0.22/0.45/1 micron. Application: Liquid filter. Design pressure: 4bar@ 21℃; 2.4bar@ 80℃. Product Description. Microporous pleated filter element, the main filter material is : Polypropylene, Hydrophobic PTFE, Hydrophilic PTFE,Polyether sulfone, Nylon, etc. Most of the raw materials are imported from abroad.Pleated filter element is a kind