AcroPrep Advancance Filter Plates for Solvent Filtration - 2 mL, 0.45 µm, GHP membrane (5/pkg) 8784. AcroPrep Advance Filter Plate, 2 mL 0.45 µm, wwPTFE membrane (5/pkg) 60189. Universal Membrane Disc Filters - 0.2 µm, 25 mm (100/pkg) 60538. Membrane Disc Filters, wwPTFE membrane 0.2 µm, 25 mm (50/pkg) 66340.