Penetrant Testing


Dye Penetrant Inspection (DPI), also called Liquid Penetrant Inspection (LPI) or Penetrant Testing (PT), is a widely applied and 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 and ferrous materials, although for ferrous components magnetic-particle inspection is often used instead for its subsurface detection capability.


Our solution

AlphaNDT’s DPI can be used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity, leaks in new products, and fatigue cracks on new construction and on in-service components.



  • A relatively fast, easy and inexpensive means of surface inspection.
  • Large quantities of parts or materials can be inspected quickly.
  • Parts of almost any shape and size can be inspected.
  • Can be performed on most materials that are not extremely rough or porous.
  • Highly sensitive to small surface discontinuities.
  • Reduce the risk of company liability with documented safety standards
  • AlphaNDT´s exclusive, one-stop shop services.