Grinding media (balls) for mills
Grinding media — balls and beads for ball and stirred mills in eight materials: zirconia (ZrO₂), agate, corundum (Al₂O₃), 304/316 stainless steel, tungsten carbide, polyurethane, nylon and silicon nitride. Diameters from sub-1 mm beads to 40 mm balls, matched to the sample, jar and target fineness.
- Eight materials — zirconia (ZrO₂), agate, corundum (Al₂O₃), 304/316 steel, tungsten carbide, polyurethane, nylon, silicon nitride
- Diameters from sub-1 mm beads to 40 mm balls
- Zirconia 94.8% ZrO₂ — density ≥6 g/cm³, hardness ≥1250 HV
- Selection rule — balls harder and denser than the sample and jar walls
- Beads for wet grinding down to sub-micron fineness
- Large balls for crushing hard, coarse materials
Balls and beads are the actual grinding “tool” — their impact and friction break the sample down. Three things drive their effectiveness: material, diameter and how full the jar is. Good media is harder and denser than both the sample and the chamber walls, so it transfers energy instead of wearing away and contaminating the charge.
Diameter matched to the goal
Large balls (roughly 15–40 mm) work by impact and suit crushing hard, coarse materials. Fine beads (below 1 mm) work by friction across a huge number of contact points — these take you down to sub-micron and nano fineness in wet grinding, especially in stirred mills. Several diameters are usually combined, so the media crushes and finishes at the same time.
Ball material
The material range mirrors the jars — from agate and corundum, through 304/316 steel and tungsten carbide, to polyurethane, nylon and silicon nitride. Zirconia (94.8% ZrO₂) is the most common choice: at over 6 g/cm³ density and ≥1250 HV hardness it delivers high grinding energy and minimal wear, which is why it dominates wet grinding of oxides, ceramics and battery materials. Choose balls in the same or a harder material as the jar; the ready sample–jar–ball combinations are in the grinding guide. Write to us.
Datasheet (PDF) — coming soon