Zirconia Grinding Media Balls
Sintered zirconia ceramic balls used in ball mills for fine grinding in chemical and pharmaceutical labs. Achieves Mohs hardness of 9+ from yttria-stabilized zirconia, fired per Chapter 69 standards for technical durability. Ideal for abrasion-resistant milling of hard materials.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If hardness equivalent below 9 Mohs
Softer ceramic grinding media for technical uses are covered by the lower hardness subheading.
If made from agglomerated synthetic millstones
Grinding balls from bonded abrasives like synthetic corundum are excluded under Chapter 68, not Chapter 69.
If for large-scale industrial furnace use
Ceramic components for metallurgical furnaces may classify under heading 6906 if primarily refractory.
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Import Tips & Compliance
• Include material composition analysis showing >9 Mohs; declare as technical grinding media to prevent misclassification as toys or games in Chapter 95
• Watch for bulk packaging that might trigger set classifications
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