FED-STD-791D
4.9 Microscope, 20-diameter magnification.
4.10 Balance, sensitivity 0.2 mg.
5. MATERIALS
5.1 CAUTION - SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
chemical materials listed in this section must be handled carefully. Federal Test Method
10000, Material Handling Safety Precautions, is a reference which lists all toxic and
hazardous materials cited in FTMS 791. The synonyms, life hazard, flammability,
handling and storage precautions, emergency treatment and measures, and spill practices
of each chemical are explained.
5.2 Emery paper, 00 or finer.
5.3 Litmus paper.
5.4 Petroleum ether (O-E-751) [1,4,0].
5.5 1,1,1-Trichloroethane (methyl chloroform), stabilized (MIL-T-81533) [2,1,0].
5.6 n-Hexane (technical grade) [1,3,0].
5.7 Sodium sulfate, anhydrous (ACS) [u,u,u].
5.8 Copper strip (ASTM B 187/B 187M, ASTM B 272), 16 to 22 gage (B&S),
1.3
5.1 cm.
6. PROCEDURE
6.1 Determine the acid number of the oil by ASTM D 974.
6.2 Determine the kinematic viscosity of the oil by ASTM D 445.
6.3 Heat the oven to the temperature required by the specification.
6.4 Weight (to within 0.5 g) 75 g of the sample and 25 g of distilled water and
place in the clean fluid container (see 4.3).
6.5 Using the filter paper to prevent fingerprints during handling, polish all
surfaces of the copper strip with the fine emery paper.
6.6 Wash the copper strip in warm petroleum ether or n-hexane, dry, and weigh
to within 0.2 mg, and immediately place the strip in the container.
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