Liquid Penetrant Testing (PT)
In addition to visual and Magnetic Particles Testing methods, the Penetrant Inspection method is one of the most commonly used surface inspection methods. In this method firstly the penetrating powder sprayed onto the surface of material and after specific duration of time, the developer spray used to remove the penetrant liquid from the surface imperfection of sample, after bleeding, the imperfections can be seen visually. This method is just used to non-porous materials.