They are available in a variety of sensitivity levels. The presence of penetrant on a surface that may or may not show the location of a discontinuity. A nondestructive tool used to find defects. Penetrants highlight flaws and leaks that are open to the surface and are too small to see by normal visual inspection. Penetrants show the presence, location, nature and size of defects.
Lipophilic emulsifiers are oil based and are used undiluted.
They are faster than hydorphilic emulsifiers, but are not as flexible and do not always give as sensitive results as do hydrophilic. Disposal is often more difficult. AGC lipophilic emulsifiers are less volatile and easier to dispose of than others on the market. They can be used with any non water-washable penetrant. A type of penetrant containing no emulsifier but which is cleaned from a surface with water after applying an emulsifier as a separate step.