MIL-DTL-28693A
g. The nonvolatile residue shall be determined from the extract in accordance with ASTM D381,
except that the evaporation time shall be 45 minutes.
h. The weight of the residue shall be expressed as percent of the original weight of the
specimen.
4.7.9.8 Phosphate plasticizer test (see 3.4.2.8). Phosphate plasticizer shall be determined
qualitatively when tested in accordance with FED-STD-601, method 15825 and shall meet the
requirements of 3.4.2.8. The following details shall apply:
a. Using a small piece of clean sodium about the size of a pea, a test tube about 3 inches (7.6
cm) long, and the specimens of the residue remaining after the nonvolatile extractable
material test specified in 4.7.9.7.
b. The procedure shall be repeated if phosphorus is found, omitting addition of the nonvolatile
extractable material in order to determine whether phosphorus was present in any form in
any of the reagents used.
4.7.9.9 Resistance to ozone (see 3.4.2.9). A sample of the cover shall be tested for ozone
resistance in accordance with ASTM D518, method B, and ASTM D1149, except that after conditioning
for 24 hours in a ozone-free atmosphere, the looped sample shall be exposed to 166 ±1/2 hours at
100°F ±2ºF (37.8°C ±1.11°C) to an atmosphere containing 100 parts of ozone per hundred million parts
of air by volume. The sample shall meet the requirements of 3.4.2.9.
4.7.9.10 Low temperature bend test (see 3.4.2.10). Buffed specimens of tube and cover shall be
subjected to the low temperature bend test in accordance with ASTM D380. The test specimens shall
be held at -25°F ±2ºF (-31.7°C ±1.11°C) for 72 hours prior to flexing. Evidence of cracking of the test
specimens shall be cause for rejection.
4.7.10 Hose support ring test (see 3.6.9). Hose support ring test for the 6-inch (15.2 cm) hose
couplings will be based on the following test:
a. Using a universal tensile testing machine, a tensile testing harness will be prepared so that
the bearing surface for the ring is circular having a maximum diameter of 6.89 inches (17.5
cm).
(1) The bearing surface shall be held the testing machine so that when loaded it will not
rotate or skew to one side.
(2) A swivel hook with a latch (with a working load rating of 4 tons (3.63 Mg)) will be
attached to one of the line attachment points on the ring.
(3) The swivel will be attached to a 2-foot (61.cm) long, 5/8-inch (15.88 mm) wire rope sling
using a shackle (with a working load rating of 4 tons).
(4) The other end of the sling should be attached to the testing machine in a safe and
appropriate manner.
b. Gradually load the ring to 6,000 lbs (2.72 Mg). Gradually release the load. Repeat this
operation nine additional times (total of 10 complete cycles).
c. Load the ring to 6,000 lbs (2.72 Mg) and hold the load for 15 minutes.
d. Release the load and examine the ring.
e. Measure the change in the inner diameter of the ring. The change allowed shall be in
accordance with 3.6.9.
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