MIL-DTL-81716A
4.4 Inspection conditions.
4.4.1 Ambient (room or normal) temperature and pressure. Unless otherwise specified, tests
shall be conducted at an ambient temperature of 75 ± 5F (24 ± 2.5C) and at an ambient
barometric pressure of 28 to 32 inches (711.2 to 812.8 mm) of mercury. If tests are conducted at
different ambient conditions, appropriate correction factors shall be applied to the pressure
readings.
4.4.2 Air aging. When required for physical properties tests, air aging shall be in accordance
with ASTM D573, except that specimens shall be aged for 166 ± 1 hours at 158 ± 2F (70 ± 1C).
4.4.3 Oil aging. When required for physical properties tests, oil aging of test specimens shall
be as follows. The fluid and samples to be aged shall be placed in a non-pressurized closed
container or reflux condenser. The test fluid shall not be in contact with any part of the container
cover. The packings shall be suspended in the fluid by a glass or nichrome wire rack and shall
not come in contact with any part of the container. A new batch of fluid shall be used for each
aging test. In all cases the ratio of quantity of fluid to the weight of the seals or material being
aged shall be 20 ml of fluid for every gram of material. Seals or materials shall be loosely
separated in the fluid.
4.4.3.1 Oil aging at 158F (70C) for temperature retraction (4.5.2.6) and extrusion
(4.5.2.11). Aging (fluid) temperature shall be maintained at 158 ± 2F (70 ± 1C) for a period of
166 ± 1 hours.
4.4.3.2 Oil aging at 275°F (135C) for all other oil aging tests. Aging (fluid) temperature shall
be maintained at 275 ± 10F (135 ± 5C) for a period of 72 hours.
4.4.4 Test fluid. Unless otherwise specified the fluid used for all applicable tests under 4.5
shall conform to MIL-PRF-5606.
4.5 Inspection methods.
4.5.1 Examination. The sample packings shall be thoroughly examined to determine
conformance with this specification and applicable drawings for finish, trimming, marking, cross-
sectional dimensions, inside and outside diameters, and all other requirements not covered by
tests.
4.5.1.1 Examination of preparation for delivery. The packings shall be examined to ascertain
that the preparation for delivery conforms to requirements of Section 5 of this specification.
4.5.2 First article tests.
4.5.2.1 Hardness. This test shall be in accordance with ASTM D2240, using ASTM
hardness disc specimens. The test shall be conducted at 75 ± 5F (24 ± 2.5C), and the Shore A
durometer hardness value for the unaged specimen shall be not less than 75 nor more than 85
points. The hardness value for the air aged specimen (see 4.4.2) shall be within -0 and +5 points
of the unaged specimen. The hardness value for the oil aged specimen (see 4.4.3 and 4.4.3.2)
shall be within ± 5 points of the unaged specimen.
4.5.2.2 Tensile strength. This test shall be in accordance with ASTM D1414 using two SAE
AS33931, MS3393-16 packings each for the unaged, air aged, and oil aged tests. The tensile
strength for the unaged specimen shall not be less than 1500 psi (10.34 MPa). The tensile
strength values for the air aged specimen (see 4.4.2) and oil aged specimen (see 4.4.3 and
4.4.3.2) shall be at least 80 percent of the value obtained for the unaged specimen.
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