MIL-DTL-17111E
4.5.3.3 Rust prevention. Rust prevention shall be determined by procedure A of
ASTM D665 using distilled water, except that the cleaning and preparation of the test specimens
shall be as specified in 4.5.3.3.1. The steel specimen shall exhibit no evidence of rust when
examined visually.
4.5.3.3.1 Specimen cleaning and preparation. Round specimens shall be made from steel
conforming to the requirements of ASTM A108, grade 1020, and when new shall be 0.5 inch in
diameter, approximately 5.5 inches long, and rounded at one end. The steel specimens shall be
inserted in the chuck of an apparatus capable of rotating the specimen at a speed of 1,700 rpm to
1,800 rpm, so that at least 4.75 inches of the specimen, including the rounded end, can be polished
by applying emery cloth to the rotating specimen. No. 00 emery cloth shall be used to remove all
irregularities, pits, and scratches as determined by visual examination. If the specimen has been
previously used in the test, No. 1/2 emery cloth shall be used to remove completely the previous
surface before polishing with the No. 00 emery cloth. After polishing, the specimen shall be boiled
in chemically pure toluene for 5 minutes in a chemically clean container, followed by boiling for 1
minute in high grade petroleum ether. During the boiling procedures, the specimen shall be
immersed completely in the liquids at all times. After allowing the solvent to drain from the
specimen, it shall be immersed immediately in a portion of the oil to be tested. From the start of
polishing with the emery cloth, the steel specimens shall not be touched by hand, but shall be
handled by wires, glass hooks, or clean, lintless, grease-free cloth, or gloves.
4.5.3.4 Corrosion and oxidation stability. Perform the 336-hour test and the 72-hour test
4.5.3.4.1 336-hour test. A large glass tube approximately 38 mm in diameter and at least
300 mm long shall be fitted with a ground glass connection or tightly fitting shellacked cork and a
water-cooled reflux condenser, preferably of the Allihn type, 8-mm bore, 300-mm water jacket
length (approximate dimensions). Five copper test specimens conforming to ASTM B272,
90 grams of the fluid to be tested, and 10 grams of distilled water shall be placed in the test tube.
The copper test specimens shall be polished, weighed strips, approximately 25 cm in length of
16 Brown & Sharp (B&S) gage to 22 B&S gage thickness with a small hole (1/16 inch diameter) at
each end. There shall be at least 258 cm2 surface area of copper. The copper shall be polished to a
clean surface with emery cloth. The final polishing shall be carried out with a grade not coarser
than No. 00 emery cloth. The specimens shall be weighed and then washed thoroughly in warm
high grade petroleum ether or chemically pure methylethyl ketone (MEK). Following this, the
specimens shall be allowed to evaporate dry and immediately be immersed in the fluid to be tested.
From the start of polishing with the emery cloth, the specimens shall not be touched by hand, but
shall be handled by wires, glass hooks of clean, lintless, grease-free cloth, or gloves. The five
specimens shall be tied or wired together at each end using a small copper wire with a small washer
or spacer between each specimen so that they are parallel and approximately 1/8 inch apart. The
spacers may be copper washers of the desired thickness and 5 mm outside diameter maximum or
1/8-inch lengths of glass tubing of 5 mm outside diameter maximum. The test tube containing the
fluid, water, and copper shall be placed in a thermostatically controlled bath maintained at such a
temperature that the fluid-water mixture is at a temperature not less than 93 °C as determined by a
thermometer or thermocouple in the fluid-water mixture. A glass tube shall be introduced through
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