... rates 3.100% integrity tested Polypropylene Pleated membrane filter Cartridge offering the maximum in security, reliability ... gases.Polypropylene Pleated membrane filter CartridgeFeature: 1.Absolute liquid ratings from 0.1µm to 0.45µm 2.Meets ... Pleated membrane filter CartridgeModel: PPM-(A)-(B)-(C)-(D) A:Micron Rating 0.1,0.22,0.45,0.6,0.8, ... 1,3,5,10,20,25,30,35,50,70um B ...