A method of producing a hydrophilic polyurethane foam structure containing inert activated carbon particles, includes the steps of: (a) providing a water phase containing a surfactant and dispersed inert particles； (b) providing a isocyanate-terminated polyether having functionality of more than 2； (c) mixing the water phase and the isocyanate-terminated polyether, immediately transferring the resulting mixture to a mold or a continuous web, whereby a foam structure is obtained； and (d) drying the foam structure until it has a moisture content of at most 10% (wt). A foam structure produced by the method and a wound dressing containing the foam structure are also disclosed.
