hydrocarbon oil based antifoams compositions containing a hydrocarbon - silicon copolymer , a hydrophobic filler , an organo - silicone surfactant , a hydrocarbon carrier oil and optionally a silicone oil act to effectively defoam concentrated solutions , including those containing ionic surfactants or protein based solutions . the use of the hydrocarbon oil based silicone antifoams represents an inexpensive route to defoams difficult solutions .