MIL-DTL-17111E
the condenser in such a manner that it extends to the bottom of the test tube, and dry air shall be
introduced through it at a rate of 12 ± 1 gram per hour. The inside diameter of the air tube at the
submerged end shall be 1 mm to 2 mm. With the air supply momentarily discontinued, 10 grams of
distilled water shall be added through the condenser during each of the following time periods:
72 ± 4 hours, 168 ± 4 hours, and 240 ± 4 hours. At the end of 336 hours, the oxidation shall be
discontinued. The total loss of liquid (90 grams of transmission fluid and 40 grams of water) from
the test tube during the test shall not be more than 35 grams. If the total loss exceeds this value, the
test shall be disregarded and a duplicate determination shall be made. The liquid contents of the test
tube shall be emptied into one or two tared cone-shaped oil centrifuge tubes (100-mL) and spun in a
centrifuge for not less than 15 minutes at not less than 1,200 rpm. The clear fluid and water shall be
decanted and separated and the viscosities, neutralization number, and color of the fluid shall be
determined. The precipitate remaining in the centrifuge tubes shall be washed by adding 50 mL of
light naphtha (end point not over 107 °C) and spun in a centrifuge until the naphtha layer is clear.
The naphtha shall be decanted and the centrifuge tube containing the insoluble material placed in an
oven maintained at a temperature of 66 °C to 93 °C until dry. The centrifuge tube shall be weighed,
and the weight of the insoluble material calculated as a weight percent of the original fluid charged
to the test tube. The copper test specimens shall be separated and washed successively in light
naphtha, warm toluene, and warm chloroform. The copper test specimens shall be brushed with a
small short-bristled paint brush or toothbrush while washing in the last two solvents. The
specimens shall then be dried, weighed, and examined under 20 diameters magnification for
conformance to 3.2.4.3.1.
4.5.3.4.2 72-hour test. The same apparatus and thermostatically controlled bath described
in 4.5.3.4.1 shall be used. Place 90 grams of the fluid to be tested, 20 grams of distilled water, and
copper wire conforming to A-A-59551 in the test tube as described. The wire shall be number 12 to
number 16 gage, and a sufficient length shall be selected so that there is a total surface area of at
shall be coiled in two separate sections on round mandrels of approximately 1.1 inches and
0.08 inch in diameter. The coils shall not be weighed but shall be washed in accordance with the
procedure given in 4.5.3.4.1. The two coils shall be inserted in the test tube, one inside the other, so
they are completely immersed in the test mixture. The test tubes containing the fluid, water, and
copper coils shall be placed in a thermostatically controlled bath maintained at such a temperature
that the fluid-water mixture is at a temperature of not less than 93 °C as determined by a
thermometer or thermocouple in the fluid-water mixture. Air shall be introduced in the same
quantity and manner as described in 4.5.3.4.1. At the end of 72 hours, the test shall be discontinued.
The total loss of liquid (90 grams of transmission fluid and 20 grams of water) from the test tube
during the test shall not be more than 10 grams. If the total loss exceeds this value, the test shall be
disregarded and a duplicate determination shall be made. The liquid contents of the test tube shall
be emptied into a separatory funnel and the water layer separated. The mixture may first be spun in
a centrifuge in case a stable emulsion is present. The viscosities and neutralization number of the
fluid shall be determined as required by 3.2.4. The acidity of the water layer shall be determined by
the same method used for determination of the neutralization number of the fluid layer, except that
bromothymol blue shall be used as the indicator. The acidity shall be expressed as milligrams of
potassium hydroxide per gram of water.
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