MIL-PRF-17672E
ASTM D6481
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Standard Test Method for Determination of Phosphorus, Sulfur,
Calcium, and Zinc in Lubrication Oils by Energy Dispersive X-ray
Fluorescence Spectroscopy
(Copies of these documents are available from ASTM International, 100 Barr Harbor Dr., PO Box C700, West
Conshohocken, PA 19428-2959 or online at www.astm.org.)
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. The hydraulic fluid 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
3.1.1 Requalification. Unless otherwise approved by NAVSEA, any change in product composition,
formulation, or ingredients shall require the product to be requalified (see 4.2.1). Minor changes, such as an
increase in pour point additive or a change in base fluid materials, may require only notification; however, the extent
of supporting test data required is at the discretion of NAVSEA. In addition, the qualification of previously
qualified products shall be verified every 5 years by submission of a signed statement by the fluid supplier attesting
that no changes in product composition, formulation, or ingredients have been made in the qualified product.
3.2 Material. The hydraulic fluid shall be a blend of virgin petroleum-base hydraulic fluid stocks plus additive
agents, if necessary, to meet the requirements of this specification. The use of additives to improve the
viscosity-temperature characteristics of the base stocks is not permitted. Additives, if used to meet the pour point
requirement, shall not exceed 0.5 percent by weight. Additives, if used, shall not contain chlorine or zinc materials.
Changes to the additive components in the sample granted qualification approval, is not authorized without the
approval of the qualifying activity.
3.3 Off-gassing. The hydraulic fluid shall be certified for and assigned a usage category of either "Limited" or
"Permitted" in accordance with the chapter titled "Material Control Program" of NAVSEA S9510-AB-ATM-010
3.4 2,6-Di-tert-butylphenol (DTBP) prohibition. DTBP (Chemical Abstract Service Registry Number 128-39-
2) shall not be intentionally added to any hydraulic fluid produced under this specification. (see 4.4.2)
3.5 Toxicity. When evaluated in accordance with 4.4.3, the hydraulic fluid shall have no adverse effect on the
health of personnel when used for its intended purpose and shall not cause any environmental problems during
3.6 Performance requirements.
3.6.1 Hydraulic fluid compatibility. The hydraulic fluid shall be compatible with the reference hydraulic
fluid(s) furnished by the Government when tested as specified in 4.4.4.
3.6.1.1 Compatibility testing. Unless otherwise specified, compatibility testing shall be conducted on all
grades. If the manufacturer can verify in writing to NAVSEA that each grade of hydraulic fluid being qualified
contains the same additive package, NAVSEA may grant reduced testing.
3.6.2 Homogeneity. Additive agents shall remain uniformly distributed throughout the hydraulic fluid at all
temperatures above the pour point and up to 130 °C (266 °F). When visually inspected in accordance with 4.4.5, the
hydraulic fluid shall not exhibit sedimentation or separation of insoluble materials.
3.6.3 Appearance. The hydraulic fluid shall be free of haze or cloudiness (see 4.4.6).
3.6.4 Chemical and physical requirements. The hydraulic fluid shall conform to the chemical and physical
requirements as specified in Table I.
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