Penetrant (ndt testing)

Dye penetrant inspection (DPI), also called liquid penetrant inspection (LPI) or penetrant testing (PT), is a widely applied & low-cost inspection method used to locate surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). The penetrant may be applied to all non-ferrous materials & ferrous materials, although for ferrous components magnetic particle inspection is often used instead for its sub-surface detection capability.

A penetrant is a coating that penetrates microscopic cracks on a part for subsequent inspection.


This method is followed by an emulsion spraying cleaning process and than a developer powder process.

It is mainly used on aerospace industry to control structural part of an aircraft.

SAMES KREMLIN know how and expertise

SAMES KREMLIN are well aware of the challenges and difficulties of using these systems for non-destructive testing. 

We have a range of dedicated products and solutions.

The following range of equipment is specially adapted to this type of material: