MIL-PRF-46176B
of 12.7 mm above the tops of the assembled strips. Secure the lids of the jars and
place the jars in a gravity convection oven maintained at 100 ± 2°C for
120 ± 2 hours. Allow the jars to cool for 60 to 90 minutes following the test
period, then remove the metal strips and rubber cups from the jars. Wash the three
rubber cups quickly in isopropyl alcohol and air-dry them. Disassemble the metal
strips and clean them of all adhering sediment, sludge, and corroded particles by
flushing with isopropyl alcohol. Clean the strips individually by wiping them with
a cloth wetted with isopropyl alcohol.
4.3.4.1.1 Condition of cups. Visually examine the cups for evidence of sloughing,
tackiness, blisters, or any other form of disintegration after the corrosiveness test to verify
conformance to 3.4.1.1. Any evidence of these conditions shall constitute failure of this test.
4.3.4.1.2 Cup base diameter change. Determine the base diameters of the rubber cups to
the nearest 0.03 mm after the corrosiveness test to verify conformance to 3.4.1.2. An increase in
diameter of less than 0.03 mm or more than 1.40 mm from the initial base diameter measurement
for any cup shall constitute failure of this test. Diameter measurements shall be made within
15 minutes after removal of the cups from the fluid.
4.3.4.1.3 Cup hardness change. Measure the hardness of the rubber cups IAW
ASTM D1415 after the corrosiveness test to verify conformance to 3.4.1.3. A decrease in
hardness of more than 15 points from the initial hardness measurement for any cup shall constitute
failure of this test. Hardness measurements shall be made within 15 minutes after removal of the
cups from the fluid.
4.3.4.1.4 Condition of metal strips. Visually examine the metal strips for evidence of
pitting or etching after completion of the corrosiveness test to verify conformance to 3.4.1.4. Any
evidence of these conditions shall constitute failure of this test.
4.3.4.1.5 Metal strip weight change. Determine the weight change per unit area of each
strip after completion of the corrosiveness test to verify conformance to 3.4.1.5. Bring the metal
strips to constant weight in a desiccator and weigh them to the nearest 0.1 mg. These weights
shall be compared to the initial weights measured prior to the corrosiveness test. The weight
change per unit area shall be calculated by dividing the observed weight change of each strip in
milligrams by the surface area of the strip in square centimeters. Determine the average of the
three calculations made for each type of metal specimen. An average weight change per unit area
in excess of the value listed in table I for the applicable material shall constitute failure of this test.
4.3.4.1.6 Condition of brake fluid. Visually examine the brake fluid at a temperature of
25 ± 5°C for evidence of gelling after completion of the corrosiveness test to verify conformance
to 3.4.1.6. Any evidence of gelling shall constitute failure of this test.
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