TM 1-1520-253-23
Task
Description
a. Preparation of Part:
Refer to Preparation of Part of Area for NDI, paragraph 1.4.4.
b. Precleaning Procedure:
Refer to TM 1-1500-344-23.
c. Penetrant Application:
The penetrant may be applied by brushing, spraying, or dipping.
d. Penetrant Dwell:
Allow a minimum of 30 minutes dwell time to a maximum of
240 minutes. Extended dwell time may require rewetting of parts.
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.
f. Rinse:
Rinse the part by waterwash using a low-pressure spray
(pressure not to exceed 40 PSIG) and a temperature of
16 to 38 (60 to 100 ).
C
C
F
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
(140F) 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 dry-
ing 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.
h. Inspect:
Perform inspection under black light.
i. Materials:
Type I, Method B, Level 3 or 4 (post emulsifiable-lypophilic)
Penetrant (see Table 1-8).
