FED-STD-791D
4.1.4 Beakers, 400-mL capacity, heat resistant glass.
4.1.5 Desiccator capable of holding several centrifuge tubes.
4.1.6 Forced circulation oven capable of being controlled at 105 " 3C
4.1.7 Forced circulation oven capable of being controlled at 20 " 1C.
4.1.8 Cylinder, graduated, 100 and 400 mL.
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 (TT-N-95, type II) [1,4,0].
NOTE 2:
Caution. Naphtha is flammable.
6. PROCEDURE
6.1 Perform three solubility tests (three centrifuge tubes) for each oil.
6.2 Clean centrifuge tubes and dry them in oven at 105 " 3C (220 " 5F) and permit
them to cool to room temperature in a desiccator.
6.3 Number each tube and weigh it to the nearest mg.
6.4 Place 320 mL of the oil into a 400-mL beaker and heat in an oven at 120 " 1C for
20 " 1 min.
6.5 Remove the beaker from the oven, allow the beaker to cool to 25 " 3C. Transfer
100 " 1 mL of the oil from the beaker to each of the tarred centrifuge tubes. Cork the tubes.
6.6 Place the centrifuge tubes in an upright position in a darkened area such as a drawer
or cupboard. The temperature should be maintained at 25 " 3C for the length of the storage
period, 30 " 1 days.
6.7 In transferring the centrifuge tubes from the storage area to the centrifuge, care must
be taken not to disturb any material which may have separated from the oil. Remove the tubes
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