... 3.Good resistance to impact High Purity Alumina Ceramic 99% AL2O3 Packing Ceramic Balls Alumina Balls Grinding Media Specifications ITEMS92%AL2O375 ... ,20,30,40,50,60,70Specifications:95%,99%,99.7% Al2O3 Material Parameters: ItemTest ConditionUnit Symbol95%Alumina ceramics99%Alumina ceramics99.7 ... Oxide Ceramic, Alumina Ceramic Parts High Purity Alumina Ceramic 99% AL2O3 Packing Ceramic Balls