Cobetter Polyethersulfone (PES) membrane adopts a unique patented asymmetric structure, with uniform pore size and high porosity. Sulfonation treatment ensures the high hydrophilicity of the membrane, while maintaining filtration efficiency, high flow rate and strong dirt-holding capacity. Our PES membrane features low protein adsorption and low extractables. It can withstand sterilization methods such as ETO, gamma irradiation, electron beam irradiation, and can be autoclaved at 121 ℃ and 134 ℃. PES membrane is the preferred choice for many medical device designs.