MIL-DTL-83397B
3.6 Vulcanized joints. Unless otherwise specified by the drawing, contract, or order, the
tensile strength of permitted vulcanized joints shall be a minimum of 20 percent of the strength of
the solid section. The vulcanized joint shall be of the same size as the original molded cross-
section.
3.7 Workmanship. The product shall be manufactured by such processes to meet the
requirements of this specification.
4. VERIFICATION
4.1 Classification of inspection. The inspection and testing of the polyurethane rubber shall
be classified as follows:
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.2 First article inspection. First article inspection shall consist of all the tests specified (see
4.5).
4.2.1 First article test samples. First article test samples shall be nominally .075 inch (1.9
mm) thick sheets, prepared by a method similar to that to be used in making the product, such as,
low pressure injection molded, of sufficient size to allow preparation of the test specimens.
4.2.2 Tests. First article tests. shall consist of all the tests specified in 4.5.
4.3 Conformance inspection.
4.3.1 Sampling for inspection. Sampling for conformance inspection shall be in accordance
with ASQ Z1.4, except where otherwise indicated herein. Conformance tests are required on
final products for all production lots of material.
4.3.1.1 Lot. A lot shall consist of all material of the same identity cured In the same
production run, from the same batch, and submitted at the same time for inspection.
4.3.1.2 Batch. A batch shall be quantity compounded in a mixer at one time.
4.3.2 Conformance test samples. Whenever possible, the end item, or specimens cut from
the end item shall be used as the sample. If these items are unsuitable for use as test samples,
tests shall be performed on samples from the same lot of identical composition and comparable
state of cure as that of the end item.
4.3 3 Inspection of materials and components. The supplier is responsible for insuring that
materials and components used were manufactured, tested, and inspected in accordance with
referenced subsidiary specifications and standards to the extent specified, or if none, in
accordance with this specification. In the event of conflict, this specification shall govern.
4.3.4 Inspection of the end item. Examination of the end item shall be in accordance with
the classification of defects, inspection levels, and acceptance quality levels (AQL' s) set forth
herein. The lot size, for the purpose of determining the sample size in accordance with ASQ
Z1.4, shall be expressed in units of parts for examinations as specified (see 4.3.4.1 and 4.3.4.2).
4.3.4.1 Examination for defects in appearance and workmanship.
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