MIL-PRF-83363E
4. VERIFICATION
4.1 Classification of tests. The inspection and testing of the grease shall be classified as
acceptance tests (see 4.1.1).
4.1.1 Acceptance tests. Tests for acceptance of individual and bulk or packaged lots (see 6.7)
shall consist of tests for worked penetration, evaporation, and steel on steel wear at 167°F (75°C) for 2
hours.
4.2 Sampling. Sampling shall be in accordance with ASTM D4057.
4.3 Inspection. Refer to the contract or purchase order for specific inspection requirements.
4.4 Test procedures.
4.4.1 List of test methods. The tests of this specification shall be conducted in accordance with
the applicable test method as listed in table II and other methods as described in 4.4.2 and 4.4.3.
TABLE II. Test methods
Test
ASTM Method
Penetration
D217
Worked stability
D217
Evaporation
D972
Oil separation
D6184
Load wear index
D2596
1
Steel on steel wear
D2266
Low temperature torque
D1478
Note:
1. The test specimen materials, test temperature, and length of tests shall be as specified in Table I.
4.4.2 Storage stability. The penetration after storage shall be determined on a sample of grease
which has been stored at a temperature of 100°F +/- 5°F (38°C +/- 3°C) in a 1-pound (0.454 kg) oil tight
container for 6 months subsequent to the original determination of the penetration. The worked and
unworked penetrations after storage shall be determined in accordance with ASTM D217.
4.4.3 Examination of the product. 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.
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