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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 76 of 460
FED-STD-791D
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percentage loss = W  b W  a * 100
Wb
where:
Wb = weight of sample before heating.
Wa = weight of sample after heating.
8. REPORTING
8.1 Report the following:
a. Visual appearance of fluid and test cell.
b. Average change of acid or base numbers of the duplicate tests.
c. Average change in kinematic viscosity at 37.8�C (100�F) of the duplicate tests.
9. PRECISION
9.1 Precision data have not been developed for this method.
Method prepared by:
Navy - NAPC - 1986
75



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