There are many factors to consider when choosing the right penetrant for an application. The governing specifications are the top consideration, but along with those you must also consider the surface finish and configuration of the part, the size and location of defects to be found, and the in-use function and environment of the parts, such as parts used in critical rotating or moving components or parts subjected to excessive heat.
To meet the wide variety of application needs, penetrant materials are designed to perform differently, and they have different advantages and disadvantages. In this article, we will compare water washable and post emulsifiable penetrant and highlight the differences between these two types of penetrant.