MIL-PRF-19769C(NAVY)
3.5.1.1 Initial tensile strength. Tensile strength shall be 2,500 pounds per square inch (psi), minimum.
3.5.1.2 Initial tensile stress (modulus). Tensile stress at 100 percent elongation shall be as determined.
3.5.1.3 Initial ultimate elongation. Ultimate elongation shall be 250 percent, minimum.
3.5.1.4 Initial hardness. Hardness shall be 75±5 Type A durometer.
3.5.2 After-oven aging. The synthetic rubber material, after having been subjected to the aging test specified in
4.4.7, shall meet the following requirements.
3.5.2.1 Tensile strength. The tensile strength shall be not less than 80 percent of the tensile strength of unaged
specimens.
3.5.2.2 Tensile stress. Tensile stress at 100 percent elongation of aged specimens shall be as determined.
3.5.2.3 Ultimate elongation. The ultimate elongation shall be not less than 60 percent of the ultimate
elongation of unaged specimens.
3.5.2.4 Compression set. The compression set determined by the method specified in 4.4.7.2 shall be not more
then 40 percent.
3.5.2.55 Hardness. The hardness determined by the method specified in 4.4.5 shall be 75±5, Type A
durometer.
3.5.3 Oil immersion. After being subjected to the conditions specified in 4.4.8, the synthetic rubber material
shall meet the following requirements.
3.5.3.1 Swell. The change in volume of the specimen shall be not more than 3 percent when tested as specified
in 4.4.8.1.
3.5.3.2 Tensile strength. The tensile strength shall be not less than 2,000 psi when tested as specified in 4.4.8.2.
3.5.3.3 Tensile stress. Tensile stress at 100 percent elongation when tested as specified in 4.4.8.2 shall be as
determined.
3.5.3.4 Ultimate elongation. The ultimate elongation shall be not less than 200 percent when tested as specified
in 4.4.8.2.
3.6 Specify gravity. The specific gravity of the synthetic rubber material shall be 1.25±0.10 when determined
as specified in 4.4.6.
3.7 Marking. The gaskets shall be marked in accordance with the drawings as specified (see 6.2). In addition,
unit packages shall be marked in accordance with the requirements of MIL-STD-129. The nomenclature shall be the
exact nomenclature for the part or item that has been approved under the contract order.
3.8 Workmanship. The gaskets shall be molded in a manner that will assure compliance with requirements of
this specification. The mold flash shall not exceed 0.003 inch in thickness at the point of contact with the gasket.
The gaskets shall be free of blisters, cracks, folds, foreign material, pinholes, tears, wrinkles, or other imperfections
that affect the serviceability of the gaskets. The gaskets shall not exhibit any knit lines.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
First article inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 First article. First article inspection shall be performed on the gaskets when a first article sample is required
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