Wide application: due to the special chemical structure of silicone oil, it is neither soluble with water or substances containing polar groups, nor with hydrocarbons or organic substances containing hydrocarbon groups. Due to the insolubility of silicone oil to various substances, it is widely used, not only in water system for defoaming, but also in oil system.           
Good thermal stability: take the commonly used dimethylsilicone oil as an example, it can withstand 150 ℃ for a long time and 300 ℃ for a short time, and its Si-O bond does not decompose. The silicone defoamer can be used in a wide temperature range.           
Small surface tension: the surface capacity of silicone oil is generally 20-21 dyne / cm, which is smaller than that of water (72 dyne / cm) and general foaming liquid, and has good defoaming effect.           
Good chemical stability: because the Si-O bond is relatively stable, the chemical stability of silicone oil is very high, and it is difficult to react with other substances. Therefore, as long as the formulation is reasonable, the silicone defoamer can be used in the system containing acid, alkali and salt.            Physiological inertia: silicone oil has been proved to be non-toxic to humans and animals, and its half lethal dose is more than 34 g / kg. Therefore, organosilicon defoamer can be safely used in food, medical treatment, medicine and cosmetics industries.           
Strong defoaming power: silicone defoamer can not only effectively break the foam that has been generated, but also significantly inhibit foam and prevent foam formation. Its use amount is very small, as long as one millionth (1ppm) of the weight of the foaming medium is added, the defoaming effect can be produced. Its common range is 1 to 100 ppm. Not only the cost is low, but also the defoaming substance is not polluted.