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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 216 of 460
FED-STD-791D
100 (A + B)
Percent insolubles =
W
where:
A = increase in weight of Gooch crucible.
B = increase in weight of centrifuge tube.
W = original weight of oil sample.
8. REPORTING
8.1 Report the following:
weight change of the metal strip before brushing.
a.
b.
weight change of the metal strip after brushing.
change in acid number of the sample.
c.
d.
acid number of the water layer after hydrolysis.
e.
change in viscosity of the oil.
f.
weight of insolubles formed during hydrolysis.
g.
color of the oil after hydrolysis.
h.
general appearance of the sample after hydrolysis.
9. PRECISION
9.1 Precision data have not been developed for this method.
Method Prepared By:
Army - AR - 1986
215



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