Liquid Penetrant Testing

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Definition - What does Liquid Penetrant Testing mean?

Liquid penetrant testing is a nondestructive material examination procedure used to check for deficiencies such as cracks by spreading a thin liquid dye onto the material's surface, followed by the application of a developer. It is a common method used to check for deficiencies in welds, pipes, bars and other materials.

Liquid penetrant testing is also known by several other names, such as liquid penetrant examination, dye penetrant testing, dye penetration test, and dye penetrant inspection.

Corrosionpedia explains Liquid Penetrant Testing

Liquid penetrant testing is a fast, portable and cost effective procedure for material maintenance. It is typically performed in the following five steps:

  1. Surface preparation
  2. Application of the penetrant
  3. Removal of excess penetrant
  4. Application of the developer
  5. Inspection and cleaning
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