Phase inversion is a common method to form filtration membranes, which are typically formed using artificial polymers. The method of phase inversion is highly dependent on the type of polymer used and the solvent used to dissolve the polymer.
Phase inversion can be carried out through one of four typical methods:
*Reducing the temperature of the solution
*Immersing the polymer solution into anti-solvent
*Exposing the polymer solution to a vapor of anti-solvent
*Evaporating the solvent in atmospheric air or at high temperature
The rate at which phase inversion occurs and the characteristics of the resulting membrane are dependent on several factors, including:
*Solubility of solvent in the anti-solvent 
*Insolubility of the polymer in the anti-solvent
*Temperature of the anti-solvent