MIL-PRF-62136B
examined for the defects in accordance to ZZ-T-1083 and subsequently subjected to the
applicable tests specified in table IV.
4.5.3 Failure. Failure of any sample to pass any of the specified control tests shall be
cause for the Govenment to refuse acceptance of the production quantity represented, until action
taken by the contractor to correct defects and prevent recurrence has been approved by the
Government.
4.6 Foam inflatant compound test.
4.6.1 Compression set test. To determine conformance to 3.2.1.1, samples shall be taken
from the centers of four 1 inch (2.54 cm) thick whole cross sections cut 90 degrees apart from the
test tire measured in accordance with ASTM D2137, Method B.
4.6.2 Uniformity of foam density test. To determine conformance to 3.2.1.2, density of
the foam inflatant shall be measured by water immersion of 20 samples 0.5 cubic inch + 0.1 cubic
inch (8.19 cc + 1.6 cc) volume. Samples shall be taken from four each 1 inch thick whole radial
cross sections cut from the test tire at points 90 degrees apart. Within each of the four foam
inflatant sections, samples shall be taken from three points along the centerline: (a) next to the
rim; (b) next to the liner; and (c) midway between a and b. Two samples shall also be taken next
to the liner along a line perpendicular to the centerline at the widest part of the section.
4.6.3 Low temperature brittleness test. To determine conformance to 3.2.1.3, a sample
strip shall be cut from the foam immediately adjacent to the liner at the tire centerline and parallel
to the tire circumference. This sample shall be subjected to test in accordance with ASTM
D2137.
4.6.4 Tear strength test. To determine conformance to 3.2.1.4, the foam inflatant shall
be tested according to the following procedure:
a. A 6 inch (15.2 cm) by 1 inch (2.54 cm) by ½ (1.27 cm) sample shall be cut parallel to
the tire tread centerline at the section centerline one inch below the liner. The 1 inch
dimension shall be parallel to the cross section centerline.
b. The sample shall be slit in the middle of both ½ inch (1.27 cm) faces along the 6 inch
length to a depth of 1/4 inch (0.64 cm). A tear shall be started from one end by
cutting to a depth of one inch between the two existing 1/4 (0.64 cm) slits at that end.
c. The sample shall be torn from the cut and along the 6 inch (15.2 cm) length on a
suitable test machine. Crosshead speed shall be 20 inches (50.8 cm) per minute and
ambient temperature 74 F (23.3 C).
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