FED-STD-791D
e. Pour solution into a sample bottle, and seal it tightly with stopper.
NOTE 1:
For red hydraulic liquids, in place of plain distilled water, use distilled
water containing 200 ppm red dye (National Erie Bordeaux B,
manufactured by National Aniline Division of Allied Chemicals and Dye
Corporation, or equivalent).
6. PROCEDURE
6.1 Clean sample bottles, and dry at approximately 100C for 24 h (min.).
6.2 Pour sample into bottle, and seal bottle tightly with stopper.
6.3 Store sample at the specified temperature for the specified number of hours.
6.4 Before end of storage period, cool the methyl-alcohol-glycerine solution to
-54C (-65F).
6.5 Within 5 min of making comparison, shake turbidity standard vigorously for
10 s, and pour into the other sample bottle.
6.6 At the end of the storage period, remove sample from cold storage and shake
vigorously for approximately 10 s.
6.7 Dip specimen into methyl-alcohol-glycerine solution to eliminate frosting (if
necessary), and within one minute of removal from cold storage, compare sample
visually with turbidity standard.
7. CALCULATIONS
7.1 This section is not applicable to the test procedure.
8. REPORTING
8.1 Report turbidity of sample as less than, more than, or equal to the standard.
Also report any evidence of gelling, crystallization, or solidification of the sample.
9. PRECISION
9.1 Precision data have not been developed for this method.
Method Prepared by:
Army - NADC - 1986
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