MIL-PRF-5606 Hydraulic Fluid, Petroleum Base; Aircraft, Missile, And OrdnanceThis specification describes the characteristics and provides the requirements for a petroleum base hydraulic fluid for use in the -54 Deg. C to +135 Deg. C temperature range \(see 6.1\). This fluid is identified by military symbol OHA and NATO Code No. H-515 \(see 6.5\).

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MIL-PRF-5606H

4.3 Conformance inspection

The conformance inspection shall consist of tests to verify conformance to the following

requirements: acid number, barium content, color of finished fluid, copper corrosion,

evaporation, flash point, foaming characteristics, low temperature stability, pour point,

solid particle contamination, steel-on-steel wear, viscosity of finished fluid, and water

content (see table II). In the event of a solid particle contamination count failure, the

referee method shall be the microscopic method, ASTM F 312, using Method A with

white and/or black filters at the Government's discretion. Unless otherwise specified by

the procuring activity, sampling of the hydraulic fluid shall be in accordance with 4.3.1

and 4.3.2. Inspection shall be in accordance with FED-STD-791, Method 9601.

4.3.1 Sampling for tests

Sampling for tests shall be conducted in accordance with ASTM D 4057 or ASTM D

4177. Failure of any conformance test shall result in rejection of the lot. In addition, a

random sample of base oil shall be selected for each lot of the finished fluid and

subjected to all the applicable conformance tests for base oil.

4.3.2 Sampling for solid particle contamination

Samples of filled and sealed containers shall be taken at periodic intervals to be

representative of each day's production in accordance with this specification, ASQ Z1.4,

Inspection Level S-3. The sample size and number of determinations shall be in

accordance with table IV.

TABLE IV. Sample for solid particle contamination.

Sample size (ml) 1/

Number of determinations

Container

per sample

1 quart

100

1 gallon

200

5 gallon

300

55 gallon

600

1/ Each determination shall be made on a 100-ml portion of the sample. If the particle

count on any individual determination exceeds the limits of table III, two additional

determinations on another sample from the same container may be used. The container

shall be thoroughly shaken immediately prior to withdrawing each 100-ml portion for

such determinations. The average of the two closer particle counts shall be considered

the particle count for the sample.