1、SHERWIN liquid penetrant，It can be a visible or fluorescent material that is evenly coated on the surface being inspected and allows access to open discontinuities. After an appropriate residence time, the excess surface penetrant is removed. The developer is applied to suck the trapped penetrant out of the discontinuity and stain the developer. The test surface is then examined to determine if signs are present.

Note: Fluorescent penetration testing should not be performed after visible penetration testing, as visible dyes may cause the fluorescent dye to deteriorate or quench.

2. Process parameters such as surface pre-cleaning, penetration time and excess penetrant removal methods are expected to be determined by the specific material used, the nature of the part being inspected (i.e., size, shape, surface condition, alloy) and defect type.

3, the liquid penetration detection method indicates the presence, location and, to a limited extent, nature and magnitude of the detected discontinuity. Each of the various methods is designed for a specific purpose, such as critical service items, number of parts, portability, or local inspection areas. The method chosen will depend accordingly on the service requirements.

4. The water-washed penetrant is designed to be washed directly from the surface of the test component after an appropriate penetrant residence time. Because the emulsifier is "built in" to the wash penetrant, it is extremely important to have proper process control when removing excess surface penetrant to ensure that it is not over-cleaned. If the flushing step is too long or too intense, the wash penetrant may be rinsed off in discontinuous areas. Some penetrants are less resistant to excessive rinsing than others.

5. Post-emulsifying penetrants containing lipophilic and hydrophilic emulsifiers are not included in this procedure.

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