FED-STD-791D
Method 3465.1
September 30, 1986
STORAGE STABILITY TEST OF FLUIDS AND LUBRICANTS
1. SCOPE
1.1 This method is used for determining the storage stability of aircraft turbine
lubricants and hydraulic fluids. It consists of storing the lubricant in darkness for 12
months at 23.8 " 3C (75 " 5F), and then inspecting it for changes in homogeneity.
2. SUMMARY
2.1 This method duplicates a typical warehouse environment, and it determines if
12 months of static storage at moderate temperatures can affect product homogeneity by
producing cloudiness, sediment, suspended matter, discoloration, etc. The presence or
absence of observed visual changes in homogeneity is a reliable and economical indicator
of extended storage stability.
3. SAMPLE SIZE
3.1 Approximately 4 L (1 gal) of the lubricant or fluid to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Chamber, constant-temperature 24 " 3C (75 " 5F), free of vibration (such
as caused by heavy traffic).
4.2 Jar, clear-glass, 3.8 L (1 gal), wide-mouth with cap.
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 measures, and spill practices of
each chemical are explained.
5.2 Aluminum foil, commercial grade.
5.3 Scouring powder, commercial grade.
5.4 Distilled water.
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