Liquid Penetrant Testing


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10+ years of experience

Always quick results

Advisory report always included

ISO 9001:2015 & VCA* certified

Detection of defects in metal surfaces

Liquid Penetrant Testing (LPT)is a quick reliable method for detecting surface defects after grinding or welding work on non-magnetisable metal. An advisory report is also always included, allowing you to prevent similar future defects. Liquid Penetrant Testing is mostly applied when working with aluminium, stainless steel and copper.

  • All smooth metal surfaces are suitable
  • Advisory report always included
  • Highly accurate, on-site testing
  • ISO 9001:2015 & VCA* certified
  • 10+ years of experience

Satisfied clients

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Aluminium Lasbedrijf Shipyard
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Advantages of Liquid Penetrant Testing

A major advantage of Liquid Penetrant Testing is that it is a fairly easy method to implement: simply by submerging it. In addition, every metal surface can be tested, as long as it’s smooth. Thus it does prove to be possible to test surface defects, even if the metal isn’t magnetisable.

Due to the use of liquid penetrant that glows up under UV-light, we are even able to detect defects which are as minuscule as 0.1 millimetres. There is also quite a range of Liquid Penetrant Testing methods we can offer, which can be conducted in a wide variety of situations.

  • Easy applicable full testing
  • All smooth metal surfaces are suitable
  • Highly accurate
  • Widely applicable

How does Liquid Penetrant Testing work?

Liquid Penetrant Testing uses a low viscosity liquid (penetrant) that is applied to the surface of the tested material (completely submerging the material is also an option). The liquid then enters the defects on the surface of the material. Following a process time, the excess penetrant is removed, after which a so-called ‘developer’ is applied to the surface in order to draw out the penetrant from any potential defects. Thus clear indications of the defects become visible.

Liquid Penetrant Testing is mainly applied on non-ferrous alloys, yet it is also used on magnetisable materials, for which Magnetic Testing proves to be too complex.

Relevant markets

Staalbouw En Staalconstructie

Steel & Non-Residential Construction

Scheepsbouw En Scheepsreparatie

Ship Building and Repair

Mechanical Engineering

Mechanical Engineering


Food Industry

Liquid Penetrant Testing is also suitable for:

  • Aluminium constructions
  • Processing stainless steel
  • Food processing
  • Tank construction

Frequently asked questions about Liquid Penetrant Testing

Wolter Van Der Zee


Wolter van der Zee
QA/QC / Level III NDT Engineer


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