... .2% Good round sphere,smooth surface,pearl-like sheen. Zirconium Oxide Bead Specifications:Composition:ZrO2 94.6%,Y2O3 5.2±0.2 ... under high speed impact.30-50 times better than glass bead in terms of wearability.Higher density than any other grinding ... bead brings higher grinding efficiency, thus allowing higher solid proportion or ...