... ,38,50mm 3.ISO 9001:2008 4.Acid resisitance(%):>99.6% Hardness-9.5 Grinding Ceramic Ball, Inert White Alumina BallsProfessional manufacturer ... of high alumina ball as catalyst support media Al2O3:17%-99.5%Size: 3,6,9,13,19,25,38,50MMVODA Inert ... -9399Fe2O3 (%)<1<1<1<1<1CaO (%)<0.5<1.5<2<40.2MgO (%)<0.5<2.5<0.5<0.50.1K2O + Na2O (%)<4<4 ... .56>0.44>11/2 inch (13mm)>1.5>1.67>1.56>1.99>33/4 inch (19mm)>4.15>4 ...