Oct 11, 2021 · Aijiren PTFE membrane filter 0.22 um for coal Iso9001 0.22um hplc filter vials for filtration Aijiren-HPLC Syringe filters with cellulose acetate or polyethersulfone membranes are ideal for sterile filtration of buffers, tissue culture media or additives, and other biologicals. The polyethersulfone membrane offers high flow rates.