MIL-PRF-81329D
4.5.6 Endurance life test. The lubricant shall be subjected to an endurance test in
accordance with ASTM-D2625. The cure schedule shall be as follows:
a. Air dry for 30 minutes at room temperature (25 ± 3 °C),
b. Heat for two hours at 80 ± 1 °C, and
c. Heat for two hours at 150 ± 3 °C.
The test pin shall be uncoated and fabricated from a molybdenum alloy (0.5Ti 0.08Zr) having a
Rockwell hardness B95 to B99 and a surface finish of 8 to 12 root-mean-square (rms). The
V-blocks may be phosphated or grit blasted with 120 grit steel to produce a surface roughness of
50 to 60 rms.
4.5.7 Storage stability test. A full one-liter container shall be stored for 12 months at
25 ± 3 °C. At the conclusion of the storage period, the container of lubricant shall be subjected to
mechanical agitation using an apparatus similar to MIL-M-3070, Type II, size as required, for five
minutes. The lubricant shall then be applied (see 4.5.2) and tested for film adhesion, thermal
stability, and endurance life.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in
the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD
personnel, these personnel need to contact the responsible packaging activity to ascertain requisite
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activity within the Military Department or Defense Agency, or within the Military
Department's System Command. 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.
6. NOTES
(This section contains information of a general or explanatory nature which may be helpful,
but is not mandatory.)
6.1 Intended use. The lubricant covered by this specification is intended primarily for use in
liquid oxygen systems, space vehicles, bearing assemblies, and other equipment where the
environments of extreme temperature and nuclear radiation preclude the use of commercial
lubricants and organic solid film lubricant. It is intended to reduce wear and to prevent galling
and seizing of metal surfaces. Do not use the lubricant on materials that may be adversely
affected by exposure to the specific cure temperature of 150 °C. The lubricant should not be used
with oils or greases, unless field use indicates otherwise.
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