Pall Acrodisc ptfe membrane filter 0.2 um for metals Acrodisc Syringe Filters with PTFE Membrane, Pore Size Pall® 4542 Acrodisc Syringe Filters with PTFE Membrane, Pore Size 0.2 µm, Diameter 13 mm, Pack of 1000 Filter Media: Hydrophobic PTFE Housing: Polypropylene Type: Syringe Filter Use: Particulate Filter, Instrument Protection Pore Size