Table 1-4. Penetrant Procedure (Type I, Method B)
a. Preparation of Part:
Refer to Preparation of Part of Area for NDI, paragraph
b. Precleaning Procedure:
Refer to TM 1-1500-344-23.
c. Penetrant Application:
The penetrant may be applied by brushing, spraying, or
d. Penetrant Dwell:
Allow a minimum of 30 minutes dwell time to a maximum of
240 minutes. Extended dwell time may require rewetting
e. Emulsifier Application:
The emulsifier may be applied by dipping or spraying. The
preferred method of application is by dipping the part in
the emulsifier. Do not permit emulsifier to remain on the
part over 3 minutes.
Rinse the part by waterwash using a low-pressure spray
(pressure not to exceed 40 PSIG) and a temperature of
16°C to 38°C (60°F to 100°F).
g. Drying/Developer Operation:
If a dry nonaqueous developer is to be used, first dry the part
in a drying oven at a temperature not to exceed 60°C
(140°F) until dry. Then apply the developer. If an aqueous
developer is to be used, then submerge the part in the de-
veloper solution immediately after washing. Follow by
drying the part in a drying oven as mentioned above. In
either case, parts shall be removed from the drying oven
as soon as they are dry.
Perform inspection under black light.
Type I, Method B, Level 3 or 4 (post emulsifiable-lypophilic)
Penetrant (Refer to Table 1-8).