characteristics of that alumina ceramic balls possess.

These properties are also the main reason why they are widely used in various manufacturing processes across industries like ceramics, enamel, glass, and chemical plants. Particularly in grinding processes, from fine to deep processing of even the thickest and hardest of materials. Thanks to its grinding efficiency and wear resistance (compared to ordinary ball stones or natural pebble alternatives), alumina ceramic balls are commonly used as the preferred grinding medium for ball mills, pot mills, vibration mills and many other grinding equipment. 

Looking for The Best Ceramic Alumina Ball Components?

At JohnCera, we offer our customers the best solutions. And our 99 Alumina ball is no exception with its amazing properties:

High Purity: The alumina content in JohnCera’s proprietary alumina ball is higher than the industry standard of 99%, with the content of silica kept to a maximum of 0.2%. The benefit of this high purity? Better chemical stability and increased hardness. Our highly inert alumina grinding balls are the perfect choice for any processes that involve high temperatures or reactive acid-base environments.

Enhanced Strength and Durability: Our 99 alumina balls come with a Mohs’ hardness greater than 8.9 – making it one of the hardness materials out there! And thanks to that, its significantly reduces wear and tear, allowing you to prolong the service life of the grinding medium. Longer service life, lesser costs, and downtime for your production runs.

High Specific Gravity: The specific gravity of Johncera’s ceramic grinding balls is higher than 3.9g/cm3 – yet another higher than industry benchmark. This benefit? This increased density helps improve the grinding efficiency significantly, reduces grinding time, saves energy consumption and as a result, reduces costs. 


Suitable for cement, minerals, ceramics, electronic materials, magnetic materials, coatings and other grinding media balls, etc.

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