MIL-DTL-3060G (AR)
4.4 Test methods and procedures.
4.4.1 Film thickness and paint adhesion. The method of test shall comply with applicable
requirements of TT-C-490. The test shall be performed on three randomly selected surfaces of each unit
of the sample.
4.4.2 Corrosion resistance . The method of test shall be as specified in ASTM B117 Method of
Test for Salt Spray (FOG) Testing.
4.4.2.1 Assembled Box Corrosion Resistance. Using a sharp instrument, (machinist scriber or
equivalent) one vertical line approximately three (3) inches long shall be scored across the flat portion of
each side, the bottom, the hinge end, and the cover. The sample shall be positioned so that the hinged
edge of the assembled box is elevated approximately 15 degrees from the horizontal and rests upon a
wooden support while the cover face is parallel to the principal direction of horizontal flow of fog through
the chamber. After salt spray testing, the scribe shall be evaluated according to ASTM D1654.
4.4.2.2 Test Panel Corrosion Resistance. Three (3) 4 X 6 inch test panels shall be prepared in
accordance with 3.3.1 using the same steel and the same coating process used to manufacture the
assembled box. Using a sharp instrument, (machinist scriber or equivalent) one vertical line
approximately three (3) inches long shall be scored across one face of the panel. The panels shall be
positioned on an angle such that scribed surface is coming into contact with the salt solution droplets.
After salt spray testing, the scribe shall be evaluated according to ASTM D1654.
4.4.3 Functioning. The box shall be inspected to assure compliance with requirements of 3.4
through the following procedures:
a. Unlock and lock the cover assembly by hand leverage. Note the locking and unlocking
action on the M19A1 and the M2A1 box assembly for effectiveness and ease of operation. Then only the
M19A1 box assembly shall be unlocked, latch disengaged, and held in an inverted position. The formed
lip inside of each M19A1 box assembly cover skirt shall catch beneath the edge of the body fold and
restrain the cover from opening fully when partially opened box is inverted.
b. Remove and replace the cover assembly. Note any sticking of gaskets to the top edge of
the body assemblies, or any misfit or bind within the body assembly and inspect hinge pins for security in
the body half of the hinge.
c. Remove all cover assemblies. Inspect the gaskets for fit security, cuts, and splits.
d. Environmentally condition the box assemblies as specified in 3.4.3 after conditioning, re-
inspect the box assemblies in accordance with a, b, and c above.
4.4.4 Airtightness of box assembly. The container shall be conditioned to a temperature of not
less than 50°F and ambient pressure prior to testing. The containers shall be tested in accordance with
4.4.4.1. A wetting agent may be used to minimize air bubbles clinging to the exterior surface (see 6.6).
4.4.4.1 Vacuum method. The assembled container shall be tested for leakage by immersing the
closed box, in a vacuum vessel, to a depth of at least one inch below the surface of the water. The air
pressure in the vessel shall be lowered to 3 psi below ambient pressure. Observation for leakage of air
from the interior of the box assembly shall be made during the period of lowering pressure and for a
minimum of 16 seconds while the 3 psi pressure differential is maintained.
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