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MIL-DTL-11891 Track Shoe Sets, Track Shoe Assemblies, Track Shoe Pads And Track Shoe Bushings, Vehicular: ElastomerizedThis specification identifies the requirements for qualification and production control of track systems supporting U.S. Military Tracked Vehicles. This specification is intended primarily for the qualification of elastomeric compounds used in the fabrication of track and track components and to ensure that the quality and performance established at qualification is maintained throughout production. The contractor is held fully responsible for the entire assembly/component including all non-elastomeric components and fasteners.

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MIL-DTL-11891G(AT)
TABLE II. Material property tests.
ASTM
Specification
Tolerance
Test requirement
test method
paragraph
(see note)
Specific gravity
D792
3.3.4.1
+0.020
Hardness
D2240
3.3.4.2
+5 pts
Tensile strength
D412
3.3.4.3
+15%
Tensile strength (aged)
D573
3.3.4.4
+30%
(Change)
Ultimate elongation
D412
3.3.4.3
+15%
Ultimate elongation (aged)
D573
3.3.4.4
+40%
(Change)
Tensile stress (modulus)
3.3.4.3
D412
+15%
@ 200% strain
3.3.4.5
Thermogravimetric analysis
3.3.4.5
E1131
3.3.4.6
Vulcanization using oscillating
3.3.4.6
D2084
disk cure meter
0
Adhesion style A & B
3.3.4.7
D429
ground side pads
0
Adhesion type I & II
D429
3.3.4.7
(roadwheel path)
ACPT/REJ
Ozone resistance
D1149
3.3.4.8
ACPT/REJ
Ozone resistance
None
3.3.4.9
ACPT/REJ
Brittleness point of
D2137
3.3.4.10
flexible polymers
3.5.3
None
GC mass spec
3.3.4.11
ACPT/REJ
None
Blowout test style A
3.3.4.12
NOTE: The contractor shall provide all test results of all lots of elastomeric materials used in
the preparation of all qualification hardware when tested to the requirements of
table II. During production, the contractor will be required to maintain the
production values within the tolerances specified in table II.
3.3.4.4 After age physical properties. Physical property tests, as a minimum, will be
conducted on 3 aged specimens taken from each compound used in the pads (integral and
replaceable) and roadwheel path in accordance with ASTM D573, table II and figures 1, 2, 3,
and 4. Three specimens for each test are required and all results will be reported to the
Government. Accelerated aging shall be conducted for 166 + 2 hours at 158 + 3.60°F or 70 to
72 hours at 212 + 3.60°F. The production tolerance for the percent change of unaged tensile
strength (see 3.3.4.3) to aged tensile strength will not exceed +30 percent. The tolerance for the
percent change of the unaged elongation (see 3.3.4.3) to the aged elongation will not exceed
+40 percent (see 4.7.2.4 and 4.7.2.6).
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