FED-STD-791D
4.6 Test tube, approximately 1.5-cm (1/2-in) O.D. by 7.5 cm (3 in) long, with
stopper.
4.7 Steam bath (to accommodate evaporating dish).
4.8 Oven, approximately 100C (212F).
4.9 Balance, sensitivity 0.2 mg.
4.10 Spoon type spatula.
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 Standard Test fluid (ASTM D 471, Type III).
5.3 Aluminum strip (ASTM B 209), 5.08
1.3
0.04 cm.
6. PROCEDURE
6.1 Determine the solubility of the sample in the standard test fluid as follows:
a. Clean, dry and weigh a centrifuge tube to within 0.2 mg accuracy. With a
spoon spatula spread approximately two g of grease in a thin film inside the
tube and weigh to within 0.2 mg; add 100 mL of the test fluid and stopper the
tube.
b. Using the mechanical shaker, shake tube until sample appears to be thoroughly
dispersed (approximately 1/2 h).
c. Centrifuge the tube until fluid and sample are completely separated, and the
fluid portion is clear and transparent.
d. Weigh evaporating dish to within 0.2 mg.
e. Pipet 50 mL of the clear fluid from the centrifuge tube into evaporating dish.
Place dish on steam bath until liquid is evaporated. Then dry dish in oven for
1/2 h at approximately 100C.
f. After drying, remove dish from oven and reweigh to within 0.2 mg. Determine
the weight of residue, and calculate the percent of sample soluble in test fluid
(see 7.1).
6.2 Determine the deterioration of the sample due to the test fluid as follows:
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