T.O. 33B-1-12-22.1.4 CapabilitiesofPenetrantInspection.Penetrant inspection is an inexpensive and reliable nondestructive inspection method for detecting discontinuities thatare open to the surface of the item to be inspected. It can be used on metals and other nonporous materials that are notattacked by penetrant materials. With the proper technique, it will detect a wide variety of discontinuities ranging insize from readily visible flaws down to the microscopic level, as long as the discontinuities are open to the surface andare sufficiently free of foreign material.2.1.5 BasicPenetrantProcess.The basic fundamentals of the penetrant process have not changed from the oil-and-whiting days. The followingprovides a simplified description of the fundamentals. More explicit process details are discussed in subsequentsections. Figure 2-1 illustrates the basic principles of the penetrant inspection process.Figure 2-1. Basic Penetrant Inspection Process.
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