Syringe Filter Nylon for Laboratory. Nylon syringe filters are made of nylon membrane and a polypropylene overmold housing. Available in 13 mm and 25 mm diameters and 0.22 μm and 0.45 μm pore sizes. Part No. Description. FN1322. 13mm Nylon Syringe Filter 0.22um, Green, 100pcs/pk. FN1345. 13mm Nylon Syringe Filter 0.45um, Green, 100pcs/pk. FN2522.