Non-Destructive Testing (NDT)
Liquid Penetrant Tes
Penetrant Testing (PT) is a non-destructive testing (NDT) method dedicated to detecting surface defects that are invisible to the naked eye. It relies on the capillary action of specially formulated indicator liquids that penetrate into surface-breaking discontinuities.
This method reveals defects by forming indication patterns on the surface of the tested material. These indications have high optical contrast (in color and brightness) and are often wider than the actual defect opening, making them easily visible.
During the process:
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A penetrant liquid is applied to the surface of the test item.
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Through capillary action, the liquid enters any surface cavities or cracks.
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After a suitable dwell time, excess penetrant is removed.
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A developer is then applied to draw out the penetrant remaining in the flaws.
As a result, indications appear:
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As red marks on a white background in dye penetrant testing (DPT), or
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As fluorescent patterns under ultraviolet (UV) light in fluorescent penetrant testing (FPT).
Liquid Penetrant Testing is suitable for use on a variety of materials, including steel, glass, composites, plastics, and ceramics.
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