EMD Millipore Optiseal-M filters are 0.2 µm hydrophobic cartridges and have Aervent membrane. They have been developed for removal of microorganisms and pieces from gases and solvents as well as sterilizing processes. The membrane is made of PTFE and parts are polypropylene. This ensures compatibility with a wide range of applications. The filters have been made to be used in combination with Millidisk housings.