... Plastic pall ring for filtering waste gas: 1.material:PE,PP,RPP,PVC,CPVC,PVDF 2.diameter:16mm,25mm,38mm,50mm,76mm Plastic ... industry and environmental protection, etc. Physical & chemical properties of plastic tower packing Performance / MaterialPEPPRPPPVCCPVCPVDFDensity (g/cm3)0.94-0. ... 50*1.510076*76*2.6739219305876*76*2.673 plastic pall ring packing used in the packing towers in petroleum industry