... ,10,13,19,25,38,50mm 3.ISO 9001:2008 4.Acid resisitance(%):>99.6% Hardness-9.5 Grinding Ceramic ... alumina ball as catalyst support media Al2O3:17%-99.5%Size: 3,6,9,13,19,25,38,50MMVODA Inert ... <0.5<0.50.1K2O + Na2O (%)<4<4<3.5<4>0.5TiO2 <0.5<0.1<0 ... inch (13mm)>1.5>1.67>1.56>1.99>33/4 inch (19mm)>4.15>4.21>2 ... staffs to answer all your enquires in fluent English.3.OEM&ODM, any your customized sizes we can ...