100pcs PES Membrane 33mm 0.22um 0.22μm Syringe Filters Non Filter pore size: 0.22μm. Something went wrong. View cart for details. Syringe Filter, PVDF, 0.45μm, 33mm, STE-Mart – STEMart Syringe Filter provided by STE-Mart is made of PVDF, PES,MCE,Nylon or PTFE with 0.22μm or 0.45μm pore size and available in 13mm, 25mm and 33mm sizes.