Home » News » Filter Vials » High quality 0.45um filter vials types Aijiren High quality 0.45um filter vials types Aijiren Aijiren PTFE membrane filter for gasses-PTFE Membrane Filter May 01, 2006 · The 47-mm membrane filter disks (Millipore, Bedford, MA), all having 0.45 μm pore sizes, included nylon 66, hydrophobic a