sterile PTFE membrane filter 0.22 um for coal-Analytical Oct 21, 2021 · Leading Supplier of PTFE Syringe Filter,Welcome to Inquiry Low Cost Membrane Filters - Samples Available - Ships Next 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