This method is used to reveal surface breaking defects by the bleed out of a colored or fluorescent dye. The technique is based on the ability of a liquid to be drawn into a surface breaking defect by capillary action. This method is a generally low cost solution which is applicable on most solid materials and can be used for the inspection of newly fabricated products as well as on in-service components.


Advantages of the penetrant method of Non-Destructive Examination are:

  • It is a very sensitive method, capable of finding extremely fine flaws
  • It can be used on magnetic and non-magnetic metals, some plastics and glass
  • Small objects, with awkward shapes, can be inspected
  • A power supply is not needed for some methods of penetrant testing
  • The method requires no great skill and is easy to understand
  • Lots of small articles, in batches, can be examined using automated systems


Dye penetrant inspection may be applied under day light conditions using a red contrast dye for regular sensitivity flaw detection. When a high detection sensitivity is required the fluorescent method may be used under appropriate light conditions.


  • Cracks
  • Fractures
  • Pin holes in welds
  • Seams
  • Welding imperfections


  • High class NDT examinations.
  • Multidiciplined NDT operators.
  • Certified according all major AICS.
  • Certified according to DNV-GL CP 0484 offhore (formerly known as 402B).
  • 24/7.
  • Worldwide.
  • Flexible teams.
  • Validated NDT reports according mandatory regulations.
  • Cloud based reporting.


Disadvantages of the penetrant method of Non-Destructive Examination are:

  • Can only detect defects open to the surface
  • Preparation, before testing, can be time consuming and costly
  • The method takes time and can rarely be completed in less than 30 minutes
  • The method cannot normally be applied to painted objects
  • It is messy
  • Interpretation of results is sometimes difficult
  • There may be a problem disposing of contaminated cleaning and penetrant fluids
  • Dry, clean, conditions are essential, as is careful cleaning of the surfaces to be examined


Our experienced project management team will ensure that your inspection requirements are completed on time and within budget. The magnetic particle inspections of your products and assets will be reported according the national and international standards. All our reports are digital and cloud based.