... 95%: size:3-70mm, 20-70 with same price, Alumina pebbles, used in ceramic tile, cement, chemical, mineral 95% :Advantages:The products are ... : 1. High wear-resisting: The alumina balls’ wear resisting is higher than the common ceramic balls’. When it is working, the ... room. SoIt can improve the grinding efficiency. Index for alumina grinding balls: ProductAl2O3(%)Density(g/cm3)Water absorption(%)Moh’s ...