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It can reduce the surface tension of water, solution, suspension, etc., prevent foam formation, or reduce or eliminate the original foam. 

Defoaming agent should have the following properties: strong antifollering force and less dosage; added to the foaming system does not affect the basic properties of the system, namely not react with the deflering system; small surface tension; good balance with surface; good heat resistance; good diffusion and permeability, high spreading coefficient, chemical stability, strong oxidation resistance; good gas solubility and permeability; small solubility in foaming solution; no physiological activity and high safety. 

Defoaming agents are widely used in such as food industry, paper, water treatment, oil production, printing and dyeing, coating, detergent, rubber latex, aerosol, Japanese, chemical, pharmaceutical, dairy industry, etc.