TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solvent is a mixture of water and a compatible organic solvent. The compatible organic solvent is ethanol. The photoinitiator comprises a reactive material comprising 2-(4-(2-hydroxy-2-methylpropanoyl)phenoxy)ethyl-2-methyl-2-N-propenoylaminopropanoate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The porous substrate is a membrane comprising at least one polymer material. The polymer material comprises polyolefin. The polymer material is ethylene chlorotrifluoroethylene, polytetrafluoroethylene, polysulfone, poly(ether)sulfone, polyolefins, polyvinylidene fluoride, polyamide and/or cellulose ester. The porous substrate comprises material consisting of non-woven material, woven material or knitted material. The crosslinked polymer is derived from monomers consisting of polyethylene glycol diacrylate and/or polyethylene glycol dimethacrylate. The monomers have a molecular weight of greater than 400 or 600. The crosslinked polymer is derived from a reaction between one or more of the monomers and at least one crosslinking agent. The hydrophilic coating comprises an interpenetrating polymer network of ethylene vinyl alcohol copolymer and the crosslinked polymer. Preferred Process: The process further comprises partially polymerizing the polymerizable compound in the coatable composition either before or after the step (b) of applying the coatable composition to at least a portion of the inner pore walls. The step of partially polymerizing the polymerizable compound comprises thermally initiating a polymerization reaction in the coatable composition to partially polymerize the polymerizable compound before the step (b) of applying the coatable composition to at least a portion of the inner pore walls. The step of partially polymerizing the polymerizable compound comprises photo-initiating a polymerization reaction in the coatable composition to partially polymerize the polymerizable compound after the step (b) of applying the coatable composition to at least a portion of the inner pore walls. The process further comprises preparing the coatable composition prior to coating the pore walls with it, and the coatable composition is prepared by combining the ethylene vinyl alcohol copolymer and the at least one polymerizable compound in a solvent. The process further comprises: (f) washing the coated porous material with water, and (g) thermally drying the coated porous material. The step (e) of polymerizing the polymerizable compound results in the hydrophilic coating comprising both the ethylene vinyl alcohol copolymer and a crosslinked polymer in an interpenetrating polymer network. The coatable composition further comprises at least one crosslinking agent and photoinitiator and where removing at least a portion of the solvent from the coatable composition and the porous substrate to dry the coatable composition is accomplished by evaporating the solvent. The rewetting solution comprises a solution of sodium chloride, and step (e) of polymerizing the polymerizable compound comprises photo-polymerizing the at least one polymerizable compound using ultraviolet radiation.