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 371 of 460

FED-STD-791D

5.4 Petroleum ether (60� - 90�C)[1,4,0].

5.5 Platers wax [u,u,u].

5.6 No. 30 grit aluminum oxide.

5.7 Purified crystalline nickelous chloride (NiC12)[u,u,u].

5.8 Reagent grade hydrochloric acid (HC1)[3,0,0].

5.9 Reagent grade crystalline chromium trioxide (Cr03)[u,u,u].

5.10 Reagent grade crystalline silver nitrate (AgNO3)[u,u,u].

5.11 Reagent grade barium carbonate (BaCO3)[u,u,u].

5.12 Hydrochloric acid [3,0,0].

5.13 Nickel bar stock [u,u,u].

5.14 Sheet lead [u,u,u].

5.15 Standard reference oil to be obtained from USAF Aero Propulsion Lab,

AFWAL/POSL, Wright-Patterson AFB, OH 45433-6563 [u,u,u].

6. PROCEDURE.

6.1 Operating Conditions

6.1.1 Throughout the entire test, the test gear temperature is controlled at 220� 

2.8�C (428�  5�F), or the value required by the applicable lubricant specification. Table

1 presents a list of additional operating conditions which are also controlled within the

limits specified. With the tester operating within the specified limits, the test gears are

loaded first to 34.5 kPa gage (5 psig) load oil pressure (nominal 230 lb/in tooth load), and

then at successive increments of 34.5 kPa gage (5 psi). The duration of each loading

period is 10 min  5 s. At the end of each ten-minute loading period, the tester is stopped

and each tooth of the narrow test gear is examined to determine the percent of tooth area

scuffed.

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