FED-STD-791D
5.2 Referee lubricant (in accordance with lubricant specification), 300 mL.
5.3 1,1,1-Trichloroethane (ASTM D 4126).
5.4 Cleaning solution, glass (concentrated sulfuric acid [2,0,2] saturated with potassium
or sodium dichromate [1,0,1], technical grade).
6. PROCEDURE
6.1 Clean all flasks and centrifuge tubes as follows:
a. Thoroughly rinse with 1,1,1-trichloroethane in hood, and allow to air dry in hood.
NOTE 1: Caution. 1,1,1-Trichloroethane is toxic. Do not breathe its fumes nor allow it
to come in contact with the skin.
b. Immerse in glass cleaning solution for at least 2 h.
c. Rinse first with tap water, then with distilled water, and dry in an oven 105C (220F).
6.2 Prepare three 200-mL mixtures, in 250-mL Erlenmeyer flasks, using the following
proportions:
a.
Sample, 180 mL; referee lubricant, 20 mL.
Sample, 100 mL; referee lubricant, 100 mL.
b.
c.
Sample, 20 mL; referee lubricant, 180 mL.
6.3 Stopper with a cork stopper, and identify each flask.
6.4 Manually shake each flask vigorously for 1 min.
6.5 Loosen the stoppers, and heat the flasks in an oven for 168 h at 105 3C (221
5F).
6.6 After the 168-hour period, remove the flasks, and allow them to cool to room
temperature.
6.7 Manually shake each flask (one at a time) vigorously 1 min, and immediately fill two
clean centrifuge tubes to the 100 mL mark with its contents. Identify the contents of each tube.
Do not fill more pairs of tubes than can be spun by the centrifuge at one time.
NOTE 2:
Allow the remaining filled flasks to stand until the first set of tubes have been
completely centrifuged.
6.8 Process the centrifuge tubes as follows:
a. Heat the tubes for 5 min in a hot-water bath at 93 3C (200 5F).
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