MIL-PRF-22019E
4.6.5.1 Preparation of panel. Three 2 by 4 by 1/8 inch, cold rolled 1010 steel panels with
rounded edges shall be finished and cleaned as specified in the contact corrosivity test (see
4.6.1).
4.6.5.2 Assembly and exposure. The panels shall be placed individually in a 3 by 5 inch
(inside dimensions) pouch fabricated from the material After insertion of the panel, the excess
air shall be exhausted from the pouch by hand, and the pouch sealed. The sealed panels shall
then be exposed outdoors for 12 months in a louvered shed. Upon completion of this exposure
period the panels shall be examined visually for conformance to the long term protection
requirement in table I.
4.6.6 Low temperature flexibility.
4.6.6.1. Preparation of specimens. Cut five specimens, 4 by 12 inches, and condition in a
low temperature cabinet for 3 hours at -25 ± 2 °F. The specimens shall be arranged in the
cabinet in a manner that shall allow circulation of air against all surfaces of the specimens.
4.6.6.2 Test procedure. After conditioning for 3 hours, each specimen shall be drawn over
a ¼ inch diameter round steel mandrel at the conditioning temperature in such a manner that the
specimen is subjected to a 180-degree-bend. The mandrel shall be placed in the low temperature
cabinet ½-hour prior to the flexing operation. This operation shall take 2 to 3 seconds for a
complete draw over the mandrel. Each specimen shall be drawn over the mandrel three times,
and then turned over so that the opposite face is toward the mandrel and the drawing process
repeated as above.
4.6.6.2.1 Alternate test procedure. After conditioning for 3 hours, each specimen shall be
drawn over three ¼-inch diameter round steel mandrels at the conditioning temperature in such a
manner that the specimen is subjected to a 180-degree-bend, followed by a reverse 180-degree-
bend, followed by another 180-degree-bend. This operation shall take 2 to 3 seconds to draw
each specimen over the mandrels. Each specimen shall be drawn over the mandrels three times.
4.6.7 Storage stability. Enough barrier material to conduct the tests indicated below plus
additional material for two retests shall be overwrapped with one layer of MIL-PRF-131, Class 1
barrier material and placed in storage for one year. After one year storage the MIL-PRF-131
barrier material shall be removed, and the barrier material shall be tested for conformance to
seam strength (see 4.6.2), vapor inhibitor ability (VIA) (see 4.6.1), and transparency (see 4.6.1).
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
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