MIL-DTL-45301E
cut from overhanging edges and plied together to prepare Mooney test specimens 0.25
in. (6.4 mm) in thickness and 1.75 in. (44.5 mm) in diameter.
3.5.5 Resistance to separation. When assembled, the roadwheel (tire) shall withstand
48 hours continuous running at 10 mph (16 km/h) on a rotating steel wheel drum without
evidence of cracking, chunking, blowout, separation, blistering, contamination, porosity,
delamination or lack of adhesion. Any undercutting shall be not in excess of 0.25 in. (6.35 mm)
deep (see 4.9.1.4 and 6.6).
3.6 Ownership and support requirements.
3.6.1 Storage life.
3.6.1.1 Classes 1, 2, 3 and 5. Tread elastomer shall be capable of being stored for a
minimum period of 6 months after date of manufacture without any evidence of pre-curing,
provided storage has complied with all the following conditions (see 4.10.1.1):
a. The materials have been protected from physical damage during the storage
period.
b. The ambient air temperature during storage has been within the range of 40°F
(4°C) to 90°F (32°C).
c. The average ambient air temperature during storage has not exceeded 70°F
(21°C).
3.6.1.2 Classes 4 and 6. Tread elastomer shall show no pre-curing for two years after the
date of manufacture when the unmixed sheets or materials are stored in separate containers,
protected by suitable material applied by the manufacturer and under normal inside storage
conditions (see 4.10.1.2).
3.6.2 Workmanship. Workmanship shall be such as to produce tread elastomer which
will be free of foreign materials, cracks, blisters, or folds. Mixing of compound formulation shall
be complete and of the best commercial practice to adequately disperse all ingredients of the
formula (see 4.10.2).
3.7 Operating environment requirements.
3.7.1 Mooney viscometer samples for accelerated aging for classes 1, 2, 3 and 5 tread
elastomer. The unvulcanized tread elastomer shall meet the after aging Mooney requirements
specified in table IV (see 4.11.1).
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