FED-STD-791D
4.4 Stirring apparatus capable of stirring the contents of a 400-mL tall-form beaker at
approximately 200 rpm.
4.5 Beakers, 400-mL capacity, tall form, heat resistant glass.
4.6 Forced circulation oven capable of being controlled at 104 " 2.5C (220 " 5F)
and 121 " 1C (250 " 2F).
4.7 Desiccator capable of holding several centrifuge tubes.
4.8 Graduated cylinders, 250-mL capacity.
5. MATERIALS
5.1 CAUTION: SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
materials references and standards 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 Naphtha, in accordance with TT-N-95B, type II [1,4,0].
Caution, Naphtha is
flammable.
5.3 Cleaning solution, consisting of concentrated sulfuric acid saturated with potassium
dichromate.
5.4 Distilled water.
5.5 Denatured ethyl alcohol.
5.6 Reference oils. Information concerning reference oils can be obtained from:
SAE
400 Commonwealth Drive
Warrendale, PA 15096-0001
6. PROCEDURE
6.1 Make two compatibility tests with each reference oil.
6.2 Determine the residue in each of the reference oils and the sample oil by subjecting
each
of the oils alone (not mixed with any other oil) to the procedures described in 6.7
through 6.15. This data will be used in 7.1.
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