It is an anti-foam agent or foam remover. Shortly, defoamer is a chemical additive substance that reduces and prevents foam formation in the liquids of industrial processes. Anti-foam and defoamer are two terms interchangeably used in usual. Accurately, defoamer removes the existing foam and prevents extra foam formation. The commonly used factors are insoluble oils, dimethylsiloxane, other silicones, some alcohols, esters and glycols.