MIL-PRF-6083G
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a
conflict between the text of this document and the references cited herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a
specific exemption has been obtained.
3. REQUIREMENTS
3.1 Qualification. Hydraulic fluids 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).
3.1.1 Qualification period. All hydraulic fluid which satisfy the requirements of this
specification shall be qualified for a period not exceeding five (5) years from the date of its original
qualification. Any change in the formulation of a qualified product will necessitate its requalification.
3.1.2 Tolerances. The hydraulic fluid supplied under contract shall have the same formulation
as when qualified. The finished oil properties shall fall within permissible tolerances assigned by the
qualifying activity to the product receiving qualification.
3.2 Materials. The hydraulic fluid shall be derived from petroleum fractions. These may be
virgin or re-refined (recycled or reclaimed) stocks or a combination thereof. Re-refined stocks shall be as
defined in ASTM D4175. The base stock shall contain functional additives (anti-wear, oxidation
inhibitors, corrosion inhibitors, etc.) as are necessary to meet the specified requirements. The material
shall have no adverse effect on the health of personnel when used for its intended purpose.
3.3 Additive materials. There shall be no restriction on the types of materials used as additives
in the fluid except for those listed and those imposed by technical requirements of this specification.
Pour point depressants shall NOT be used.
3.3.1 Viscosity/temperature coefficient improvers. If necessary, only acrylic polymeric
materials may be added to the base oil in quantities not to exceed 20 percent by weight of active
ingredient in order to adjust the viscosity of the finished fluid to the values specified in 3.4 and Table
I.
3.3.2 Oxidation inhibitors. Oxidation inhibitors shall be added to the base oil in quantities not to
exceed two (2) percent by weight.
3.3.3 Corrosion inhibitors. Corrosion inhibiting materials shall be added to the blend in
quantities necessary to comply with the requirements of this specification.
3.3.4 Anti-wear agent. A maximum of 0.5 ± 0.1 percent of anti-wear agents, such as
tricresyl phosphate (TCP) conforming to TT-T-656, shall be blended in sufficient quantity to permit
the finished oil to meet the lubricity requirements specified in 3.4 and Table I. When TCP is used, the
finished fluid shall not contain more than 0.03 weight percent of the ortho-isomer.
3.3.5 Red Dye. The fluid shall contain red dye in a concentration not greater than 1 part of
dye per 10,000 parts of oil by weight.
3.4 Hydraulic fluid properties. The properties of the hydraulic fluid shall be as specified in
Table I, Table II, and 3.4.1 through 3.4.10.
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