... 19,25,38,50mm 3.ISO 9001:2008 4.Acid resisitance(%):>99.6% Hardness-9.5 Grinding Ceramic Ball, ... ball as catalyst support media Al2O3:17%-99.5%Size: 3,6,9,13,19,25,38,50MMVODA Inert ... 5<1.5<2<40.2MgO (%)<0.5<2.5<0.5<0.50.1K2O + Na2O (%)<4<4<3.5<4>0.5TiO2 <0.5< ... 0.1<0.10.5Leachable Iron (%) <0.1<0.001<0.001 Water Absorption (%)<0.5 ... 1/2 inch (38mm)>8.52>8.92>5.33>5.28>82 inch (50mm)>9.7>9. ...