MIL-DTL-13531J
NOTE:
1. The peak shall be at 125% and then level off at 100%.
FIGURE 4. Impulse pressure cycle.
3.6.3 Burst pressure. Hose or hose assemblies when subjected to burst pressure in 4.8.5 shall
withstand, without evidence of leakage, rupture, or detachment of any applicable fittings, the applicable
burst pressures specified in table II.
3.6.4 Low temperature flexibility. Hose or hose assemblies when subjected to low temperature
flexibility in 4.8.6, the latter with a free length between fittings in accordance with ASTM D380, shall
exhibit no cracks in the cover when bent over the applicable mandrel. The specimens shall
subsequently meet the proof pressure requirements in 3.6.5.
3.6.5 Proof pressure. Hose and hose assemblies when subjected to proof pressure in 4.8.7 shall
withstand the applicable proof pressure specified in table II without leakage, rupture or detachment from
a fitting. Fittings shall withstand the applicable proof pressure specified in table II without rupture, crack,
leakage between fittings and hose, or leakage at a threaded junction.
3.6.6 Oil resistance. Hose, inner tube and outer cover, when subjected to oil resistance testing in
4.8.8 shall withstand immersion in oil with their average volume increasing not more than 30% and 100%
respectively.
3.6.7 Ozone resistance. The hose outer cover when subjected to ozone resistance testing in 4.8.9
shall exhibit no cracking when elongated 12.5% and viewed at 7X power magnification.
3.6.8 Fungus resistance. Hose and hose assemblies when subjected fungus resistance testing in
4.8.10 shall exhibit no evidence of fungus growth.
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