Medium Alumina Ceramic Balls for Catalyst Support and Grinding

Medium alumina ceramic balls mostly do support work. A layer of them beneath a catalyst or packing bed takes the weight, keeps fines from dropping through, and evens the flow entering the active layer, all without joining the chemistry. As a mid-priced ball they are chosen for this where top-grade strength is unnecessary, and they double as low-cost grinding media in ball mills and as components in electronic and pharmaceutical work.

The percentage is the alumina content of the ceramic, and it drives the strength, the density and the heat resistance. A medium ball at 50 to 75 percent alumina is harder, denser and more heat-resistant than a low-alumina or porcelain ball, though it stops short of a high-alumina ball above ninety percent on both strength and price. It is the middle option — ample strength and chemical resistance for most support duty, without paying for the top grade.

Yes, for lighter grinding. Medium alumina balls run harder and cleaner than natural pebbles or flint and cost less than high-alumina media, so mills reach for them when a moderate grind and a lower media bill outweigh the last degree of hardness. Fine, high-purity or very abrasive grinding still wants a high-alumina ball or a denser media, but for everyday or budget milling the medium grade holds its own.

Yes. The ceramic stays stable against acids and alkalis and resists corrosive media, and it holds continuous heat to about 1450 degrees without softening. That sits well inside what a support bed at the foot of a hot reactor meets, and paired with a slow wear rate it is why a medium alumina ball keeps its shape and its job for years.

Standard sizes are 6, 25, 38 and 50 millimetres, with others on request. A support layer usually stacks two or three of these, larger balls underneath and smaller on top, the top size set so the catalyst above cannot slip between them. Send us the vessel, the catalyst size and the duty, and we will fix the sizes and the amounts.