MIL-DTL-85054D(AS)
4.4 Test specimen preparation.
4.4.1 Test disks and panels required. Panels measuring 2 by 4 by 0.125 inch (5 by 10 by
0.32 mm) and disks measuring 2.125 inches (5.4 mm) in diameter by 0.063 inch (0.16 mm) thick
shall be prepared from carbon steel conforming to SAE AMS5046 (SAE1020). The panels and
disks shall have all sharp edges and burrs removed and shall have all holes chamfered to prevent
injury in handling. The panels and disks shall be surface ground and hand polished with a 240
grit silicon carbide, aluminum oxide cloth or paper to produce a surface finish of 10 to 20
microinches root mean square (rms). Iron oxide media or wet and dry papers and cloths shall not
be used. The number of disks and panels required for individual tests shall be as follows:
Test Paragraph
Disks
Panels
4.6.1
3
0
4.6.2
3
0
4.6.3
0
3
4.6.6.3
0
3
4.6.7
0
2
4.6.9
3
0
4.6.10
0
1
4.4.2 Cleaning of test panels and disks. The utensils and cloths used to clean test panels
and disks shall be clean and free of contamination. Solvents shall be fresh and renewed
frequently. In all stages of treatment, the handling of panels and disks with the bare hands shall
be avoided. The panels and disks shall not be permitted to contact contaminated surfaces during
the cleaning procedure and shall be handled by tongs and hooks during and after dipping. After
polishing, they shall be cleaned with a surgical gauze swab in a beaker of hot mineral spirits
conforming to MIL-PRF-680, type II. Cleaning and scrubbing shall be followed by (1) dipping
in a second container of hot mineral spirits, (2) boiling in 95 percent methanol, and (3) boiling in
absolute methanol. The panels and disks shall be allowed to dry and shall then be stored in a
desiccator until ready for use. If storage exceeds 24 hours, the surface preparation shall be
repeated starting with hand polishing.
4.4.3 Coating of the test disks. Application of the compound to the test disks shall be
performed under the atmospheric conditions specified in 4.5. The disks shall be held at an angle
of 30 degrees from the horizontal. A coating of the compound shall be sprayed on the disks from
a self-pressurized container or a container conforming to SAE-AS22805 held 12 inches (30.2
mm) away. After ten minutes a second coating shall be applied. The combined thickness of the
two coats after drying shall be not greater than 1.5 mils. After application, the disks shall be
conditioned for 24 hours under the atmospheric conditions of 4.5.
4.5 Test conditions. Physical tests contained in this specification shall be made under
controlled atmospheric conditions having a relative humidity of 50 +10 percent and a
temperature range of 68 to 78 °F (20 to 25 °C).
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