Non-Destructive Testing (NDT)

Nondestructive testing or Non-destructive testing (NDT) is a wide group of analysis techniques used in science and industry to evaluate the properties of a material, component or system without causing damage


Nondestructive testing (NDT) is the process of inspecting, testing, or evaluating materials, components or assemblies for discontinuities, or differences in characteristics without destroying the serviceability of the part or system. In other words, when the inspection or test is completed the part can still be used.

In contrast to NDT, other tests are destructive in nature and are therefore done on a limited number of samples (“lot sampling”), rather than on the materials, components or assemblies actually being put into service.


These destructive tests are often used to determine the physical properties of materials such as impact resistance, ductility, yield and ultimate tensile strength, fracture toughness and fatigue strength, but discontinuities and differences in material characteristics are more effectively found by NDT.


Nondestructive testing – NDT – use test methods to examine an object, material or system without impairing its future usefulness. Non-destructive testing is often required to verify the quality of a product or a system. Commonly used techniques are

  • AET – Acoustic Emission Testing
  • ART – Acoustic Resonance Testing
  • ET – Electromagnetic Testing
  • IRT – Infrared Testing
  • LT – Leak Testing
  • MT – Magnetic Particle Testing
  • PT – Dye Penetration Testing
  • RT – Radiographic Testing
  • UT – Ultrasonic Testing
  • VT – Visual Testing (VI – Visual Inspection)