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 VI. Classification of defects - Continued.

Method of

Classification

Defect

inspection

Light/non-fill/

Insufficient material to fill mold, leaving voids or non-

SIE

air check

fill conditions on component. Trapped air, poorly

vented molds, excess mold lubricant can also cause this

defect. Unacceptable on bushings. Allowable

tolerance 1/16 inch max depth and 1/8 inch max length.

Separation

Separation in the rubber or between the rubber and

Visual

adhesives or rubber and metals.

Off-Register

Uneven or misaligned molds causing non-conformity

SIE

to dimensional requirements of the drawing.

SIE

Undercure

Appears as tackiness, softness, porous, loginess, low

hardness or other inferior physical properties. Usually

caused by improper cure conditions or defective

rubber.

Overcure

Vulcanizing to the point that physical property

SIE

(hardness, tensile strength, etc) requirements are

impaired.

Dimensional

Molding that will result in concaveness, convexity or

SIE

non-

other dimensional irregularities of the components to

compliance

meet the dimensional requirements of the drawing or

result in adverse performance of the products.

1/ SIE = Standard Inspection Equipment

4.5.3.4 Packaging and packing.

4.5.3.4.1 Lot formation. A lot shall consist of all packs prepared for shipment in

accordance with one level (see 6.2), from an identifiable production period, from one

manufacturer, submitted at one time for acceptance.

4.5.3.4.2 Sampling for acceptance examination. Sampling for acceptance examination

shall be performed in accordance with table V.

4.5.3.4.3 Examination inspection for packaging and packing. Samples selected in

4.5.3.4.2 shall be inspected as specified by the procuring activity (see 5.1 and 6.2).

4.5.3.4.4 Sample failure. Failure of the sample to pass any specified inspection may be

cause for the Government to refuse to accept the lot until it has been proved to the satisfaction of

the Government that the faults revealed have been corrected.