What is the more acceptable method for cleaning parts before penetrant testing?

Vapor degreasing is the preferred method for cleaning parts before penetrant testing due to its effectiveness in removing contaminants without introducing additional residues that might interfere with the test results. This method utilizes the properties of solvents in a fully vaporized state to clean the surfaces of components thoroughly and evenly.

Vapor degreasing is particularly useful because it minimizes the risk of leaving behind residues that could create false readings during penetrant testing. The process also effectively cleans complex geometries, ensuring that all surfaces are accessible and free from oils, dirt, or other contaminants that might hinder the visibility of any flaws during testing.

In contrast, while power washing and solvent wiping can effectively clean parts, they have drawbacks such as potential water or solvent residue left on the surface, which can affect the penetration of the dye used in penetrant testing. Sandblasting is more abrasive and can alter the surface finish of the material, which might lead to an incorrect interpretation of the results during testing. This is why vapor degreasing stands out as the most suitable choice for cleaning prior to penetrant testing.