MIL-DTL-17111E
layer shall be withdrawn from the bottle by means of a clean, dry pipette. This procedure shall be
repeated until a sufficient amount of oil has been recovered for determination of the aniline point.
Before the aniline point is determined, the recovered oil shall be shaken thoroughly with a 5 percent
solution of sodium carbonate.
4.5.3.2 Low-temperature turbidity. A standard turbidity sample of approximately 75 parts
per million (ppm) of barium sulfate shall be prepared by adding 25 mL of distilled water and 5 mL
of 0.5 normal sulfuric acid to 5 mL of a 0.0032 molar solution of barium chloride in a 50-mL
volumetric flask. The solution shall then be shaken well to ensure complete precipitation.
Distilled water shall then be added to give a total volume of 50 mL. The barium sulfate suspension
shall be freshly prepared prior to use. The fluid to be tested shall be stored for not less than 72
hours at a temperature not to exceed -37 °C. For visual examination, the fluid shall be stored in
round, clear, glass bottles, approximately 1 inch to 1.5 inches in diameter. Four-ounce oil sample
bottles or pour point bottles may be used. Where photometric methods are used as a means of
comparison, the fluid shall be stored directly in the container used in making the transmission
determination. Either visual or photometric methods may be used to compare the test fluid with
the standard barium sulfate turbidity sample. In either method, the comparisons shall be carried
out in containers of the same size and shape with approximately equal volumes. The standard
barium sulfate suspension shall be shaken vigorously within 5 minutes prior to making the
comparison. Each test vessel containing the fluid shall be inverted four times and observed within
2 minutes after removal from low-temperature storage. The temperature of the fluid shall not be
above -34 °C at the time the turbidity determination is made.
4.5.3.2.1 Visual comparison. The fluid after storage shall be compared directly to the
standard barium sulfate suspension against light from a tungsten filament source reflected from a
white surface. To prevent condensation of water on the cold fluid container, the bottle shall be
dipped in a 50/50 mixture of methanol and glycerol (also maintained at a temperature not above
-34 °C). The fluid shall show less turbidity than the barium sulfate suspension.
4.5.3.2.2 Photometric comparison. Transmission measurements shall be carried out on
the following:
a. Distilled water.
b. Standard barium sulfate suspension.
c. The fluid at room temperature.
d. The fluid within 2 minutes after removal from low-temperature storage and with the
fluid temperature not above -37 °C.
The percentage transmission of the standard barium sulfate suspension as compared to distilled
water shall be calculated. The percentage transmission of the fluid after storage as compared to
the fluid at room temperature shall also be calculated. The percentage transmission of the fluid
after low-temperature storage shall be greater than the percentage transmission of the standard
barium sulfate suspension.
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