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Silicone Defoamer Market: Global Industry Analysis (2021-2027) Defoamer is a chemical additive that reduces and obstructs the formation of foam in several industrial processes involving liquids. Silicone defoamer is a concentrated silicone emulsified agent that has superior foam reduced and suppression capabilities. Silicon-based defoamer is used to prevent foaming in drilling fluids, free workover, and completion fluids. It is very effective in low concentration rate and at a wide range of pH.