MIL-PRF-85036B(AS)
1/ As received and aged, specimens shall be flexed (maximum flexing 6 inches) in accordance
with FED-STD-101, Method 2017, prior to conducting the WVTR test. The specimen shall
be aged by exposure to an atmosphere of 80 to 85 percent relative humidity and 160 ± 2 °F
for 72 consecutive hours.
2/ Conduct tests as specified in FED-STD-101, Method 2017, except that only as received
specimens shall be tested. Prior to flexing, test specimens shall be conditioned for at least 30
minutes at -20 ± 2 °F and the flexing operation shall be conducted at -20 ± 2 °F.
3/ Breaking strength tests shall be conducted in accordance with FED-STD-191, Method 5100.
Tests shall be conducted and the average breaking strength recorded for all as received and
aged specimens in both the machine and cross directions. Aged material shall be material that
has been exposed to an atmosphere of 80 to 85 percent relative humidity and 160 ± 2 °F for
72 consecutive hours. Individual test specimens shall then be cut from the aged sheet.
4/ Three specimens shall be tested. Specimens shall not be suspended but shall be placed on a
horizontal surface.
4.6.2 Seam strength (face to face seal).
4.6.2.1 Seam strength sampling. Samples measuring 6 by 12 inches shall be selected from
the test material as shown on figure 1 (key 1, 2, 3).
4.6.2.2 Seam strength as received.
4.6.2.2.1 Preparation of test specimen. The six sections for this test (see figure 1) shall be
folded in half with the crease parallel to the long axis. The open or unfolded length shall be
heat-sealed by clamping in the sealer and simultaneously drawing a sharp penciled line on the
backing along the edge of the sealer jaw. The folded length shall be cut off 1/2 inch from the end.
From each of the six sections, three adjacent 1-inch-wide specimens shall be cut perpendicular to
the seam (see 4.5). One of the specimens from each section shall be tested at room temperature,
(see 4.4) one from each section tested at 100 °F, and the remaining one from each section tested
at 160 °F. After heat-sealing and prior to the application of the specified weights, the specimens
in all cases shall be exposed for one hour to the test conditions specified in 4.4.
4.6.2.2.2 Test at room temperature. The six 1-inch-wide specimens selected for this test
(see 4.6.2.2.1) shall be opened and one end of each specimen shall be clamped so that the other
end of the specimen hangs freely. A 3 1/2 pound weight shall then be carefully attached to the
free end of the specimen so as not to impact load the seal. The weight shall be allowed to act for
5 minutes, whereupon the weight shall be removed and the specimen examined for separation of
the heat-sealed faces. Any evidence of delamination of one ply away from the other in the
heat-sealed area shall be cause for rejection. The evaluation shall be limited to the heat-sealed
area specified in 4.6.2.2.1.
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