Description Syringe Filters, 0.2 um Hydrophilic PTFE, 25 mm; 100/Pk. Key Features. Non-pigmented acrylic or polypropylene (PP) housings feature integral filter sealing to avoid the risk of contamination from pigments and adhesives. Each filter is clearly marked with membrane pore size. Housings have standard luer connectors; 50-mm filters