MIL-STD-6866

Inspection, Liquid Penetrant

This standard establishes the minimum requirements for conducting liquid penetrant inspection of nonporous, metal and nonmetal components. The penetrant inspection processes described in this standard are applicable to in-process, final, and maintenance (in-service) inspections. These processes are applicable for the detection of discontinuities that are open or connected to the surface of the component under inspection. Penetrant inspection processes are classified in accordance with the material classification contained in MIL-I-25135. Penetrant systems covered by this standard shall be of the following types, methods and sensitivity levels.

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