MIL-PRF-3572B
4.3.10.1 Grade A. The stability test of grade A lubricant shall be determined on a
representative sample of the product which has been thoroughly stirred to ensure uniformity.
From sample, remove and analyze two portions specified and centrifuge as specified in 4.3.10.3.
4.3.10.2 Grades B and C. The stability test of grades B and C lubricants shall be conducted
on a blend of one part of the lubricant with 49 parts of the neutral refined mineral oil specified
in 4.3.9.1. Heat a 98 g portion of the neutral refined mineral oil to 66° +/- 5° C and blend thoroughly
with the 2 g of the lubricant. Determine the solids content of this blend using ASTM D 524. Two
samples of the blend weighing approximately 15 g each should be analyzed. The results of this
analysis gives the initial solids content of the material to be centrifuged. The blended samples shall be
centrifuged as specified in 4.3.10.3.
4.3.10.3 Centrifuge test procedure. The centrifuging shall be conducted in a machine which
allows the tubes to swing in a horizontal position at a speed of 2,000 +/- 50 r.p.m. with a
diameter of swing (tip to tip of whirling tubes) of 14 to 17 inches. The centrifuge head shall
carry tubes of 15 ml capacity with tapered bottoms. Two centrifuge tubes shall be filled with
the samples prepared as specified in 4.3.10.1 and 4.3.10.2 to a depth of 4 inches and adjusted to
21° C. The tubes are centrifuged for 11 minutes. After this treatment, decant the supernatant
liquid from the tubes into tared beakers, pouring out only that which flows quickly, the whole
operation not to require more than 30 seconds. Weigh the decanted material and analyze in
accordance with ASTM D 524. Calculate the percent solids in suspension after centrifuging
as follows:
Grade A:
Percent solids in suspension after centrifuging = percent solids after centrifuging .
percent solids before centrifuging x 100
Grades B and C:
Percent solids in suspension after centrifuging = percent solids after centrifuging
. x 100
percent solids in blend before centrifuging
4.3.11 Particle size, grades A and B. The particle size shall be determined on grade A
lubricant as received; and on grade B, by blending one part of grade B lubricant with 49
parts of the oil specified in 4.3.9.1. The samples shall be thoroughly stirred to insure uniformity.
4.3.11.1 Particle size test procedure. A drop of the sample prepared as specified in 4.3.11,
is placed on a glass microscopic slide using the utmost care to avoid contamination of the product,
slides, or cover glass, with foreign material picked up in normal surroundings. The particle size
is determined by taking a photomicrograph of the particles followed by measurement on the print,
or by direct measurement using a metallographic microscope. A magnification of exactly 1000
diameters shall be used.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the contract or order shall specify packaging
Requirements (see 6.2). When DoD personnel perform material packaging, those personnel need
to contact the responsible packaging activity to ascertain requisite packaging requirements. The
Inventory Control Point packaging activity within the Military Department of Defense Agency, or
within the Military Department's System Command, maintains packaging requirements. Packaging
data retrieval is available from the managing Military Department's or Defense Agency's automated
packaging files, CD-ROM products, or by contacting the responsible packaging activity.
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