The Pall Laboratory wwPTFE Membrane: Our newest wwPTFE membrane comes in a variety of sizes to accommodate sample volumes from 25µL up to 150mL. Providing your laboratory with the ability to process single samples with the new Pall Laboratory Acrodisc One™ syringe filter, small volumes with the Nanosep™ spin device or up to ninety-six samples with the Acroprep™ Advance filter plate.