MIL-PRF-19769C(NAVY)
TABLE I. First article examinations and tests.
Factor Evaluated
Requirement
Examination or Test
Examinations
Dimensions
Tolerances
Marking
Workmanship
Initial Properties
Tensile strength
Tensile stress (modulus)
Ultimate elongation
Hardness
Specific gravity
Properties After Oven Aging
Tensile strength
Tensile stress
Ultimate elongation
Compression set
Hardness
Properties After Oil immersion
Swell
Tensile strength
Tensile stress
Ultimate elongation
4.2.1 First article samples and tests. The gaskets and sheets submitted for first article examinations and tests
shall be certified to have the same composition, construction, and manufacturing process as the material to be
supplied on subsequent lots. When specified (see 6.2), the supplier shall prepare a first article test report.
Production of the gaskets by the supplier prior to approval of the procuring activity or the completion of first article
examinations and tests shall be at the supplier's risk.
4.2.2 Samples for examinations. A representative sample of five gaskets shall be manufactured using the
methods and procedures proposed for production. These shall be evaluated for conformity to the requirements of
the contract, specifications, drawings, and the examinations in table I by an activity approved by the procuring
activity. Gaskets from batches passing first article tests are suitable for delivery.
4.2.3 Samples for physical property tests other than compression set. Sufficient sheets, 6 inches by 6 inches in
plan and 0.080±0.010 inch thick, shall be molded from first article sample stock with an equivalent cure. The sheets
shall be tested as specified in table I for initial properties, properties after oven aging (except compression set), and
properties after oil immersion. Samples shall be cut from these sheets as required, including three swell samples
nominally 1 inch by 2 inches in plan dimensions.
4.2.4 Samples for compression set test. Three compression set samples shall be cut from molded rubber. The
rubber shall be molded from first article sample stock with an equivalent cure. The samples shall be in accordance
with ASTM D395 Type 1 specimens.
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