Magnetic Particle Testing

Identify Defects with Magnetism

Magnetic Particle TestingMagnetic Particle Testing, also referred to as MPI Testing and Magnaflux Testing, identifies surface flaws in metal products that can be magnetized. Magnetic particle testing is performed with either a wet solution or dry powder containing small magnetic iron particles. When these small particles are applied to the surface of the test material, either during or after magnetization, they will be attracted to the magnetic field. The attraction to the magnetic field causes the particles to accumulate in flaws such as cracks, laps and seams, where they will be visible to a trained and certified NDT Inspector.

Mag Particle Testing Methods

Wet fluorescent magnetic particle testing is performed most often at Laboratory Testing Inc. with a solution of very small particles contained in a liquid carrier. The wet solution has an advantage over the dry in that it is easily sprayed, flows well to small leakage fields and the fluorescence allows the particles to be seen without difficulty under our special lighting. The Lab’s Magnaflux testing machines provide a maximum output of 6,300 amps and can handle products that are up to 12 ft. long. LTI also performs MPI testing using the visible dry powder method, when wet fluorescent magnetic particle testing is not an option for certain size products.

Magnetic Particle Testing Summary

  • MPI Testing Methods – dry powder and wet fluorescent magnetic particle testing
  • Size Limitations – products up to 12 feet in length
  • Product Requirements – ability to be magnetized
  • Test Supplies – Magnaflux brand
  • Test Specifications – ASTM E1444, MIL-STD-1949, MIL-STD-271, MIL-STD-2132, AMS 2300 Series

The NDT Inspection Department at LTI performs a number of other test and inspection services. Use our RFQ form for a quote or our Contact Us form to find out about the many testing and calibration services available at LTI to make your job easier.

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“I wanted to say thank you to the LTI Team for all the support they have provided in our source inspections, as well as on expedited projects. It is nice to work with a group that not only has technical knowledge, but cares about getting the job done right the first time. I know I can count on the LTI team to help me in many situations. N.G.K. Metals looks forward to many more years of working with you.”

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N.G.K. Metals Corp.


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