Basics 3 min read
Use and Selection of a Developer
The use of developer is almost always recommended. One study reported that the output from a fluorescent penetrant could be…
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Basics 6 min read
Penetrant Removal Process
The penetrant removal procedure must effectively remove the penetrant from the surface of the part without removing an appreciable amount…
Basics 4 min read
Penetrant Application and Dwell Time
The penetrant material can be applied in a number of different ways, including spraying, brushing, or immersing the parts in…
Basics 4 min read
Selection of a Penetrant Technique
The selection of a liquid penetrant system is not a straightforward task. There are a variety of penetrant systems and…
Basics 3 min read
Preparation of Part
One of the most critical steps in the penetrant inspection process is preparing the part for inspection. All coatings, such…
Basics 4 min read
Developers
The role of the developer is to pull the trapped penetrant material out of defects and spread it out on…
Basics 2 min read
Emulsifiers
When removal of the penetrant from a defect due to over-washing of the part is a concern, a post-emulsifiable penetrant…
Basics 1 min read
Removability
Removing the penetrant from the surface of the sample, without removing it from the flaw, is one of the most…
Basics 2 min read
Dimensional Threshold of Fluorescence
The dimensional threshold of fluorescence is a property that is not currently controlled by the specifications but appears to largely…
Basics 4 min read
Penetrant Testing Materials
The penetrant materials used today are much more sophisticated than the kerosene and whiting first used by railroad inspectors near…
