DYE/LIQUID PENETRANT TEST



  • In this topic, you will learn about Dye/Liquid Penetrant testing and their advantages and disadvantages.



  • This method is used to detect flaws that are open to surface such as cracks, porosity and shuts.

  • Dye penetrant test can be effectively used in inspection of ferrous and especially non-ferrous metals such as plastic, glass and ceramics. This is also used to test the weld works.

  • The Specimen which is to be inspected is chemically cleaned first to remove the dirt and other foreign particles.

  • Next, the penetrant which is a very fine thin oil usually dyed bright red or ultraviolet fluorescent is applied and allowed to remain contact with the the surface for 10 minutes.

  • During this period, capillary action draws the penetrate into the crack.

  • The surplus penetrant on the surface is removed completely and thin coating of powder chalk is applied.

  • After certain minutes the chalk draws the dye out of the crack to form visible indication of flaws commonly known as bleed out.


  • Inspector, carries out his inspection after 3 to 5 minutes of development time using ultraviolet radiation.

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