MIL-PRF-46846D
shall then be measured and recorded as the retracted length. Expansion and retraction shall be
calculated as follows:
Expansion % = (extended length - 1) x 100 percent
Retraction % = extended length - retracted length x 100
percent extended length - 1
4.5.3 Dimensional recovery and longitudinal change. Five specimens (see 4.4.1.2) shall be
measured for dimensions as supplied, conditioned for 10 minutes in an oven at a temperature of
175 5°C for type I class 2, types II, IV, and VI classes 1 and 2, and 200 + 5°C for type III
classes 1 and 2, cooled to room temperature and then remeasured. Tubing specimens shall be
measured for length 0.03125 before and after conditioning, and longitudinal change shall be
calculated as a percentage of the original length (see 3.5.1 and 4.4.2.3.3).
4.5.4 Heat shock. Three test specimens (see 4.4.1.2) of each lot shall be conditioned in an
oven as specified in table II or III. The oven shall have an air velocity of 100 to 200 feet per
minute past the specimens. While at the conditioning temperature and upon removal, the
specimens shall be examined for evidence of dripping, flowing, or cracking.
4.5.5 Heat aging. Three specimens (see 4.4.1.2) shall be conditioned in an oven as
specified in table II or III. The oven shall have an air velocity of 100 to 200 feet per minute past
the specimens. After conditioning, the specimens shall be removed from the oven, cooled to
room temperature, and tested as specified in table II or III.
4.5.6 Solvent resistance. The solvent resistance tests for the types and classes specified in
3.7 shall be performed by completely immersing three specimens (see 4.4.1.2) in each of the
following solvents for 24 + 2 hours at 25 + 2°C. The volume of solvent shall be not less than 20
times that of the combined specimens.
a. JP-4 fuel
b. Hydraulic fluid conforming to MIL-PRF-5606
c. Lubricating oil conforming to MIL-PRF-7808
d. Aviation gasoline 100/130
e. Water (tap)
After immersion for the specified time, the specimens shall be lightly wiped and air-dried for 30 to
60 minutes at immersion temperature. The specimens shall then be examined for evidence of
decomposition, swelling, or tackiness before being subjected to the tensile strength and elongation
tests specified in table II or III.
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