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POLYFIX series is a hollow fiber membrane filter made up of all-olefin(Polypropylene and polyethylene).Filtration accuracy is very fine (20, 50, 100nm= 0.02, 0.05, 0.1um). POLYFIX has an excellent capture capability. FD series has 2 type. One type is 5 inch size(FD05) Another type is 10 inch size(FD10)