MIL-DTL-17505F
4.7.6 Minimum bend test under pressure. Hose selected shall be subjected to 150 psi (1 034 kPa)
hydrostatic pressure and bent to the appropriate radius specified in table II.
4.7.7 Burst pressure test. A hydrostatic pressure shall be applied equal to four times the working
pressure of 150 psi (1 034 kPa) (600 psi (4 137 kPa)). This pressure shall be attained at a
uniform rate of not less than 300 psi (2 068 kPa) and not greater than 1,000 psi (6 895 kPa) per
minute. The pressure shall then be raised until the hose fails; the pressure at which it fails shall be
recorded.
4.7.8 Kink test. Empty hose when laid out on a flat surface in a curve drawn with a radius as
given in table II, shall attain this curved position without kinking or flattening.
4.7.9 Initial tensile properties. Initial tensile strength and ultimate elongation shall be determined
by the procedure given in ASTM D 412, using specimens cut with die C.
4.7.10 Tensile properties after immersion. The tensile strength and ultimate elongation after
immersion in ASTM D 471 reference fuel B for 70 ± 0.50 hours at 73 ± 4 degrees Fahrenheit (°F)
(23 ± 2 degrees Celsius (°C)) shall be determined in accordance with ASTM D 471, using
specimens cut with die C of ASTM D 412. Tensile strength shall be based on the swollen cross
sectional area of the specimen.
4.7.11 Volume change after immersion. The change in volume of samples of the tube and cover
after immersion in ASTM D 471 reference fuel B for 70 ± 0.50 hours at 73 ± 4 °F (23 ± 2 °C)
shall be determined in accordance with ASTM D 471. The change in volume shall be reported as
a percent of the original volume.
4.7.12 Accelerated aging of compounds. The resistance of the tube and cover to accelerated
aging shall be determined in accordance with ASTM D 573, using specimens cut with die C of
ASTM D 412, except that the time of aging shall be 70 ± 0.50 hours at 212 °F (100 °C). Tensile
strength and ultimate elongation tests shall be used to determine the amount of deterioration.
4.7.13 Resistance to ozone. The sample of cover stock shall be tested for ozone resistance in
accordance with procedure B of ASTM D 518 and ASTM D 1149, except that after conditioning
for 24 hours in an ozone-free atmosphere the looped sample shall be exposed for 72 hours at
104 ± 4 °F (40 ± 2 °C) to an atmosphere containing 50 parts per hundred million of ozone.
4.7.14 Initial adhesion. The adhesion of the tube and cover to the reinforcement, and of the plies
of reinforcement to each other, shall be determined in accordance with the machine method of
ASTM D 413.
4.7.14.1 Specimens. Strip or ring specimens shall be prepared in accordance with ASTM D 380,
except that the specimen shall be not less than of 8 inches (203 mm) in length. For determining
adhesion between plies of reinforcement, the plies to be separated must be at opposing angles.
Three specimens of each interface shall be tested.
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