Acrodisc® Syringe Filters with PTFE Membrane - 0.2 µm, 13mm The Acrodisc® syringe filter featuring a 0.2 µm PTFE membrane, prevents air bubble locks when filling sample vials. Purchase online - syringe filters with a filtration area of 1.0 cm², hold-up volume less than 14 µL and a 13 mm minispike outlet.