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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 301 of 460
FED-STD-791D
A = AN  2 - AN  1
where:
A = change in acid number
AN2 = final acid number
AN1 = original acid number
7.4 Change in viscosity:
-
C = V  2 V  1 * 100
V1
where:
C = change in viscosity
V2 = final viscosity in centistokes
V1 = original viscosity in centistokes
8. REPORTING
8.1 Report as corrosiveness stability the change in weight of each of the metal
squares in mg/cm2 and the appearance of each of the metal squares.
8.2 Report as oxidation stability of the fluid the result of the insoluble gummy
material inspection, the change in acid number, and the change in viscosity.
9. PRECISION
9.1 Precision data have not been developed for this method.
Method Prepared by:
Army - ME - 1986
300



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