FED-STD-791D
Method 3459.1
September 30, 1986
LOW TEMPERATURE STABILITY
1. SCOPE
1.1 This method is used for determining the stability (at low temperature) of
finished fluid blends.
2. SUMMARY
2.1 The test consists of storing a sample for the time and at the temperature
required by the specification, agitating it, comparing its turbidity with a standard, and
checking it for evidence of gelling, crystallization, or solidification.
3. SAMPLE SIZE
3.1 Approximately 240 mL of test fluid.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Cooling apparatus, capable of maintaining the specified temperatures.
4.2 Sample bottle (2), clear-glass, 250 mL, with cork 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 Methyl-alcohol-glycerine (technical grade), 1:1 solution (by volume) [1,3,0].
5.3 Turbidity standard, prepared within 30 min of use, as follow:
a. Pour 25 mL of 0.00322 M barium chloride into a 250-mL volumetric
flask [0,0,2].
b. Add 125 mL of 0.050 N sulfuric acid, and shake well to insure
complete precipitation [3,0,2].
c. Add approximately 25 mL of 1 N sodium hydroxide to make solution
alkaline [3,0,1].
d. Add distilled water to bring total volume to 250 mL.
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