MIL-DTL-83723/27B
Elastic memory
A 6 x 1/8 inch specimen cut from a molded slab shall be marked with two parallel gage lines 1 inch
apart in the central portion of the specimen. A 2 inch portion of the specimen including both gage
lines then shall be heated for 5 minutes in a 200 ± 5°C (392 ± 9°) oven or equivalent, removed from
the oven, and stretched within 10 seconds until the gage lines are 4 inches apart. The extended
specimen then shall be cooled at room temperature and released from tension. After 24 hours at
room temperature, the distance between the gage lines shall be measured and recorded as the
extended length. The portion of the specimen including both gage lines then shall be reheated for 5
minutes in a 200± 5° (392 ± 9°F) oven or equivalent, removed from the oven, and allowed to retract.
The specimen shall again be cooled to room temperature and the distance between the gage lines
then shall 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 retracted length
X 100 percent
extended length -1
Low-temperature flexibility
A 6 X ¼ inch specimen out from a molded slab shall be mounted in a loop position between movable,
parallel jaws 2 ½ inches apart. Each end of the specimen shall be firmly fastened by at least ¾ of an
inch extending into a set of jaws. The specimen ant the test fixture shall be conditioned for 4 hours
at 55 ± 2°C (-67 ± 4°F). While at this temperature, the jaws shall be moved rapidly from 2 ½ inch to
a 1 inch separation.
Heat shock
A 6-inch by ½ inch specimen cut from a molded slab shall be conditioned in an oven at temperature.
After this conditioning, the specimen shall be visually examined for evidence of dripping, flowing, or
cracking.
Heat aging
Three specimens, prepared and measured in accordance with ASTM D412, shall be
conditioned at temperature for 168 hours in an oven with an air velocity of from 100 to
200 feet per minute past the specimens. After conditioning, the specimens shall be removed from
the oven, cooled to from temperature, and tested for tensile strength elongation.
Fluid resistance
Specimens 6 x 0.25 x 0.075 shall be cut from molded slabs. Three (3) specimens shall be
immersed in each of the fluids specified. The volume of fluid shall be not less than 20 times that of
the specimens. After immersion, the specimens shall be lightly wiped and air dried for 30 to 60
minutes at standard conditions.
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