Merck PTFE membrane filter 0.22 um for sterilization Nov 16, 2021 · Teffil PTFE 0.2 micron filter for sterilization-Analytical Oct 29, 2021 · Sep 28, 2021 · Disposable filters are 0.2 micron rated and contain a Pall hydrophobic PTFE membrane and are ideal for the sterile venting of small containers and as an in-line gas filter.