MIL-DTL-6000D
4.8.9.1 Fuel immersion (see 3.5.9.1). Hose specimens when subjected to fuel immersion shall meet
the requirements of 3.5.9.1. The following details shall apply:
a. Dumbbell test specimens from the tube shall be suspended in reference fuel B, in accordance
with ASTM D471, at a temperature of 70F to 81°F (21°C to 27°C) for 48 hours.
b. The specimens shall then be removed from the fluid and the tensile strength shall be
determined within 5 minutes in accordance with ASTM D412.
c. Tensile strength calculations shall be based on the original cross sectional area of the test
specimens.
4.8.10 Elongation (see 3.5.10). The ultimate elongation shall be determined in accordance with
ASTM D412 and shall meet the requirements specified in 3.5.10.
4.8.10.1 Ethylene glycol immersion (see 3.5.10.1). Hose specimens when subjected to ethylene
glycol immersion shall meet the requirements of 3.5.10.1. The following details shall apply:
a. Dumbbell test specimens shall be immersed in a solution of 97 percent ethylene glycol, in
accordance with ASTM E1119, at a temperature of 286 to 300 °F (141 to 149 °C) for 70 hours.
b. At the end of the immersion period, the specimens shall be removed from the solution and
cooled in fresh ethylene glycol at room temperature for 30 minutes.
c. The specimens shall then be wiped to remove any ethylene glycol from the surface and
allowed to stand in air at room temperature for 4 hours ±15 minutes before the elongation of
the tube is determined in accordance with ASTM D412.
4.8.10.2 Oil immersion (see 3.5.10.2). Hose specimens when subjected to oil immersion shall meet
the requirements of 3.5.10.2. The following details shall apply:
a. Dumbbell test specimens shall be immersed in oil no. 1, in accordance with ASTM D471, at a
temperature of 244°F to 261°F (118°C to 127°C) for 70 hours.
b. The container in which the test is run shall be fitted with a reflux condenser.
c. At the end of the immersion period, the specimens shall be removed from the oil and cooled in
fresh oil at room temperature for 30 minutes.
d. The specimens shall then be wiped to remove any oil from the surface and allowed to stand in
air at room temperature for 4 hours ±15 minutes before the elongation of the tube is
determined in accordance with ASTM D412.
4.8.10.3 Fuel immersion (see 3.5.10.3). Hose specimens when subjected to fuel immersion shall
meet the requirements of 3.5.10.3. The following details shall apply:
a. Dumbbell test specimens from the tube shall be immersed in reference fuel B accordance with
ASTM D471 at a temperature of 70 to 81 °F (21 to 27 °C) for 24 hours.
b At the end of the immersion period, the specimens shall be removed from the fuel and wiped to
remove any fuel from the surface.
c. The elongation shall be determined within 5 minutes in accordance with ASTM D412.
4.8.11 Crush resistance (see 3.5.11). A section of hose shall be subjected to crush resistance and
shall meet the requirements of 3.5.11. The following details shall apply:
a. Hose sample shall be a 3 inch (7.6 cm) length of hose.
b. The hose shall be allowed to cool at room temperature for at least 4 hours before crush tests
are performed. A force shall be applied at a rate of speed of 1 inch per minute.
c. The inside diameter of the hose shall be measured with a "go or no-go" rod during the time the
force is being applied and shall decrease at least 50 percent of the original inside diameter
when a maximum load of 105 pounds (47.6 kg) has been applied.
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