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Penetrant Testing

Penetrant Testing (PT) is a method that uses the capillary action principle to make
open-to-surface defects easier to identify.

Dye or fluorescent penetrant gets applied to a clean surface and is allowed to
penetrate for some time, called “dwell time”. Dwell time allows the fluid a chance to be
drawn into voids, cracks, or pores, and then the excess is rinsed off, then the material
is allowed to dry, followed by the application of a dry powder or wet-aqueous
developer. The developer draws out the penetrant that has filled the voids and cracks
and creates a contrasting appearance that reveals the imperfections to the inspector.

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