FED-STD-791D
5.2 n-Hexane, ACS grade [1,3,0].
5.3 Oleic acid, USP grade [0,1,0].
5.4 Petroleum ether (O-E-751) [1,4,0].
6. PROCEDURE
6.1 Perform the test as follows:
a. Weigh 3 to 5 g of the grease to be tested to the nearest mg and distribute
as a thin layer in a 125 mL Erlenmeyer flask prior to adding 90 mL of a
50-50 mixture by volume of n-hexane and oleic acid. (See Note 1).
b. Warm the flask for approximately 1/2 h on a steam bath with occasional
agitation until all lumps have disappeared and the molybdenum disulfide
is dispersed.
c. Filter the contents of the flask through a previously prepared and weighed
(to the nearest mg) Gooch crucible. Wash the flask and crucible with
approximately 10 mL of a 50-50 mixture by volume of oleic acid and
n-hexane, followed by three washings with petroleum ether. (See Note 1.)
NOTE 1:
Caution. n-Hexane and petroleum ether are both toxic and flammable. Do
not breath their fumes nor allow them to come in contact with the skin.
Keep flames away from the n-hexane and petroleum ether.
d. Dry the crucible and contents at 100C for 1/2 h, cool in a desiccator to
room temperature and weigh. (See Note 2).
The purity of MoS2 powder may be determined in accordance with test
NOTE 2:
method No. 3710 or by means of spectrochemical analysis.
7. CALCULATIONS
7.1 Calculate the percentage of molybdenum disulfide as follows:
Increase in weight of crucible
Percent molybdenum disulfide (as insoluble matter) =
* 100
weight of sample
8. REPORTING
8.1 Report the percent molybdenum disulfide as insoluble matter.
8.2 n-Hexane, ACS grade [1,3,0].
8.3 Oleic acid, USP grade [0,1,0].
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