Home > High Alumina Ceramic Balls (17%-99% Al2O3)

High Alumina Ceramic Balls (17%-99% Al2O3)

High alumina ceramic balls are hard, chemically stable alumina spheres used across grinding, catalyst support and wear-resistant duties. Made from alumina in grades from 17% up to 99% Al2O3, they combine high hardness, high crush strength and chemical and thermal stability, so they hold up in corrosive media, at high temperature and under heavy load, without contaminating the process.

Chemical stability: resists acids, alkalis and other corrosive media.
Wear resistance: a hard, dense body stands up to high-speed friction for a long service life.
High-temperature stability: works in high-temperature service, up to around 1580°C on the high grades.
High crush strength: carries a heavy load in a deep bed without fracturing.
Low contamination: an inert, non-porous body keeps the processed material pure.
Full grade range: 17–23%, 23–30%, medium (40–75%), high (85–97%) and 99% Al2O3.
Multi-use: ball-mill grinding, catalyst support media, electronic insulation and wear parts.
Sizes Φ6 to Φ50 mm, in carton box or ton bag.

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Technial Parameters

Item	17-23% Ceramic ball	23-30% Al₂O₃ Ceramic ball	Medium alumina ceramic ball	High alumina ceramic ball	99-Alumina ceramic ball
Al₂O₃+SiO₂(%)	>93	>92	>93	>94	>99
Al₂O₃(%)	17-23	23-30	40-75	85-97	99
Fe₂O₃(%)	<1	<1	<1	<1	0.2
CaO(%)	<0.5	<1.5	<1.5	<0.5	0.2
MgO(%)	<0.5	<1.5	<0.5	<0.5	0.1
K₂O+Na₂O(%)	<4	<4	<3.5	<4	>0.5
TiO₂	<0.5	≤0.5	<0.1	<0.1	0.5
Leachable Fe₂O₃	<0.1	<0.1	<0.005	<0.001	—
Water Adsorption Rate	<0.5%	<0.5%	<1%	<2%	2-5%
Grain Density (g/cm³)	2.3-2.4	2.3-2.4	2.6-2.9	3.4	3.2-3.6
Max Operating Temperature (℃)	980	980	1450	1580	1580
Moh's Hardness	>6.5	>7	>7	>7.5	>7.5
Compressive Strength (KN/Particle)
Φ6mm	>0.5	>0.5	>0.50	>0.6	>1
Φ25mm	>6.5	>6.5	>4.9	>55	>8
Φ38mm	>8.9	>8.9	>5.5	>54	>8
Φ50mm	>9	>9.8	>6.5	>7.8	>15

FAQs

What are high alumina ceramic balls used for?

High alumina ceramic balls are hard, dense alumina spheres used across several duties: as grinding media in ball mills, as catalyst support media under a catalyst or adsorbent bed, and as wear-resistant and insulating parts in industry. They are chemically stable, wear-resistant and hold up at high temperature, and because they are inert they add no contamination to the material they touch.

What alumina grades do high alumina ceramic balls come in?

The balls come in a ladder of alumina grades, from a low grade of 17 to 23 percent, through 23 to 30 percent and a medium-alumina grade, up to high-alumina and 99 percent high-purity grades. A higher alumina content brings greater hardness, higher crush strength, a higher operating temperature and fewer impurities, so the grade is matched to the load, the temperature and how clean the duty must be.

What makes high alumina ceramic balls chemically and thermally stable?

It comes from the alumina and the firing. Alumina is naturally hard and chemically inert, so a well-fired ball resists acids, alkalis and corrosive media and does not react with the process. The dense, low-porosity body takes high temperature without breaking down and stands up to friction, which is why the balls last a long time in grinding, support and high-temperature service.

What sizes of high alumina ceramic balls do you supply?

We supply the balls in the standard diameters from about six millimetres up to fifty millimetres, and grade every batch to size. The size is chosen from the duty, whether it is a mill charge, a support bed or a wear lining, and larger and custom sizes are made to order. Tell us the use and the size and we will match the grade and the diameter.

Can high alumina ceramic balls be used as catalyst support media?

Yes. In the support role the balls sit under a catalyst, adsorbent or desiccant bed, holding it in place, spreading the gas or liquid evenly, and protecting it from the load and the flow. The higher-alumina grades, with their high crush strength and low impurities, suit hot and severe service, while the standard grades handle ordinary support duty.

What is your minimum order and packaging?

The order minimum goes by the grade and the size; standard grades and sizes ship from stock, while a special size or a big order needs a week or two. The balls travel clean and dry, in cartons or one-tonne bulk bags. Send the grade, the size and the amount and we will quote the packing and the timing.

Choosing High Alumina Ceramic Balls

High alumina ceramic balls are versatile alumina spheres used for grinding, catalyst support and wear-resistant duties. What they share is a hard, dense, chemically inert body that resists wear, corrosion and heat and keeps the process clean. Choosing them comes down to the alumina grade and the size, and this guide covers both, along with the main uses.

The alumina grades

The balls run up a grade ladder set by their alumina content, and the grade fixes the hardness, strength, temperature rating and purity. The table below sets out the common grades.

Grade	Al2O3	Max temp	Best for
Low-alumina	17–30%	~980°C	Standard support and covering
Medium-alumina	40–75%	~1450°C	Higher load and temperature
High-alumina	85–97%	~1580°C	Heavy load, grinding, high temperature
High-purity	99%	~1580°C	Fine grinding, hot or reactive service

Properties: hardness, chemical and thermal stability

Alumina gives the balls their properties. They are hard — Mohs seven and above on the higher grades — so they grind and resist wear; they are chemically inert, so they take acids, alkalis and corrosive media without damage; and they are dense and low in porosity, so they hold high temperature, up to around 1580°C on the top grades, without breaking down. Being inert, they add no iron or contamination to the material, which matters in white, electronic and pharmaceutical work.

The main uses

The same high alumina ball serves several jobs. As grinding media it runs in ball, jar and vibratory mills, grinding ceramics, minerals and chemicals with a hard, clean, low-contamination action. As catalyst support media it sits under a catalyst or adsorbent bed, holding and protecting it and spreading the flow. And as a wear-resistant and insulating material it is used in the electronic and process industries. The grade and size are set by which of these the ball is for.

Crush strength and water absorption

Two numbers show how a ball will hold up: crush strength and water absorption. Crush strength, measured per ball at each diameter, tells you the load a ball takes before it fractures — important both in a deep support bed and under mill impact. Low water absorption keeps the ball dense and stable and stops it soaking up fluid. Both improve as the alumina content rises, which is why the higher grades suit the hardest, hottest and most demanding duties.

Sizing

Sizes run from about six millimetres up to fifty millimetres, with larger and custom sizes to order. In a mill, a spread of sizes grinds better than a single size; in a support bed, the balls are layered from large at the bottom to small under the catalyst. We work out the size or the size mix from the duty and the vessel.

Quality and supply

A consistent grade, a clean round shape, high crush strength and low water absorption are what make a high alumina ball reliable, whether it grinds or supports. We supply high alumina ceramic balls across the full grade range and in sizes from Φ6 to Φ50 mm, clean and dry, from sample quantities up to bulk orders by the tonne, packed in cartons or one-tonne bulk bags.