MIL-PRF-26385G
4.6 Tests.
4.6.1 Examination. The hose shall be examined to determine that the materials, interface, inner
liner, end cover, outer covering, weight, identification, and interchangeability conform to this
specification.
4.6.2 Leakage. With fittings conforming to AN807 or SAE-AS5132, and secured by a clamp
conforming to NAS397, the hose shall be subjected to a static pressure of 25 psi for 2 minutes.
The hose shall not leak (see 6.8).
4.6.3 Delamination. With one end of the hose capped, a vacuum equivalent to 16 inches of
mercury shall be applied to the hose for 10 minutes. While the vacuum is maintained, the inner
liner shall show no evidence of delamination (see 6.9).
4.6.4 Cleanliness. All surfaces shall be free of visible particulates (50 microns and larger), free
of visible fluorinated lubricants, and free of hydrocarbon contamination to a level not greater
than 3 mg/ft² (see 6.10). Cleanliness of the surfaces shall be demonstrated by industrially
accepted methods and these cleaning and verification methods shall be identified (see 6.2 and
6.10).
4.6.5 Flexibility. The hose shall be coiled and uncoiled around a 1.5 inch diameter rod four
times; after each coiling and uncoiling the hose shall be turned 90° clockwise about its
longitudinal axis. The hose shall have no permanent set.
4.6.6 Elongation. The hose shall be suspended by one end, vertically, and a 60 pound pull shall
be applied for 10 minutes. The length shall increase no more than 16% of the hose length. Two
minutes after removal of the force, the hose shall have no permanent set in excess of 2% of the
hose length.
4.6.7 Static load. A static load of 225 pounds shall be applied to a 4 inch section of the
reinforced portion of the hose, and this force shall be normal to the longitudinal axis. With the
load applied, the outside diameter shall not reduce more than 10 percent. Two minutes after the
load is removed, the reduction of the outside diameter shall be no more than 5 percent.
4.6.8 Flexibility endurance. The hose shall be coiled and uncoiled around a 1.5 inch diameter
rod 500 times. The hose shall then be twisted 180° in both directions about its longitudinal axis
500 times in each direction. The hose shall then be subjected to the leakage and delamination
tests.
4.6.9 Abrasion. Two samples of the hose shall be subjected to the test in FED-STD-191,
Method 5308, dry conditions. A minimum force of 1 pound shall be maintained between the
abradant and hose throughout the test. The reinforced sections of the hose shall withstand 10,000
cycles of abrasion without exposing the reinforced wire (see 6.11).
4.6.10 Odor. Oxygen conforming to MIL-PRF-27210 shall be flowed through the hose at 10
liters per minute for 2 minutes and then tested for odor in accordance with SAE-AS1065.
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