MIL-PRF-3420H
4.5.3.2 Procedure. Fifty ml of a solution of glycerine and distilled water having a specific
gravity of 1.103 at 75 ± 3 °F shall be poured into a wide-mouth glass jar of one pint capacity to
provide a relative humidity of 85 ± 3 percent at 150 ± 2 °F. A glass vessel for use as a stage shall
be inverted and placed inside the jar. The three wrapped panels shall be placed around the
perimeter of the stage with both legs of the inverted "U" resting on the stage in the test jar
avoiding contact with glycerine solution. The test jar shall be sealed with a screw cap using an
aluminum foil gasket and placed in a circulating air oven at 150 ± 2 °F for 7 days. The test jar
shall then be removed from the oven, allowed to cool, and the copper panels removed and
unwrapped. The "U" shaped specimen shall be visually examined on the inside surface of the
"U" for evidence of corrosive effects from the vapor in accordance with ASTM-D130.
4.5.4 Compatibility with MIL-PRF-131. For VCI-treated sheet materials. The test shall be
performed as follows in triplicate for each combination of materials along with a control
incorporating neutral kraft paper in lieu of VCI-treated material.
4.5.4.1 Assembly of specimens. The specimen of MIL-PRF-131 barrier material shall be
formed into a pouch by folding the specimen in half and leaving a 36-pound flat surfaced weight
on the crease for 30 seconds (6 pounds per inch of crease). The short edges shall be sealed to
form a side-opening pouch 5 inches long. A clean dry steel panel 1/8 by 2 by 4 inches shall be
wrapped in a specimen of VCI-treated material with the treated surface toward the panel. The
wrapping shall be closed with a double fold along the lengthwise centerline of the panel, and
single folds at the ends of the panel. The wrapped panel shall then be inserted into the pouch.
The excess air shall be pressed out by hand and the pouch closed with an airtight heat seal.
4.5.4.2 Procedure. Unless otherwise specified, the assembly shall be retained in an oven
maintained at 150 ± 2 °F for 7 days. When the pouch has cooled to room temperature, the sealed
edge shall be cut away and the wrapped panel shall be removed. The MIL-PRF-131 barrier
material shall be examined for deterioration and if none is obvious, the material shall be tested
by bending it with the heat-seal face out around a 1/4-inch-diameter mandrel as prescribed in
MIL-STD-3010, Method 2003.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-
house contractor personnel, these personnel need to contact the responsible packaging activity to
ascertain packaging requirements. Packaging requirements are maintained by the Inventory
Control Point's packaging activities within the Military Service or Defense Agency, or within
the military service's system commands. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files, CD-ROM
products, or by contacting the responsible packaging activity.
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