Plastic heilex ring for Gas absorption, cooling and gas purification 1. Material: PP ,RPP,PVC ,CPVC ,PTFE ,PFA ,PVDF 2.ISO Plastic Heilex Ring is made from heat resistant and chemical corrosion resistant plastics.It has features 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 ...