Ultrafiltration membranes are artificial permeable membranes used in the ultrafiltration process. They are generally made of polymeric materials such as cellulose acetate, cellulose acetate esters, polyethylene, polysulfone, and polyamide. They are typically prefabricated into various types of membrane modules, including tubular, plate, spiral wound, and capillary types, and then multiple modules are assembled together for use to increase the filtration area and facilitate maintenance.
An ultrafiltration membrane is a semi-permeable polymeric membrane used in the ultrafiltration process to separate colloidal or suspended particles of a certain size from a solution. Driven by pressure, the membrane pore size is 1–100 nm, and it is an asymmetric membrane type. The pore density is approximately 10/cm³, and the operating pressure difference is 100–1000 kPa. It is suitable for removing colloidal particles and macromolecules and can separate solutions with a concentration less than 10%.