TEL:01332 986650

Magnetic Particle Inspection

Magnetic Particle Inspection "MPI" (also known as Magnetic Testing "MT") is used for the detection of surface and near-surface flaws (such as cracks) in ferromagnetic materials e.g. steel NDT_MPI.gifand iron.

A magnetic field can be applied to the item under test by either direct magnetization or indirect magnetization. 

  • Direct magnetization is when an electric current is passed through the item under test and a subsequent magnetic field is formed within the material.
  • Indirect magnetism is when no electric current is passed through the test object, but a magnetic field is applied from an outside source such as a 110v portable electromagnet or permanent magnet. 


The presence of a surface or near surface discontinuity causes the magnetic flux to distort or leak.  Fine magnetic particles (either dry or suspended in a carrier fluid) are applied to the surface of the item under test. These magnetic particles are attracted to any area of flux distortion or leakage thus creating a clear visible indication to the operator.

The more sensitive techniques of MPI utilise fluorescent magnetic particles which are viewed in a darkened area under a UV (black) light.

Services on offer from Venture:

  • 6000 Amp Magnaflux Bench Unit. 
  • Fluorescent / Colour Contrast techniques in-house and on-site.
  • Site services offering portable 110v coils, prods and electromagnets.
  • Comprehensive 24hr in-house and on-site service.
  • Approved procedures for control checks.
  • Approved procedures to specific industry standard.
  • Inspectors fully qualified to PCN & SNT.
  • Approved Method Statements, Risk Assessments and COSHH Assessments including confined space entry work.


If you require further information on any of these services please Contact us.

Head Office

Unit 35,
Longbridge Lane,
DE24 8UJ

Tel: +44 (0) 1332 986650

Venture Inspection Brochure

Here you can download the Venture brochure which has all the information you need.

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