FED-STD-791D
Method 3458.1
September 30, 1986
LOW TEMPERATURE STABILITY TEST FOR OIL
1. SCOPE
1.1 This method is used for determining the tendency of components of finished
oil blends to be incompatible or to form gels during low-temperature exposure.
2. SUMMARY
2.1 The test consist of refrigerating the sample for 72 h at the temperature
required by specification, and examining it visually for evidence of gelling, separation,
crystallization, and clouding.
3. SAMPLE SIZE
3.1 Approximately 100 mL of oil to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Sample bottle, clear-glass 120 mL, with stopper.
4.2 Cold box, capable of maintaining the specified temperature within "6C.
5. MATERIALS
5.1 CAUTION: SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
materials references and standards 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 Pour sample into bottle, and store bottle for 72 h at the temperature of ("6C)
required by the specification.
6.2 At the end of 72 h, remove the container from the cold box, and immediately
examine the sample visually for evidence of gelling, separation, or crystallization.
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