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Liquid Penetrant


What Is Liquid Penetrant?

In Liquid Penetrant the test object or material is coated with a visible or fluorescent dye solution. The excess dye is removed from the surface and a developer which acts like a blotter is applied drawing penetrant out of imperfections open to the surface. With visible dyes, the vivid colour contrast between the penetrant and the developer is used. With fluorescent dyes an ultraviolet lamp is used to make the ‘bleed out’ fluoresce brightly allowing the imperfection to be seen readily.

Typical Applications
Inspection of Castings
Inspection of Forgings
Inspection of Welds
Inspection of Aerospace Components

A Career in Liquid Penetrant Testing
Careers can be in a variety of areas:

  • Service Inspection Companies
  • Smelters & Foundries
  • Rolling & Forging Mills
  • Petro Chemical & Refineries
  • Mining & Mineral Processing
  • Aircraft Maintenance & Manufacturing
  • Vehicle Maintenance & Manufacturing
  • Government Bodies
  • Engineering Firms
  • Research & Development Facilities
  • Education & Training
  • Equipment Manufacture & Sales
  • Maintenance, Service & Repair of Equipment


What Courses Are Offered?
Liquid Penetrant Level 1 (AINDT AQB) / MEM24001B Perform Basic Liquid Penetrant Testing (AQTF)
Liquid penetrant Level 2 (AINDT AQB) / MEM24002B Perform Liquid Penetrant Testing (AQTF)
Liquid Penetrant Level 3 (AINDT AQB)

More information about the pre-requisites, training and assessment can be found in the ATTAR Student Handbook at our Downloads and Literature page.

Examples of typical math questions can be found at our Downloads and Literature page.

The course syllabus can be found at our Downloads and Literature page.