PTFE (Teflon) Membrane Filter, Hydrophobic, White, Non-sterile, Plain Discs, 0,2 μm, 47 mm, 100 pcs/pack Article no.: PT02047BL 47 mm Hahnemühle non-sterile membrane filter is recommended for filtration and sterilisation of aggressive organic/inorganic solvents and samples and for venting and has a 0,2 μm pore size.