... : <0.5% 4) Fe2O3: <0.05%Ceramic balls are used as covering and supporting materials of catalysts in reaction ... support and protect the activating catalyst with low strength.DONGFENG ceramic ball Product sizeØ3 ,Ø6 ,Ø8 ,Ø10 ,Ø13 ,Ø ... ,Ø65 ,Ø75 Product Application FieldsInert aluminum oxide ceramic balls are widely used in many fields, includingpetroleumchemical engineeringfertilizer productionnatural gas ...