1.Material:Alumina ceramic 2.Vickers Hardness:1250~1300 3.Wear Rate: ... 0.5mm/min Wet Method of wear rate with balls Alumina Ball mill Mill Size:1500cc Media Size:20mm Media Feet ... Packing Volume=30%) Dry Method of wear rate with balls Alumina Ball mill Mill Size:1500cc Media Size:20mm Media Feet ... ,other field would be paints, chemicals, electronics, plasticsISO certificate Alumina ceramic grinding ball