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Liquid Penetrant Testing

Liquid/Dye Penetrant Testing is one of the most used non-destructive testing (NDT) services. This testing procedure utilises coloured penetration liquid to identify and locate any surface defects through capillary action. Materials that are commonly inspected using this method are metals, glass, rubber, ceramic and plastics. XPERT provides liquid penetrant testing services in Malaysia to our valued clients to ensure quality and standards of materials and products.

XPERT technicians are capable of performing the assessment to ensure the quality and integrity of machine parts, welds, castings, forgings and other items used in facilities and machinery.

Advantages of Liquid/Dye Penetrant Testing Malaysia

• Fast turnaround time

• High sensitivity

• Immediate indication of location of flaws on material surface

• Appropriate for large and complex object shapes

Trusted XPERT Provider of Non-Destructive Testing in Malaysia.

XPERT Engineering Solution is a reputable company that specialises in the provision of testing, inspection and quality assurance services in Malaysia.


Liquid penetrant testing is essentially the process of injecting coloured liquid into a product that will seep into any surface defects. It can detect cracks as narrow as 150 nanometres.

Liquid penetrant testing detects hairline cracks, surface porosity, leaks, and fatigue cracks. It uses liquid dye to see defects that are otherwise not visible to the naked eye.

Liquid penetrant testing can be applied to any non-porous clean material, metallic or non-metallic. It is unsuitable for dirty or rough surfaces.

It is typically a six-step process:

  1. Surface cleaning
  2. Application of a penetrant liquid
  3. Removal of excess penetrant liquid
  4. Application of developer
  5. Inspection of test surface
  6. Post-inspection cleaning