Metal Pall ring packing has many advantages ,such as:larger flux,smaller resistance,smaller Separation efficiency and small operating flexibility. ModelSpecific Surface Area m2/m3Void Ratio %Packing Efficiency Piece/m3Specific Gravity Kg/m3Material25×0.52159551000385coherer38×0.61359614500310coherer50×0.8105966300320coherer80×1.280961600300coherer