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Home | Processes & Service | Fluorescent Penetrant Inspection

Fluorescent Penetrant Inspection

The Fluorescent Penetrant Dye (FP) process is one of the oldest forms of non-destructive testing. It is widely used due to the ease of the process and because it can be used on almost any material. Liquid Penetrant Dye testing uses capillary action to reveal surface breaks and makes the flaws appear larger. It provides a high contrast between background and the indicator, making defects easier to identify.

At Electrolurgy, we hold various certifications for dye penetrant inspection, and specialize in the testing of critical components for demanding industries such as aerospace & defense. We offer several variations, including water washable, lipophilic, and hydrophilic penetrant methods to accommodate a wide range of materials, discontinuity types, and sensitivity requirements.

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Applicable specifications

Specification Type/Class/Limitations Description
ASTM E1417 Standard Practice for Liquid Penetrant Testing
SS8806 Inspection, Liquid Penetrant (Sikorsky)
SS8813 Non-Destructive Testing Inspection Plan (Sikorsky)
EMS92358 Penetrant Inspection (Honeywell)
Mil-Std-1907

Frequently Asked Questions

  • The Fluorescent Penetrant Dye process

    The FP dye process requires a clean surface; it is crucial that there is no water, grease, or any other contaminant that could prevent the penetrant from entering and exposing flaws. Once the penetrant dye is applied, it must be left on the part long enough to allow it to seep into any defects. This time is known as the “dwell time” and is determined by the type of penetrant and the material being tested. Optimizing the dwell time requires a thorough understanding of how different types of penetrant dye work with different materials.

    At the end of the dwell period, the extra penetrant is removed from the surface, frequently with a water spray. This must be done very delicately so as not to remove any dye from the cracks. Afterwards, a thin coating of a substance known as developer is added to pull the penetrant to the surface, making it visible under proper lighting conditions. After a few minutes, the part is ready to be inspected for defects.

    Electrolurgy is an industry leader in Non-Destructive Testing (NDT) services, delivering the highest quality products to our customers since 1969. Call or contact us today to speak to an Electrolurgy specialist about Magnetic Particle or Fluorescent Penetrant Inspection or any of our other services.

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