MIL-PRF-27617G
4.2.4 Periodic qualification re-evaluation. The grease shall pass a qualification re-evaluation of a
one-pound sample taken from the first lot of grease processed under a contract or order after the product
has passed the qualification inspection, and at intervals as considered necessary to verify the consistency
of production quality.
4.3 Conformance inspection. Quality conformance inspection shall consist of examination of the
sample-filled containers (see 4.4.3) and testing the sample against all requirements specified in section 3
except for high temperature performance, storage stability, and shock sensitivity with liquid oxygen.
Samples shall be labeled completely with information that identifies the purposes of the sample, name of
the product, specification number, lot and batch number (either a bulk lot or packaged lot - see 6.4), date of
sampling, and contract number.
4.3.1 Sampling. Sampling shall be in accordance with ASTM D4057.
4.3.2 Ozone depleting chemicals (ODCs). The contractor shall certify that ODCs were not used in
the production or processing of the grease.
4.4 Method of inspection and tests.
4.4.1 Inspection. Unless otherwise specified, inspection testing shall be performed in accordance
with 4.4.2 and the contractual requirements.
4.4.2 Physicochemical values. Testing shall be performed in accordance with the applicable
methods specified in Table III and 3.4 through 3.7. Values for the physicochemical properties specified in
section 3 apply to the arithmetic average of the determinations made on the samples for those values that
fall within any stated repeatability or reproducibility limits of the applicable test methods.
4.4.3 Workmanship. The sample grease shall be inspected visually and a suitable portion shall be
worked with a spatula on a glass surface. After working, the grease shall be spread with a straight edge
and observed for uniformity as indicated by a smooth surface.
4.4.4 Film stability and corrosion on steel. Surface ground test panels of 1020 steel which conform
to SAE AMS-5046 and measure 0.32 cm x 5.08 cm x 10.16 cm (1/8 in. x 2 in. x 4 in.) shall be employed.
Aluminum shims that measure 0.04 cm x 2.54 cm x 5.08 cm (1/64 in. x 1 in. x 2 in.) shall be employed as
spacers. The test panels shall be cleaned in hot, dry cleaning solvent that conforms to Type I of MIL-PRF-
680, followed by immersion in petroleum ether (ligroine) that conforms to O-E-751. One of the shims shall
be placed at each end of a panel to provide a test area that measures approximately 5 cm x 5 cm.
Approximately 2 gm of the grease shall be placed in the center of the test panel. Another panel shall be
placed on top and two panels shall be pressed together and clamped to form the test assembly. Grease
that exudes from the test assembly shall be cleaned off with a spatula. The test assembly shall then be
placed in an oven maintained at 100°C (212°F) for one week. Upon removal from the oven, the test
assembly shall be dismantled and the grease shall be examined for indications of hardening, separation,
and evident changes other than color. The area of the test panels that were in contact with the grease shall
be examined for evidence of corrosion.
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