Non destructive testing liquid penetration
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Liquid penetrant inspection
Dye penetrant inspection (DP), also called liquid penetrate inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials (metals, plastics, or ceramics).
The penetrant may be applied to all non-ferrous materials and ferrous . ISO , Non-destructive testing -.
Description:Emulsifiers represent the highest sensitivity level, and chemically interact with the oily penetrant to make it removable with a water spray. The oil and whiting method used an oil solvent for cleaning followed by the application of a whiting or chalk coating, which absorbed oil from the cracks revealing their locations. Soon a dye was added to the liquid. Penetrant inspection, continuous-operation production lines in which the specimens are cleaned, dipped, washed, dried, etc on a time cycle are common.