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Non Destructive Examination (NDE)

Dye Penetrant Inspection

Dye or liquid penetrant inspection is a widely applied to locate surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). The inspection is a two-stage process. Firstly the penetrant is applied to the surface. The penetrant is designed to fill any defects that exist on the surface. After some time to allow the penetrant to fully infiltrate any defects, a developer is used to highlight high concentrations of the penetrant.

Penetrant may be applied to both non-ferrous and ferrous (magnetic) materials, but for inspection of ferrous components magnetic particle inspection is preferred for its sub-surface detection capability. DPI is used to detect casting and forging defects, cracks, and leaks in new products, and fatigue cracks on in-service components.


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