Everything You Need to Know About Defoamers and Emulsifiers Defoamers and emulsifiers are two types of chemical agents ulized in various industries. They can also be used as ferlizer dust control. Everything you need to know about defoamers and emulsifiers is right here. What Exactly Are Defoamers? A defoamer is a chemical addive that inhibits foam formaon in industrial liquids. It is also known as an an-foaming agent. While "an-foamer" and "defoamer" are somemes used interchangeably, it is crical to recognize that an-foamers prevent new foam from forming, and defoamers remove the exisng foam. How Do Defoamers Funcon?