MIL-PRF-19769C(NAVY)
4.2.5 Rejection for nonconformance. If any of the first article examinations or tests do not conform to the
applicable requirements, this shall be cause for denial to proceed with the production of gaskets.
4.3 Conformance inspection. Conformance inspection shall include the examinations and tests for batch
TABLE II. Conformance examinations and tests.
Factor Evaluated
Requirement
Examination or Test
Batch Acceptance (Initial Properties)
Tensile strength
Tensile stress
Ultimate elongation
Hardness
Specific gravity
Lot Acceptance
Dimensions
Tolerances
Marking
Workmanship
4.3.1 Batch acceptance.
4.3.1.1 Batch. A batch consists of a quantity of rubber compound which is mixed at one time and which is to
be used in the manufacture of the gaskets. If the curing agents are left out for processing purposes, the batch is
referred to as a master batch. It may be subdivided as needed and curing agents incorporated at that time. Each
subdivision shall be considered a batch when curing agents are incorporated.
4.3.1.2 Samples for batch tests. Sufficient sheets nominally 6 inches by 6 inches in plan and 0.080±0.010 inch
thick shall be molded from each batch or subdivision of master batch with an equivalent cure and shall be tested for
the initial properties listed in table II. Three samples shall be tested from each batch or subdivision of a master
batch for initial tensile strength, tensile stress, ultimate elongation, hardness, and specific gravity.
4.3.1.3 Rejection of batch. If the sheets in 4.3.1.2 do not conform to all of the requirements for initial
properties in table II when tested as specified, the batch from which it was molded shall be rejected and not used for
the production of gaskets.
4.3.2 Lot acceptance.
4.3.2.1 Lot. A lot shall consist of gaskets produced in one plant under essentially the same conditions and
offered for acceptance at one time. In each case, the number of gaskets offered for inspection constitutes the lot
size. For purposes of sampling, a lot shall consist of not more than 2,500 pounds of gaskets of the same design and
dimensions produced in one plant under essentially the same conditions.
4.3.2.2 Sampling for lot acceptance. Random samples from each lot of gaskets shall be selected in accordance
with table III for lot acceptance examinations.
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