Nov 9, 2021 · MilliporeSigma Medical Millex -GP Syringe Filter Unit, 0.22 m. EMD Millipore Millex™-GP Sterile Syringe Filters with PES Membrane are ready-to-use, syringe-driven units with a unique membrane that results in six times less protein binding. Available in a medical grade unit, with a PES or acrylic tip. Available in 4, 13, 25, 33, and 50 mm