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)

4.7.2.2 Hardness. This test shall be performed to the requirements of 3.3.4.2. During

production, one sample per shift shall be taken from the unvulcanized rubber. In addition, one

test shall be performed per shift on a finished component. The results from these tests shall meet

the tolerances established from data acquired during qualification, and the tolerances listed in

table II.

4.7.2.3 Tensile strength. This test shall be performed to the requirements of 3.3.4.3.

During production, one sample per shift shall be taken on unvulcanized rubber after final mixing.

In addition, one sample per week shall be taken from the finished component (replaceable and

integral pads only). The results from these tests shall meet the tolerances established from data

acquired during qualification and the tolerances listed in table II.

4.7.2.4 Tensile strength (aged). This test shall be performed to the requirements of

3.3.4.4. During production, one sample per month shall be taken from the finished component

(replaceable and integral pads only). One sample per month shall be taken from the unvulcanized

rubber (roadwheel path only).

4.7.2.5 Ultimate elongation. This test shall be performed to the requirements of 3.3.4.3.

During production, one sample per shift shall be taken on unvulcanized rubber after final mixing.

In addition, one sample per week shall be taken from the finished component(replaceable and

integral pads only). The results from these tests shall meet the tolerances established from data

acquired during qualification, and the tolerances listed in table II.

4.7.2.6 Ultimate elongation (aged). This test shall be performed to the requirements of

3.3.4.4. During production, one sample per month shall be taken from the finished component

(replaceable and integral pads only). One sample per month shall be taken from the unvulcanized

rubber (roadwheel path only).

4.7.2.7 Tensile stress (modulus). This test shall be performed to the requirements of

3.3.4.3. During production, one sample per shift shall be taken on the unvulcanized rubber after

final mixing. In addition, one sample per week shall be taken from the finished component

(replaceable and integral pads only). The results from these tests will meet the tolerances

established from data acquired during qualification, and the tolerances listed in table II.

4.7.2.8 Thermogravimetric analysis. This test shall be performed to the requirements of

3.3.4.5. During production, this test shall be performed on unvulcanized rubber sampled at the

frequency of one sample bi-monthly.

4.7.2.9 Oscillating disk cure meter. This test shall be performed to the requirements of

3.3.4.6. During production, this test shall be performed on unvulcanized rubber sampled at the

frequency of one sample per batch.