MIL-DTL-5521C
4.6.5 Elongation. The elongation test shall be in accordance with Method 2021 of FED-STD-311. The
elongation shall be determined on the same four specimens used for the tensile strength tests and shall
be measured at a stress of 2500 psi (17.24 Mpa). Each of the specimens shall have a minimum
elongation of 24 percent and a maximum elongation of 36 percent before splitting.
4.6.6 Grease. The grease test shall be in accordance with Method 6311 of FED-STD-311. Only one 4
gram test specimen, in accordance with 4.5.3.1.2, shall be tested and shall constitute the sample for this
test.
4.6.7 Chlorides. The chlorides test shall be in accordance with Method 6351 of FED-STD-311. Only one
5 gram test specimen in accordance with 4.5.2.1.2 shall be tested and shall constitute the sample for this
test.
4.6.8 Sulfate. The sulfates test shall be in accordance with Method 6361 of FED-STD-311. Only one 5
gram test specimen in accordance with 4.5.2.1.2 shall be tested and shall constitute the sample for this
test.
4.6.9 Ash. The ash test shall be in accordance with Method 6421 of FED-STD-311. Only one 5 gram
test specimen in accordance with 4.5.2.1.2 shall be tested and shall constitute the sample for this test.
4.6.10 Chromic oxide. The chromic oxide test shall be in accordance with Method 6515 of FED-STD-
311. Only one 5 gram test specimen in accordance with 4.5.2.1.2 shall be tested and shall constitute the
sample for this test.
4.6.11 Low temperature flexibility. Six MS35803-325 washers shall be use for this test:
a. Two shall be aged in MIL-PRF-5606 fluid for seven days at 70° ±1°C (158° ±2°F).
b. Two shall be aged in air for seven days at the same temperature.
c. The remaining two shall be kept unaged.
One washer each of a, b and c shall be subjected to a temperature of -54°C (-65°F) for not less than
96 hours, and one each of a, b and c shall be kept at room temperature for the same period of time.
After the cold soak period, there shall be no appreciable difference in the flexibility of the washers at
-54°C (-65°F) and the washers kept at room temperature.
4.6.12 Firmness. Each individual MS35803 and MS28777 back-up washer during inspection shall be
grasped between the thumb and forefinger as indicated in Figure 2 and rolled one complete revolution of
the cross section under normal hand pressure by a sliding motion of the forefinger relative to the thumb.
When returned to a flat condition after this twisting, the washer cross section shall have maintained a
rectangular shape with the corners true and sharp, and shall show no evidence of flabbiness, peeling,
disintegration or malfunctioning. There shall be no whiskers on the washer as defined in figure 2.
4.6.13 Endurance tests. Finished back-up washers when installed in glands in accordance with MIL-G-
5514 shall be subjected to the applicable performance tests outlined in SAE-AMS-P-5516 except that the
operation pressure shall be 3000 psi (20.68 Mpa).
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