sherwin fluorescent permeationInspection is a non-destructive testing method used to detect surface cracks, joints or discontinuities in parts. Parts that undergo the fluorescent penetration inspection process are typically safety-critical components in aerospace and automotive. These surface defects show up as "signs" under a black light during inspection. These components are specifically used in aircraft, helicopters, cars and medical implants.

Dye penetration testing and liquid penetration testing are synonyms for fluorescent penetration testing (FPI). This inspection process is robust and harmless to the part under test. FPI uses dye penetrants that fluoresce under UV-A (365 nm) black light. After treatment according to ASTM 1417, the fluorescent dye "sticks" to the surface mark on the surface of the part. Then, during the inspection process, the adhesive penetrant can be observed under black light. The cracks hold the fluorescent penetrant in place and are visible to the naked eye when the developer is applied.

Fluorescent penetration testing is used for non-porous materials such as metals, plastics, ceramics and glass. This inspection is a critical part of manufacturing safety-critical components. Once the critical size is reached, the surface crack will spread. This phenomenon can lead to catastrophic component failure. It is important to perform proper treatment to show signs of surface cracks so that the part can be repaired or replaced. As safety-critical components go through their life cycle, it is important to carry out routine non-destructive assessments in the form of fluorescent penetration inspections to minimize component failures in service.

Tests can be performed on new products or components in use that require analysis for cracks that may appear over time.

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