MIL-DTL-45301E
4.10 Ownership and support requirements verifications.
4.10.1 Storage life.
4.10.1.1 Classes 1, 2, 3 and 5. The contractor shall certify that the requirements of
3.6.1.1 can be met after proper processing and a 6 month storage period.
4.10.1.2 Classes 4 and 6. The contractor shall certify that the requirements of 3.6.1.2 can
be met after proper processing and a 2-year storage period.
4.10.2 Workmanship. Conformance to 3.6.2 shall be determined by examination in
accordance with 4.1.3.4.
4.11 Operating environment requirements verifications.
4.11.1 Accelerated aging for classes 1, 2, 3 and 5 tread elastomer. To determine
conformance to 3.7.1, unvulcanized tread elastomer shall be subjected to accelerated oven aging
for 166 + 2 hours at 158 + 3°F (70 + 2°C). During the oven aging cycle, the test pieces shall be
completely enclosed in cellophane and suspended in the oven. Tests shall be in accordance with
ASTM methods specified in table VII.
4.11.2 Accelerated aging tests for classes 4 and 6 elastomer. To determine conformance
to 3.7.2, tread rubber elastomer shall be subjected to accelerated oven aging for 166 + 2 hours at
158 + 3°F (70 + 2°C). After oven aging, the samples shall be mixed and tested in accordance
with ASTM methods specified in table VII.
4.11.3 Ozone resistance test.
4.11.3.1 Specimens. To determine conformance to 3.5.2 and 3.7.3, the specimen shall be
in accordance with procedure B of ASTM D518 and shall be prepared from tread elastomer, be
finished smoothly, and shall be of uniform thickness in accordance with ASTM D3183, or shall be
prepared from ASTM tensile slabs of certified equivalent cure prepared from production molding
blanks of tread elastomer in accordance with ASTM D3182.
4.11.3.2 Procedure. To determine conformance to 3.7.3, the specimens shall be tested in
accordance with procedure B of ASTM D518, except the length of the clamping strips shall be
such as to facilitate placement within the ozone test chamber. Specimens shall be placed in the
chamber and exposed for 7 days at a temperature of 104 + 3°F (40 + 2°C) in an air-ozone mixture
having an ozone partial pressure of approximately 50 millipascals (mPa) in accordance with
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