Dye Penetrant Testing

To reveal surface breaking flaws

Dye Penetrant Testing

Dye Penetrant Inspection (DPI), also known as Penetrant Testing (PT), Liquid Penetrant Inspection (LPI) or Fluorescent Penetrant Inspection (FPI).

Dye Penetrant Testing is a method that is used to reveal surface breaking flaws by bleed out of a coloured or fluorescent dye from the flaw. Dye Penetrant Inspection can be used on almost any non-porous material.

  • On Site Technicians, available
  • Availability 24/7
  • Instant results
  • Computerised reports

The technique of Dye Penetrant Inspection is based on the ability of a liquid to be drawn into a clean surface-braking flaw by capillary action. After a period of penetration time, excess surface penetrant is removed and a developer applied. This draws the penetrant from the flaw to reveal its presence. Colour contrast penetrant requires good white light while fluorescents need to be used in darkened conditions with an ultraviolet light (also known as Black Light).

Technicians available throughout the UK

DPI testing can be carried out on site throughout in the UK, our Technicians are all dual-qualified in PCN / ASNT and produce computerised reports on site at the time of a test. DPI Testing is normally carried out in conjunction with other NDT methods to produce a comprehensive Inspection Service.

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