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Penetrant Testing
Penetrant Testing


Liquid Penetrant Testing (PT) reveals surface flaws in non-porous material and metallic and non-metallic surfaces by the “bleed-out” of penetrating medium against a contrasting background. This is done by applying a penetrant to the pre-cleaned surface and flaw of the item being inspected.

The penetrant is applied to the surface and allowed to remain on the surface for a prescribed time (dwell time); the penetrant liquid will be drawn into any surface opening by capillary action. Following the removal of the excess penetrant, an application of the developer reverses the capillary action and draws the penetrant from the flaw. The resultant indications reveal the presence of the flaw so that it can be visually inspected and evaluated.

Materials that can be inspected using LPT include; metals (aluminum, copper, steel etc.), rubber, glass, and plastics. The LPT is used only to detect surface defects including –

1) Fatigue Cracks
2) Grinding Cracks
3) Porosity
4) Laps
5) Seams
6) Pin holes in welds
7) Lack of fusion along the edge of the bond line

Through this technique, our experts evaluate the condition and quality of a component. With a wide variety of penetrant materials and a custom-made fluorescent penetrant inspection system, we provide both field and lab testing, with high-volume processing of many different parts with both fluorescent and visible penetrants.


Available upon request


  • 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
  • Lots of small articles, in batches, can be examined using automated systems


  • What is Non Destructive Testing?

    Non Destructive Testing is defined as a method used to investigate the integrity of an object, material or system, without impairing its future usefulness.

  • Why is NDT used ?

    It is used to determine the following: a) In place quality of Concrete b) Health of Concrete] c) Influence of Time d) Non-availability of old drawings related to the structure.

  • What is the Accuracy?

    The accuracy of the diameter measured increase with decrease in cover. It also depends upon the diameter of the bar. For example if the cover is 30 mm and bar diameter is 25 mm the accuracy is + 1 mm. This accuracy can improve if either of these parameters i.e. diameter or cover is reduced

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