MIL-PRF-27617G
3. REQUIREMENTS
3.1 Qualification. Grease furnished under this specification shall be products that are authorized
by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.2
and 6.3).
3.2 Materials. The grease shall be a smooth, homogeneous compound that consists essentially of
a gelling agent and a suitable liquid lubricant. Type V may be formulated with a sufficient concentration of
additional additive(s), such as molybdenum disulfide as specified in SAE AMSM-7866, to enhance the
extreme pressure and antiwear properties and shall not contain graphite.
3.3 Chemical and physical requirements. Products shall conform to the requirements as specified
in Table I and 3.4 through 3.7.
3.4 Resistance to fuel
3.4.1 Solubility in fuel. When tested as specified in 4.4.1, the grease solubility in fuel shall be not
greater than 20 percent by weight for type II, type III, and type IV.
3.4.2 Resistance to fuel. When tested as specified in 4.4.1, a layer of grease on an aluminum test
panel shall not be visibly affected by immersion in fuel. The fuel shall not cause swelling, blistering, or
cracking of the grease, nor shall the adhesion of the grease to the metal be weakened.
3.5 Resistance to aqueous solutions. When tested as specified in 4.4.1, the grease shall not
disintegrate nor dissolve in distilled water or in a 50-percent solution of alcohol in distilled water.
3.6 Film stability and corrosion on steel. When tested as specified in 4.4.4, a film of the grease
shall withstand exposure to 100°C (212°F) for one week without forming a hard, resinous deposit and there
shall be no evidence of corrosion on the steel panels.
3.7 Storage stability. When stored for eight months as specified in 4.4.1, penetration requirements
shall comply with Table II. Slight separation of oil from thickener shall not be cause for rejection.
3.8 Workmanship. The grease shall be a smooth and homogenous mixture and of a uniform
consistency. It shall be free from lumps and extraneous materials and essentially free of separated fluid
when examined visually (see 4.4.3).
4. VERIFICATION
4.1 Classification of inspections. The examination and testing of the grease shall be classified as
follows:
a. Qualification inspection (see 4.2).
b. Periodic qualification re-evaluation (see 4.2.4).
c.
Conformance inspection (see 4.3).
4.2 Qualification inspection.
4.2.1 Qualification inspection. The qualification inspection performed by the qualification laboratory
shall consist of a review for approval of the submitted manufacturer's report and subjecting the qualification
sample to examination and testing to determine conformance to this specification.
4.2.2 Qualification sample. The qualification sample shall consist of a minimum of three pounds of
grease. The sample shall be properly identified and forwarded to the activity responsible for inspection as
specified in the letter of authorization from that activity (see 6.3).
4.2.3 Retention of qualification. In order to retain qualification of approval for listing on the QPL,
the manufacturer shall verify, by certification, to the Qualifying Activity that the manufacturer's product
complies with the requirements of this specification. The time of periodic verification by certification shall be
in five-year intervals from the date of original qualification. The Government reserves the right to re-
examine the qualified product whenever deemed necessary to determine the product continues to meet any
or all of the specification requirements.
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