MIL-DTL-13531J
4.8.9 Ozone resistance (see 3.6.7). A specimen of hose when subjected to the ozone test in
accordance with ASTM D380 shall meet the requirements of 3.6.7. The following details shall apply:
a. Exposure time shall be for a period of 168 hours at a temperature of +100°F ±2°F (37.78°C
±1.11°C) to an ozone concentration maintained at 50 ±5 parts of ozone per hundred million
parts of air.
b. The specimen shall be examined daily for cracking, with a 7X magnification and without
magnification, except area covered by tape or twine.
c. The first observable cracking shall be recorded.
d. After required exposure to ozone, the specimen shall again be examined with 7X magnification
to determine conformance to 3.6.7.
4.8.10 Fungus resistance (see 3.6.8). Specimens of hose when subjected to the fungus resistance
test in accordance with MIL-STD-810, procedure I shall meet the requirements of 3.6.8. The following
details shall apply:
a. Test specimens shall consist of six hose assemblies, each with hose length between fittings of
not less than 24 inches (0.61 m).
b. Two specimens shall be subjected to the proof pressure test (see 4.8.7) after each of the
incubation periods (30, 60 and 90 days) to determine conformance to 3.6.8.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house
contractor personnel, these personnel need to contact the responsible packaging activity to ascertain
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activities within the Military Service or Defense Agency, or within the military service's system
commands. Packaging data retrieval is available from the managing Military Department's or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
6. NOTES
(This section contains information of a general or explanatory nature which may be helpful, but is not
mandatory.)
6.1 Intended use. Hose and hose assemblies covered by this detail specification are intended for
use in medium and high-pressure hydraulic systems at temperatures between -65°F to +200°F
(-53.89°C to +93.33°C). These hoses and hose assemblies are not for aircraft applications.
6.1.1 Military unique rationale. The hose and hose assemblies covered by this specification are
military unique because they must be able to operate satisfactorily in temperatures ranging from -65°F to
+200°F (-53.89°C to +93.33°C). Commercial components are not designed to withstand these extreme
conditions or sudden environmental changes and would experience catastrophic failure.
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