Plastic pall ring for filtering waste gas: 1.material ... diameter:16mm,25mm,38mm,50mm,76mm Plastic tower packing is made from heat resistant and chemical ... For these reasons it is widely used in the packing towers in petroleum industry, chemical industry, alkali- ... protection, etc. Physical & chemical properties of plastic tower packing Performance / MaterialPEPPRPPPVCCPVCPVDFDensity (g/cm3)0.94-0.960 ...