MIL-PRF-6083 Hydraulic Fluid, Petroleum Base, For Preservation And OperationThis specification describes the characteristics and provides the requirements for one grade of petroleum base hydraulic fluid for use in the -54??C to +135??C temperature range \(see 6.1\). This fluid is rust inhibited and used both as a preservative for hydraulic systems and components as well as being an operational fluid. This hydraulic fluid will not be used for aircraft systems, aircraft ground support equipment, or the preservation of aircraft components. The hydraulic fluid is identified by Military Symbol OHT and NATO Symbol C-635.

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MIL-PRF-6083G

3.4.8 Shear stability. The decrease in viscosity of the hydraulic fluid, measured in centistokes at

40C, shall not be more than 2.0 percent greater than the decrease in viscosity of the ASTM Reference

Fluid B. The viscosity shall be measured in accordance with ASTM D445.

3.4.9 Storage stability. After 12 months of storage, the fully blended product shall show

no separation of ingredients or evidence of crystallization. The fully blended product shall be clear

and transparent when examined visually, and shall conform to the requirements of section 3, except

particulate contamination.

3.4.10 Workmanship. The hydraulic fluid shall be a clear, transparent product,

homogeneous in appearance, and free from visible sediment and suspended matter.

3.5 Cleaning. Prior to filling, all containers shall be thoroughly cleaned, rinsed with clean

filtered fluid and examined to insure absolute absence of loose solder, dirt, fibers, lint, metal particles,

seaming compound, corrosion products, water, or other foreign contaminants. The bottom seam shall

show no extruded seaming compound and there shall be no seaming compound on the body immediately

adjacent to the side seam. Visible seaming compound, evenly distributed and forming a very fine edge at

the point of contact of the seam with the body, shall not be considered a defect. When a soldered seam is

used in the fabrication of the can, residual soldering flux shall not be present on the inside seam of the

container.

3.6 Marking and labeling requirements. Labeling of unit and exterior containers shall be in

accordance with all government regulations and shall contain the following information:

"Military Symbol OHT NATO Code

Number C-635"

INSTRUCTIONS:

This fluid is not interchangeable with any other type or grade of hydraulic

fluid. It is compatible with MIL-PRF-5606, MIL-PRF-87257, MIL-PRF-

46170, and MIL-PRF-83282. This fluid can be mixed (compatible) with MIL-

PRF-5606, MIL-PRF-87257, MIL-PRF-46170 and MIL-PRF-83282; it

cannot be used as a substitute (interchangeable) for the above named hydraulic

fluids.

WARNING:

This fluid may contain less than trace amounts of the ortho isomer of tricresyl

phosphate, which is neurotoxic. For the safe use of this product, appropriate

protective measures (e.g. gloves, clothing, respirators) should be taken. Avoid

inhalation, ingestion, or contact with the skin. Do not reuse containers."

3.6.1 Hazard warning label. Unit and exterior containers shall be marked with a hazard

warning label prepared in accordance with the Hazard Communication Standard, 29 CFR 1910.1200.

The appropriate warning shall convey the specific physical and health hazards including target organ

effects of the material.