MIL-PRF-5606H
2.3 Order of precedence
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 regulation unless a specific exemption has been
obtained.
3.
REQUIREMENTS
3.1 Qualification
The hydraulic fluid furnished under this specification shall be products which are
authorized by the qualifying activity for listing on the applicable Qualified Products List
in the formulation of an approved product unless specific, written approval of the
qualifying activity is obtained.
3.2 Materials
The fluid shall consist of petroleum products with additive materials to improve the low-
temperature flow and viscosity-temperature characteristics, resistance to oxidation, and
anti-wear properties of the finished product. A red dye shall be used for coloring.
3.2.1 Additives
There shall be no restriction on the types of materials used as additives in the fluid
except for those specified in sections 3 and 4 and those imposed by technical
requirements of this specification. Pour point depressants may be used.
3.2.2 Viscosity/temperature coefficient improvers
Polymeric materials may be added to the base petroleum oil in quantities not greater
than 20 percent by weight of active ingredient in order to adjust the viscosity of the
finished fluid to the values specified in 3.4.
3.2.3 Oxidation inhibitors
Oxidation inhibitors shall be added to the base oil in quantities not greater than 2 percent
by weight.
3.2.4 Anti-wear agent
The hydraulic fluid shall contain not greater than 3 percent of weight of an anti-wear
agent, such as tricresyl phosphate, that conforms to TT-T-656, or equivalent. When
tricresyl phosphate is used, it shall contain not greater than 1 percent of the ortho-
isomer.
3.2.5 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.
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