Dye-Penetrant Testing (PT) Services

Capillarity: Penetrant solution containing visible or fluorescent dye is applied to the surface of a precleaned component. The particles of the solution is pulled into surface-breaking defects by capillary action in the test object. A hygroscopic developer is then applied to draw the penetrant out of the defects. With fluorescent dyes, ultraviolet light is used to make the bleedout fluoresce brightly, thus allowing imperfections to be readily seen. With visible dyes, a vivid color contrast between the penetrant and developer makes the bleedout easy to see.