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The class of silicone oils covers pure silicone oils as well as organic modified polysiloxanes. In many applications, pure silicone oils are too incompatible and are thus mostly used in low dosages as a silicone tip in combination with other defoamer active species. Organic modification of polysiloxanes, for example with polyethers, enables the compatibility of the defoamer to be tailored to specific application systems. The chemistry of silicone defoamers provides a wide range of modifications for polysiloxanes, resulting in an extraordinary variety of possible polysiloxanes tailored to specific applications Thus silicone defoamers are the most widely used defoamers in the coatings industry [4].