Plastic pall ring for filtering waste gas: 1.material:PE,PP,RPP,PVC,CPVC,PVDF 2.diameter:16mm,25mm,38mm,50mm,76mm Plastic tower ... such as high free volume, low pressure drop, low mass-transfer unit height, high flooding point, uniform gas-liquid contact, ... small specific gravity, high mass transfer efficiency and so on, and the application temperature in media ...