Liquid Penetrant Inspection (LPI, PT)
Liquid Penetrant Inspection is performed by coating the test object with a solution that contains a visible or fluorescent dye.

Best applications for Liquid Penetrant inspections

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Liquid penetrant inspection (LPI or PT) is used to inspect welds on ferrous and nonferrous materials, including plastics and ceramics. It can identify anything from a visible crack to a flaw that is invisible to the eye, but it does not work well on rough surfaces.

During a LPI inspection, the test object goes through the following steps:

  • application of a solution that contains a visible or fluorescent dye
  • removal of the excess solution
  • application of a developer that draws out the remaining solution and in the process identifies a flaw in the surface

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