Industrial Chemical Filter Folded Membrane 222 Ss Ring 10 Inch Pleated PTFE 0.2 0.45 Micron. Pleated Filter are widely used in high quality beer&beverage, Biological products, medical, Laboratory, Pharmaceutical and air filtration. In different industry with different requirement, Kinda produce PP Filter of WEP, EWPB, HFP, HPP, APP, PPT