FED-STD-791D
Method 3467.1
September 30 1986
STORAGE STABILITY OF LUBRICATING GREASE
1. SCOPE
1.1 This method covers a technique used for measuring the stability of a
lubricating grease after a definite storage period at an elevated temperature.
NOTE: The storage period and temperature at which the grease is to be stored must
be given in the specification referencing this test method.
2. SUMMARY
2.1 A determination for consistency (unworked and work penetration) is made
after the storage interval and the results compared with data established prior to the
storage interval.
3. SAMPLE SIZE
3.1 Approximately 1 kg of grease, sufficient to fill two standard grease cups
(ASTM D 217) with test sample.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Two standard grease worker cups, grease worker, penetrometer, etc. (ASTM
D 217).
4.2 Oven, gravity - convection.
5. MATERIALS
5.1 CAUTION: SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
chemical materials listed in this section must be handled carefully. Federal Test Method
10000, Material Handling Safety Precautions, is a reference which lists all toxic and
hazardous materials cited in FTMS 791. The synonyms, life hazard, flammability,
handling and storage precautions, emergency treatment and measures, and spill practices
of each chemical are explained.
6. PROCEDURE
6.1 Fill one standard grease worker cup with the test sample and remove excess
grease to insure that the surface of grease is flush with the top of the cup. (Sample for un
worked penetration, see 6.6.)
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