Fluorescent Penetrant Inspection
**Fluorescent Penetrant Inspection**
What is Fluorescent Penetrant Inspection?
Fluorescent Penetrant Inspection (FPI), also known as Dye Penetrant Inspection (DPI) or Liquid Penetrant Inspection (LPI), is a widely used non-destructive testing method to detect surface-breaking defects in all non-porous materials (metals, plastics, ceramics). A fluorescent dye is applied to the surface, allowed to penetrate into flaws, excess penetrant is removed, and a developer is applied to draw the trapped penetrant out of the flaw. Under ultraviolet light, the penetrant fluoresces, highlighting the defect.
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