What is the core function of a solvent cleaner in PT?

In liquid penetrant testing (PT), the primary function of a solvent cleaner is to remove excess penetrant from the surface of the test material. After the penetrant has been applied and allowed to dwell, it is crucial to eliminate any excess material that has not entered surface discontinuities. This step ensures that only the penetrant trapped in the flaws will be released during the development phase, leading to a more accurate and revealing test result.

Using a solvent cleaner effectively prepares the surface for the inspection stage and helps provide clear indications of defects such as cracks or voids. The right cleaning agent will not only remove the excess penetrant but also avoid any adverse effects on the integrity of the material being tested.