MIL-DTL-45301E
4.9 Operating requirements verification.
4.9.1 Performance test.
4.9.1.1 Physical properties. To determine conformance to 3.5.2, physical properties
specified in table III shall be determined on specimens cut from the platen press sheets specified in
4.6.3. Tests shall be in accordance with ASTM methods as specified in table VII. Curing tests
may be substituted with a certification from the contractor that any elastomer failing to meet the
requirements of 3.6.1 will be replaced at no cost to the Government.
TABLE VII. Test methods for physical properties.
Physical property
Method number
Hardness
ASTM D1415 or ASTM D2240
Tensile strength
ASTM D412
Elongation, ultimate
ASTM D412
Tensile stress, (modulus)
ASTM D412
Accelerated aging of tensile and
ASTM D573
elongation (air heat test, air
heating medium)
Specific gravity
ASTM D792
Ozone resistance test (resistance to ASTM D518 & ASTM D1149
surface cracking of stretched
elastomer compounds)
Low temperature flexibility test
ASTM D2137, Method A
Mooney viscometer test (Viscosity
ASTM D1646
and curing characteristics of
elastomer by shearing disk
viscometer)
4.9.1.2 Adhesion.
4.9.1.2.1 Apparatus. To determine conformance to 3.5.3, a tension testing machine
having a power-actuated clamp shall be used to apply and measure the force required to strip the
tire from the metal wheel or rim to which it is adhered. The clamp shall travel at a rate of 6 in.
(152 mm) per minute. The machine shall be provided with means for accurately measuring the
applied tension. A hub and spindle assembly shall be provided for mounting the tire and
permitting it to rotate fully about a fixed axis.
4.9.1.2.2 Procedure. The tire shall be prepared for testing by cutting down to the metal
wheel or rim circumferentially along its edges on both sides to minimize tearing. The tire shall
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