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To meet specific requirements of customers, the R&D department of Datian Chemical has recently developed a new type of silicone defoamer. This defoaming agent used special designed antifoam compound with high alkaline and high temperature resistance, combined with a special emulsion system and emulsion process. Very suitable for industrial cleaning, high alkali, high temperature and high shear foaming system. Form the comparative test and customer evaluation results, the products can maintain good stability in strong alkali and high temperature system, almost no gel or floc precipitation, and has high efficiency defoaming effect and lasting antioaming performance. Desired effect of foam control can be achieved with very low dosage. The antifoam is particularly suitable for such as iron, stainless steel, aluminum, zinc alloy and aluminum alloy cleaning system, and no negative effect on subsequent coating process.