A widely applied and low-cost inspection method used to locate surface-breaking defects in all non-porous materials (metals, plastics and ceramics). The penetrant may be applied to all non-ferrous materials and ferrous materials, although for ferrous components, magnetic-particle inspection is often used instead for its subsurface detection capability. Used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity, leaks in new products and fatigue cracks on in-service components. See also Liquid penetrant inspection.
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