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 323 of 460

FED-STD-791D

Method 5414.4

September 30, 1986

RESISTANCE OF GREASE TO FUEL

1. SCOPE

1.1 This method is used for determining the resistance of grease to the solvent

action of fuel.

2. SUMMARY

2.1 The test consists of determining the solubility of the grease in a standard test

fluid, and observing for physical changes caused by an 8-hour immersion in the test fluid.

3. SAMPLE SIZE

3.1 Approximately 4 g of grease to be tested (duplicate 2 g samples).

4. REFERENCE, STANDARDS, AND APPARATUS

4.1 Centrifuge, approximately 650 rpm, swing diameter (tip to tip of whirling

tubes) approximately 40 cm, or equivalent.

NOTE: An equivalent centrifuge must be capable of having its speed adjusted

according to the following formula:

rpm =

* 650

where:

d = diameter (tip to tip) of whirling tubes centimeters

4.2 Shaker, mechanical, stroke approximately 3.8 cm (1-1/2 in), speed

approximately 1350 rpm.

4.3 Centrifuge tube, 200 mL, with stopper.

4.4 Evaporation dish, 100 mL.

4.5 Pipet, 50 mL.

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