Versatile™-PES is the new MEDICA hollow fiber membrane specially developed for plasma separation, it is a polyethersulfone membrane which is used for plasmapheresis and blood donation. The asymmetric structure of Versatile™-PES offers excellent filtration performances. Versatile™-PES MEDICA membrane has been designed to obtain: * An optimized diameter and wall thickness to ensure a remarkable fiber mechanical resistance and the highest filtering surface in the minimum space; * Very smooth internal membrane surface, ensures less damage to red blood cells in the blood stream and minimizes hemolysis risk. * A high separation performances, in term of plasma proteins crossing the membrane (over %90); * An optimized membrane cut off resulting in the possibility to use a significant TMP value: Medica guarantees a maximum TMP of 100 mmHg without any hemolysis risk. Versatile™-PES is a trade mark of MEDICA S.p