FED-STD-791D
Method 5415.1
September 30, 1944
RESISTANCE OF GREASE TO WATER AND A 1:1 WATER-ETHANOL
SOLUTION
1. SCOPE
1.1 This method is used for determining the resistance of a grease to the solvent
action of water.
2. SUMMARY
2.1 The test consists of storing two portions of grease, one in distilled water and
the other in an ethyl alcohol-water solution, for one week, and examining the grease for
disintegration.
3. SAMPLE SIZE
3.1 Approximately 4 g of grease to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Containers (2), glass, 250 mL, with stoppers.
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.
5.2 Alcohol, Ethyl, Specially Denatured, Aircraft (A-A-51693).
5.3 Distilled water.
6. PROCEDURE
6.1 Place 200 mL of distilled water into one container, and 200 mL of an
alcohol-distilled water solution (1:1 by volume) into the other.
6.2 Place a single globule of grease (approx. 2 g) into each of the two containers,
stopper the containers tightly, and allow both to stand for one week.
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