Abstract: Disclosed are antifoam emulsions useful in control of foam in aqueous foaming systems which comprise:(A) polydiorganosiloxane;(B) fine solid particles of inorganic oxide, bearing on the surface thereof a polydiorganosiloxane component; wherein the total amount of polydiorganosiloxane present in components (A) and (B) comprises 5 wt % to 60 wt % of the emulsion and the weight ratio of the total amount of polydiorganosiloxane present in components (A) and (B) to the amount of said inorganic oxide is 10:1 to 200:1;(C) an organic surfactant dispersing agent selected from the group consisting of non-ionic tetrafunctional block copolymers terminating in primary or secondary hydroxyl groups and mixtures thereof, which agent comprises 0.