MIL-PRF-11588H
4.5.6.4 Adhesion after filling. A 12 in. length of the hose shall be suitably stoppered and
filled with aromatic hydrocarbon fluid conforming to ASTM D471, reference fuel B, and
maintained at a temperature of 73.4 +3.6°F ( 23 +2°C) for 48 hours. Ring specimens, as
described in ASTM D413, shall be cut from the 12 in. piece of hose and tested in accordance
with ASTM D413 (machine method) within 15 min after the removal of the test fluid.
Nonconformance to 3.5.6.2 shall constitute failure of this test.
4.5.7 Volume increase. Volume increase test shall be determined in accordance with
ASTM D471. the immersion medium shall be test fluid conforming to ASTM D471, reference
fuel B. The immersion shall be 73.4 + 3.6°F (23 + 2°C) for 48 hours. Nonconformance to 3.5.7
shall constitute failure of this test.
4.5.8 Low temperature flexibility.
4.5.8.1 Relative modulus. To determine conformance to 3.5.8.1, the relative modulus
test shall be made in accordance with ASTM D1053, method A, type B specimen, gaseous
medium. The test temperature shall be -25.6 +3.6F (-32 +2C). The exposure time shall be 7
days. Nonconformance shall constitute failure of this test.
4.5.8.2 Brittleness. To determine conformance to 3.5.8.2, fabricate ASTM slabs of tube
and cover material (6 in. x 6 in. x .080 in.) per ASTM D2137. Condition samples in ASTM
D471, reference fuel B, at 73F (23C) for 4 days. Remove the samples from the fuel and air dry
them for 2 days at 73F (23C). Then oven-age the samples for 24 hours at 130F (54C). Test
the samples after oven-aging in accordance with ASTM D746. Nonconformance shall constitute
failure of this test.
4.5.8.3 Modulus of elasticity. To determine conformance to 3.5.8.3, the modulus of
elasticity shall be determined at -60F (-51C) per ASTM D790, method II, procedure B, on
samples of tube and cover compounds after they have been conditioned in fuel, air dried and
oven-aged as specified in 4.5.8.2. Nonconformance shall constitute failure of this test.
4.5.9 Existent Gum. To determine conformance to 3.5.9, a test sample of hose, not less
than 14 in. long, shall be selected and the bottom plugged with a clean corrosion-resisting steel
cylinder 2 in. long secured in place with a clamp. The sample shall be filled to within 2 in. of the
top with test fluid conforming to ASTM D471, reference fuel B. The top end of the hose shall be
plugged in a manner similar to the bottom. The sample shall then be stored in a vertical position
for 7 days at an ambient temperature of 100 +2°F (38 +1°C). At the end of each 24 hours, the
fuel in the sample shall be agitated for 5 min by moving the hose back and forth from a vertical
to a horizontal position at a rate of 2 cycles per min. At the end of the 7-day storage period, the
fuel shall again be agitated in the sample for 5 min and immediately removed from the hose. The
removed fuel shall be tested for existent gum in accordance with the air-jet solvent wash method
of ASTM D381. A blank shall be run on the test fluid at the same time and by the same method.
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