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

TABLE III. Sampling for particle size contamination.

Container size

Sample size, mL

Determinations per sample

1 pint (pt) (0.473 liters (L))

100

1 quart (qt) (0.946 L)

100

1 gallon (gal) (3.785 L)

200

5 gal (18.9 L)

300

55 gal (208.2 L)

600

4.4.3 Examination of filled containers. Filled containers shall be examined with regard to fill,

closure, sealing, and leakage. Any container having one or more defects or under the required fill shall be

rejected.

4.5 Methods of inspection and test. Qualification inspection shall consist of the tests for all of

the requirements specified in Section 3 and Table I. Tests shall be in accordance with Table I and with

4.5.1 through 4.5.2 as applicable. Unless otherwise specified (see 6.2), reagent water conforming to the

requirements for type III of ASTM D1193 and reagent-grade chemicals shall be used in all tests. Blank

determinations shall be run and corrections applied when necessary.

4.5.1 Compatibility. Samples of the candidate hydraulic fluid in amounts of 20mL, 100mL, and

180mL shall be mixed with samples from each of the fluids previously qualified under this specification.

Total volume of each mixture shall be 200mL. Mixtures shall be prepared in 250mL flasks with stoppers.

The flasks shall be thoroughly agitated and then stored in an oven at 135C for 3 hours. At the end of this

time, none of the mixtures shall show any sign of sediment, turbidity, or crystallization. The samples

shall then be stored at -54C for a period of 3 hours. Slight turbidity after this time, which later

disappears, will be permitted in the samples. Compatibility tests described herein shall also be conducted

with representative fluids qualified to MIL-PRF-5606, MIL-PRF-46170, MIL-PRF-83282, and MIL-

PRF-87527.

4.5.2 Shear stability.

4.5.2.1 Calibration of the instrument shall be conducted in accordance with ASTM

D2603 using ASTM Reference Fluid B. Repeat, as needed, to determine the proper power

settings to produce a viscosity change of 15.0% at 40C. The viscosity shall be measured in

accordance with ASTM D445.

4.5.2.2 After successful calibration of the instrument, the control fluid (ASTM

Reference Fluid B) and test fluid shall be analyzed on the same day. The fluids shall be tested at

0C for 30 minutes.

5. PACKAGING

5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the

contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD personnel,

these personnel need to contact the responsible packaging activity to ascertain requisite packaging