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.

Pages 1 - - 159 - 160 - 161 - 162 - 163 - 164 - 165 - 166 - 167 - 168 - 169 - 170 - 171 - 172 - 173 - 174 - 175 - 176 - 177|||

'�NOTE:This draft dated 15 April 2006' by DasH - Page 168 of 460

FED-STD-791D

Method 3440.1

September 30 1986

STORAGE SOLUBILITY CHARACTERISTICS OF UNIVERSAL GEAR LUBRICANTS

1. SCOPE

1.1 This method is used for determining the storage solubility characteristics of universal

gear lubricants.

2. SUMMARY

2.1 Universal gear lubricant is heated at 20�C and observed for separation of additive

material after storage at room temperature for a period of 30 days.

3. SAMPLE SIZE

3.1 400 mL (one pint) of the gear oil to be tested.

4. REFERENCES, STANDARDS, AND APPARATUS

4.1 Apparatus.

4.1.1 100-mL cone-shaped centrifuge tubes as specified in ASTM D 96.

4.1.2 Centrifuge with a diameter of swing (tip-to-tip of whirling tubes) 38 to 43 cm (5 to

7 in) and shall be capable of being controlled at a speed of 500 " 25 rpm.

If the available centrifuge does not conform dimensionally to the preferred form,

NOTE 1:

the speed of rotation of the available centrifuge must be adjusted to give the same

centrifugal force at the tips of the tubes as that obtained with the prescribed

instrument when operated at 500 " 25 rpm. The speed to operate the available

centrifuge shall be calculated from the formula:

rpm =

* 1500

where:

d = the diameter of the swing (tip-to-tip whirling tubes) of the available centrifuge in

centimeters.

4.1.3 Balance capable of weighing to one mg.

167