Course Summary

Penetrant Testing


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DPI Principle

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DPI Result


Liquid or dye penetrant testing is a non–destructive method for finding discontinuities that are open to the surface of solid and essentially non-porous materials. Indications of flaws can be found regardless of the size, configuration, internal structure, or chemical composition of work piece being tested and regardless of flaw orientation. Liquid penetrant can seep into (and be drawn into) various types of minute surface openings (reportedly, as fine as 4micro inch in width) by capillary action. Because of this, the process is well suited for the detection of all types of surface cracks, laps, porosity, shrinkage areas, lamination and similar discontinuities in casting, forgings, welds and other product forms. Dye penetrant inspection is used extensively for the testing of wrought and cast products of ferrous and non-ferrous metals, powder metallurgy parts, and ceramics and glass objects.


  • Course Content:
  • • Materials, methods, compatibility of materials, equipment and safety aspects; practical exercises; methods of assessing sensitivity.
  • • The course ends with a written and practical test.
  • • Training in accordance with the requirements of ISO 9712.

  • Certification/Awarding Body:
  • • CSWIP

    • Course Objectives:
    • • To explain the basic principles of penetrant inspection methods
    • • To carry out penetrant inspection using solvent-removable, water-washable and post emulsifiable/removal processes
    • • To write clear and concise inspection instructions and test reports