0.22 Micron Polypropylene Micro fiber Membrane Pleated Filter Cartridge Polypropylene pleated filter cartridges are precisely manufactured for use in critical filtration applications within food, pharmaceuticals, biotech, dairy, beverages, brewing, semiconductor, water treatment & other demanding process industries. Polypropylene pleated cartridges use the gradient density micro fiber media technology to provide a combination of excellent micron ratings, high flow rates and high contaminant holding capacities. A special combination of polypropylene media with variation in the fiber diameter creates a gradient density matrix, ranging from open on the outside to finer on the inside, thereby providing a filter with in filter, which considerably increases contamination holding capacity & throughputs. All components used in the manufacturing process are biologically safe, chemically inert and other international quality requirements. Polypropylene offers an extremely broad chemical compatibility making it suitable for many applications.