MIL-PRF-22019E
d. Immediately after insertion into the VIA test apparatus, each specimen shall be blown free
of dust using a short burst from a self pressurized can of 1,1,1,2 tetrafluoroethane.
e. After eliminating the plug with the most corrosion spots, the remaining three plugs shall
meet the requirements in table I.
2/ Both orientations of the film shall be tested and both shall meet the requirements in table I.
3/ Samples shall be tested at both room temperature and 160 °F.
4/ Samples shall be held one inch away from the legibility standard.
5/ Oil conforming to ASTM-D471 (IRM 903 oil) and a di-2-ethylhexyl sebacate synthetic oil
shall both be used.
4.6.2 Seam strength.
4.6.2.1 Seam strength samples. Eight type I samples or 4 type II samples measuring 6 by
12 inches shall be randomly selected from the test material. For type I, both heat sealed and
impulse sealed samples shall be tested.
4.6.2.2 Seam strength "as received".
4.6.2.2.1 Preparation of test specimen. The samples for this test shall be folded in half with
the crease parallel to the long axis. The open or unfolded length shall be sealed. After 1 hour,
the folded length shall be cut off ½-inch from the end. From each of the samples, three adjacent
1-inch-wide specimens shall be cut from the center of the sample and perpendicular to the
heat-seal. Each of the three sealed specimens shall then be laid on a horizontal surface. A
beveled (45 ± 5 degrees) plastic straight edge shall be slid between the unsealed ends of the
specimen and held against the seal. On the outside of the specimen, the position of the straight
edge against the seal shall be marked using a fine ball point pen.
4.6.2.2.2 Test at room temperature. The three marked 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 3½-pound weight for type I and a ½-pound weight
for type II 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 sealed faces. The beveled straight
edge shall be slid to the seal as before and the position of the straight edge marked. The distance
between the two pen lines shall be measured to the nearest 1/32 of an inch to indicate seam
separation. Any evidence of delamination of one ply away from the other in the sealed area shall
be cause for rejection.
4.6.2.3 Seam strength (sealed after aging).
4.6.2.3.1 Test specimens. The specimens for this test, in the flat unsealed condition as
taken from the sample roll shall be aged in a circulating air oven maintained at 160 + 2 °F for 12
consecutive days (288 hours). After removal from the oven, the unsealed sections shall return to
room temperature. Test specimens shall then be obtained as specified in 4.6.2.2.1.
4.6.2.3.2 Test at room temperature. The three 1-inch-wide specimens selected for this test
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