MIL-PRF-81322G
3.5 Compatibility. The grease shall be compatible with all previously qualified greases
when tested in accordance with 4.5.3. Immediately after mixing, and after undisturbed storage
for seven days, the mixture shall not form resinous gums, sludge, or insoluble solid materials and
shall comply with the worked penetration and worked stability requirements (see table I). In the
event of failure, the previously qualified grease (unmixed with other greases) shall be tested to
verify that it meets the worked penetration and worked stability requirements under the
conditions specified in 4.5.3. If the previously qualified sample fails to meet the worked
penetration or worked stability requirement, a fresh sample shall be obtained and the
compatibility test repeated. Additional mix ratios of 90 percent previously qualified and 10
percent new and vice versa may be used during qualification testing (see 4.3.1).
3.6 Toxicity. The grease furnished under this specification shall have no adverse effect on
the health of personnel when used for its intended purpose. The grease shall not cause any
environmental problems during waste disposal (see 4.5.5).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. Qualification inspection (see 4.3).
b. Conformance inspection (see 4.4).
4.2 Inspection conditions. Unless otherwise specified, all inspections shall be performed in
accordance with the conditions specified in tables I and II on unworked grease. The physical
values specified in table I apply to the average of determinations made on the sample.
4.3 Qualification inspection. Qualification inspection shall consist of all the tests specified
in table II.
4.3.1 Sampling. Qualification test samples shall consist of a minimum of 6.81 kg
(15.0 lb.) of grease.
4.4 Conformance inspection. The conformance inspection shall consist of the following
tests specified in table II: worked penetration, worked stability, steel on steel wear, oil
separation, odor, low temperature torque, load carrying capacity, evaporation, dropping point,
dirt, corrosiveness (copper strip), and workmanship. The inspection shall be conducted on
samples taken in accordance with 4.4.1.
4.4.1 Sampling for tests. Select two 2.95 kg (6.5 lb.) containers of grease, taken at random
from each filled lot (see 6.4). For users who obtain grease in large containers, samples shall be
selected in accordance with ASTM-D4057. One sample shall be used for tests and the other
shall be retained. If any test result does not comply with the stated requirement, the test in
question shall be repeated on the retained sample: if the sample fails again, the lot shall be
rejected.
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