Acrodisc PSF GxF Syringe Filters Filter Media: Hydrophilic polyvinylidene fluoride (PVDF). Housing: Polypropylene. GxF Prefilter: Binder-free borosilicate glass. Pore Size: 25 mm. Typical Hold-up Volume: \<125 uL. Typical Water Flow Rate: 144 mL/Min.