Magnetic Particle Inspection (MPI)


Magnetic Particle Testing (MT)/Magnetic Particle Inspection (MPI) is a non-destructive testing method for detecting discontinuities that are primarily linear and located at or near the surface of ferromagnetic components and structures. Ferromagnetic materials – such as iron, nickel and cobalt – are strongly attracted to a magnet and can easily be magnetized. The process puts a magnetic field into the part. The piece can be magnetized by direct or indirect magnetization. Direct magnetization occurs when the electric current is passed through the test object and a magnetic field is formed in the material. Indirect magnetization occurs when no electric current is passed through the test object, but a magnetic field is applied from an outside source. The magnetic lines of force are perpendicular to the direction of the electric current, which may be either alternating current (AC) or some form of direct current (DC) (rectified AC).


Our solution

AlphaNDT’s MPI can be used for detecting surface and slightly subsurface discontinuities in ferromagnetic materials during new construction and in-service inspections.



  • High sensitivity method for ferromagnetic materials.
  • Easy detection of cracks, surface breaking flaws and near surface flaws.
  • Simple and easy to perform, even in remote locations.
  • Reliable, fast and low cost
  • Reduce the risk of company liability with documented safety standards
  • AlphaNDT´s exclusive, one-stop shop services.