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Magnetic Particle Inspection (MPI testing), sometimes called Mag Particle Testing or Magnetic Particle Testing (MPT), is a nondestructive testing (NDT) process for detecting surface and slightly subsurface discontinuities for ferromagnetic materials such as iron, nickel, cobalt and some of their alloys. The presence of a surface or subsurface discontinuity in the material allows magnetic flux leakage. Leakage is detected by the use of ferrous materials that are attracted to flux leakage.

Wet magnetic particles are applied to a part undergoing inspection, and the above phenomenon takes place. The part is then inspected under a UV light which indicates the presence of any cracks or chips alongside fluctuations in the magnetic field. A course of action can be decided upon following this, depending on the nature of the problem.

Dye Penetrant Inspection (DPI), also called Liquid Penetrant Inspection (LPI) or Dye Penetrant Testing (DPI), is a widely applied and low-cost inspection method used to locate surface-breaking defects in all non-porous materials such as metals, plastics or ceramics.

The penetrant testing (pt) test method uses low surface tension liquids as a type of penetrant to identify hairline cracks in the surface of an object. Liquid penetrating testing is a method of non destructive testing. Penetration time can take anywhere from 5 to 30 minutes before cracks are open to the surface on the test part and identifiable under a hand held UV light.

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