Liquid Penetrant

Liquid Penetrant testing is quite possibly the most widely used non-destructive testing method. A test subject or part is cleaned then coated with a visible or flourescent type dye. After a pre-determined time interval or dwell time, the dye is then removed from the surface. A developer is then applied. This developer draws the penetrant out of the imperfections or flaws in the material to the surface. If a visible dye was utilized, the vivid contrast between the penetrant and the developer makes the dye bleedout visible to the eye. However, if a flourescent dye was utilized, an ultraviolet lamp is required to make the bleedout visible.

Tools similar to those above are

utilzed in Liquid Penetrant Testing.

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