SILFOAM SE 40 is a relatively heat-resistant, viscous, non-ionic antifoam emulsion that is extremely stable, even at temperatures around boiling point. It is usually admixed with formulations or liquors to be defoamed before the process begins, and extra may be added as necessary during the course of the process. SILFOAM SE 40 can be used in closed systems at a pH of between 3 to 11, and from ambient temperature up to 130 °C. It is therefore generally recommended for critical systems, especially high-temperature systems, in which it acts as a foam suppressant and deaeration agent. SILFOAM SE 40 provides benefits such as stability at high temperatures and prevents oily deposits that can contaminate products. It is suitable for applications that require durability under heat and pressure.