FED-STD-791 Lubricants, Liquid Fuels, And Related Products, Testing Method OfThis test method standard is composed of standard test methods for sampling, inspecting and testing lubricants, liquid fuels and related products. It is issued pursuant to the Federal Property and Administration Services Act of 1949, as amended and its application to the purchase of commodities referred to herein is mandatory on all Federal agencies.

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'�NOTE:This draft dated 15 April 2006' by DasH - Page 113 of 460

FED-STD-791D

5.2 Emulsifying agent (distilled water, sodium chloride solution, or synthetic seawater)

as required by the specification.

6. PROCEDURE

6.1 Secure paddle to shaft and connect shaft to stirring motor.

6.2 Preheat and regulate bath to maintain test temperature.

6.3 Pour approximately 40 mL each of sample and emulsifying agent into graduated

cylinder. Immerse cylinder in bath to 85 mL mark, and allow contents of cylinder to reach test

temperature.

6.4 Lower paddle into cylinder so that bottom of paddle is approximately 0.64 cm (1/4

in) from bottom of cylinder. Start stirring motor and allow it to rotate paddle at approximately

1500 rpm for 300 " 15 sec.

6.5 Stop motor, raise paddle from cylinder, and remove emulsion from paddle with stick

or rubber policeman. Return as much of the emulsion as possible to cylinder.

6.6 Allow emulsion to remain undisturbed at the test temperature for the time required

by the specification.

7. CALCULATIONS

7.1 This section is not applicable to the test procedure.

8. REPORTING

8.1 Examine emulsion for any separation, and report whether end product conforms to

specification.

9. PRECISION

9.1 Precision data have not been developed for this method.

Method Prepared By:

Army - AR - 1986

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