Screen Shot 2015-09-15 at 3.22.40 PM Fluorescent penetrant inspection (FPI) is a type of dye penetrant inspection in which a fluorescent dye is applied to the surface of a non-porous material in order to detect defects that may compromise the integrity or quality of the part in question.
ASTM-E1417 MIL-STD-6866
MIL-STD-1907 AMS2175
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