MIL-PRF-9117E
instructions. After the curing time specified for the particular test, 1 inch by 6 inch strips
shall be cut from the center portion of the 1 1/2 inch by 6 inch strips and tested.
4.4.3.2 Strip-back test. Strips bonded in accordance with 3.4.1 to be tested shall be
separated by hand at one end of the strip specimen for a distance sufficient to permit the
attachment of the jaws of the testing machine. The free ends of the strips shall be clamped
in the jaws of a pendulum type test machine and pulled apart at an angle of 180 degrees to
each other at a jaw separation rate of 2 inches per minute. The first and last inch of the
bonded section shall not be considered in the test. The average constant peak load of each
specimen shall be recorded. If any sample falls below the minimum requirement the
adhesive shall be rejected.
4.4.3.3 Exposure to aromatic fuels After preparing three samples as described in
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paragraph 4.4.3.1 with bond strength as specified in 3.4.2, the samples will be air cured for
at least 24 hours at standard conditions before cutting to test size. The samples shall then
be fully immersed in standard test fluid conforming to Type III of TT-S-735 for 7 days.
After immersion, the strip-back test, 4.4.3.2, shall be conducted. If any sample tested falls
below the minimum requirement the adhesive shall be rejected.
4.4.4 Storage stability One unopened container of adhesive shall be placed in an oven,
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maintained at a temperature of 120 2° F, and allowed to age 4 weeks. The adhesive
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shall then be cooled to standard temperature and tested.
4.4.4.1 Visual examination The adhesive shall conform to the requirements listed in
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paragraph 3.6 after aging.
4.4.4.2 Bond strength. Contingent upon passing the visual examination of 4.4.4.1, three
samples shall be prepared in accordance with paragraph 4.4.3.1 using aged adhesive and
tested for bond strength per paragraph 4.4.3.2. Any failure to meet the requirements of
paragraph 3.4.3 shall constitute failure of the material.
4.4.5 Heat resistance
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4.4.5.1 Sample preparation Three specimens shall be prepared for testing in the
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following manner. Using strips of the standard NBR-H stock, a lap joint shall be made in
such a way that the area bonded is 1 square inch. The surfaces shall be cleaned with a
suitable solvent prior to application of two coats of the adhesive with wait times per the
manufacturer's recommendations. The adhesive will be allowed to air cure as specified by
the manufacturer, and then reactivated per the manufacturer's instructions. The bond shall
be made within one minute after reactivating, appropriate pressure applied as specified by
the manufacturer and air cured at least 18 hours at room temperature before testing.
4.4.5.2 Heat resistance test The cured samples as specified in 3.5 shall be placed in a
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dry-air oven and aged for 24 hours at a temperature of 158 2° F. The bond shall then be
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subjected to a continuous dead-weight shear load of 2 pounds while maintained at the
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