The present invention relates to a defoamer composition containing:(a) from 0.8 to 3.0 parts by weight of silicone, wherein the silicone is in aqueous dispersed form employing a nonionic emulsifier;(b) 5 to 40 parts by weight of mineral oil;(c) 2 to 20 parts by weight of hydrophobic silica;(d) 0.7 to 11 parts by weight of at least one nonionic surfactant selected from the group consisting of ethoxylated dioctyl or dinonyl phenols having a degree of ethoxylation of from 6 to 15, dioleate esters of polyethylene glycol, and ethoxylated hydrogenated castor oils;(e) 0.2 to 4 parts by weight of acrylic polymer;(f) 0.02 to 0.4 parts by weight of alkali metal hydroxide; and(g) the balance, water, based on the weight of the defoamer composition and methods of preparing said compositions.