OSN is a young process with huge potential. OSN is now used in small quantities in the pharmaceutical, cosmetic, and refinery industries (dewaxing of lube oil). Composite membranes with a thin active layer (1µ m thick) supported on a porous backing are frequently considered in academic and industrial research. They are made of different materials with different structures and properties. They are combined using interfacial polymerization and traditional spin coating or dip coating techniques.