Dye penetrant

Dye Penetrant Dye penetrant testing is a widely applied and low-cost inspection method used to locate surface-breaking defects in metals, plastics or ceramics. A liquid penetrant is applied to the surface and left to soak. After the soak time has expired, the excess penetrant is wiped off and a developer is applied. The developer is drawn out of the crack, resulting in a colored indication on the surface that is broader than the actual flaw, and therefore much more visible. Melchers supplies red penetrant chemicals, developer, cleaner, UV lamps and fluorescent penetrant.