The present invention relates to a method of producing a hydrophilic polyurethane foam structure containing a silver salt. The method comprises the steps of: a) providing a water phase containing a surfactant, and at least one silver salt, wherein some of the at least one silver salt is dissolved in the water phase and the rest of the at least one silver salt is dispersed in the water phase； b) providing a isocyanate-terminated polyether having functionality of more than 2； c) mixing said water phase and said isocyanate-terminated polyether, immediately transferring the resulting mixture to a mould whereby a foam structure is obtained； and d) drying said foam structure until it has a moisture content of at most 10 % (wt). The invention also provides a hydrophilic polyurethane foam structure produced by the method and a wound dressing containing the foam structure.
