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)

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

3.3.3.5. During production, one unvulcanized sample will be taken right after mixing on a

monthly basis.

4.7.1.5 Ultimate elongation. This test shall be performed to the requirements of 3.3.3.4.

During production, one unvulcanized sample will be taken on a per shift basis right after mixing.

The results from these tests shall meet the tolerances established from data acquired during

qualification and the tolerances listed in table I.

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

3.3.3.5. During production, one unvulcanized sample will be taken on a monthly basis right after

mixing.

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

3.3.3.4. During production, one unvulcanized sample will be taken right after mixing on a per

shift basis. The results from these tests shall meet the tolerances established from data acquired

during qualification and the tolerances listed in table I.

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

3.3.3.6. During production this test shall be performed on one sample of unvulcanized rubber on

a bi-monthly basis. The results will be compared to the established test results obtained at

qualification.

4.7.1.9 Vulcanization using oscillating disk cure meter. This test will be performed to

the requirements of 3.3.3.7. The test shall be performed as batches of unvulcanized rubber are

finalized (all ingredients have been added and mixed in the compound). Each batch of compound

will be identified and tested.

4.7.1.10 Adhesion. This test shall be performed to meet the requirements of 3.3.3.8.

During production, the test shall be performed on one sample of vulcanized rubber per shift.

4.7.1.11 Compression set. Compression set shall be performed to the requirements of

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

frequency of one sample monthly.

4.7.1.12 Brittleness point of flexible polymers. This test shall be performed to the

requirements of 3.3.3.10. During production, the test shall be performed on unvulcanized rubber

sampled at the frequency of one sample monthly.