Nov 01, 2021 · Restek PTFE membrane filter 0.2 um for acids-Analytical. Oct 29, 2021 · Sep 28, 2021 · PTFE Membrane Filters, 0.22 um, 25mm, Nonsterile, with PP substrate (Meets the requirements of USP Plastics Class VI) 200 per pack, SF17375 Regular Price: $140.30 Price $126.88. date: 2021-11-01.