membrane should be 400 to 800 microns preferably between 500 to 650 microns in accordance with the preferred embodiment of this invention the u201c cast on tricot u201d membrane is fabricated by casting the polymer dope to form a thin layer of solution on the tricot substrate precipitating the membrane in low or ambient temperature water ranging from 0 to 25 u00b0 c typically at about 0 u00b0 c is preferred followed by annealing in high temperature water ranging from 25 to 90 u00b0 c typically at about 86 u00b0 c is preferred the dry membrane can be achieved by evaporating water at or above ambient temperature ranging from 25 to 80 u00b0 c typically at about 65 to 70 u00b0 c the dry asymmetric u201c cast on tricot u201d membrane can be coated with an epoxy silicone solution containing epoxy silicone solution ranging from 2 to 15 wt typically 8 to 10 is preferred the silicone solvent contains a ratio of hexane to heptane solvent ranging from 1 1 to 1 5 ratio typically 1 3 is preferred the epoxy silicone coating then exposes to a uv source for a period of about between 1 to 10 minutes typically 2 to 4 minutes is preferred at ambient temperature to cure the coating while the silicone solvent evaporated to produce the epoxy silicone.