c. Surface should be free of floating penetrant (see paragraph 18.104.22.168.2).
d. Solution should be clean and translucent.
e. There should be no odor and no evidence of algae, fungi, or other growth.
f. The developer should wet the part surface, with no water break areas after spray or immersion.
g. Part should be drained over the tank or recovery tray to reduce drag-out losses.
h. Complex shaped parts should be turned over or rotated during draining to remove any pools.
i. The correct developer dwell time must be used with the dwell time starting after the coating is dry.
j. After drying, the coating should be transparent and nearly invisible. In examining the part in reflected
light, there should be no distinct change in sheen indicating a break in the coating.
The inspection booth and process SHALL be observed and checked to verify the following:
a. Area SHALL be clean and of adequate size for the size and number of parts to be inspected. Booth
SHALL NOT be used to store parts since non-relevant indications may be formed when parts contact
b. Area SHALL be free of spilled penetrant and SHALL NOT fluoresce when exposed to black light.
c. Area SHALL be darkened to 2 lumens per square foot or less and SHALL be periodically checked with
an accurate visible light meter for ambient light and documented at least every 60 calendar days or
when a black light bulb is changed.
d. Black light bulb and filter SHALL be kept clean.
e. Intensity of the black light SHALL be checked and documented at least once each day prior to use.
f. Filters SHALL be inspected for fit and be free of cracks.
g. Black lights SHALL be positioned so they do not shine into the technicians eyes.
h. Technicians must observe the dark adaptation eye adjustment period.
Portable Inspection Process.
Shelf life dates on aerosol containers of penetrant inspection materials is the final
date that the manufacturer will warranty its product. These products may be used
after this date provided there is sufficient propellant remaining in the container and
they conform to the provisions of process control. Only containers being used to
perform inspections require testing.
The portable inspection process SHALL be periodically observed and checked to verify the following requirements.