0.22um 0.45um 25mm Syringe Filter Nylon,Syringe Filter For Lab - 2.Filter diameter have 13mm and 25mm two types. Filtration membrane aperture has 0.22, 0.45um 3.Membrane material has:RC, Nylon, PVDF, PTFE, PP, etc. Choose proper membrane is very important. luer lock PTFE 0.22 micron filter Aijiren-Analytical Testing