Liquid Penetrant Testing (LPT), also known as Dye Penetrant Inspection (DPI), is a widely used non-destructive testing (NDT) method to detect surface-breaking defects in non-porous materials. A visible or fluorescent dye is applied to the surface, allowed to dwell, and then excess penetrant is removed. A developer is then applied, which draws the penetrant out of any defects, making them visible to the inspector. It is commonly used to find cracks, porosity, laps, seams, and other surface flaws in metals, plastics, and ceramics.
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