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

4.4

Methods of inspection

4.4.1 Inspection

Inspection shall be in accordance with method 9601 of FED-STD-791 and 4.4.3 through

4.4.3.5 of this specification.

4.4.2 Fluid

The fluid shall conform to the requirements for base stock (see 3.3) and additive

materials (see 3.2.1 through 3.2.5) and finished fluids (see 3.4) shall be determined by

appropriate examination and testing in accordance with 4.4.3.

4.4.3 Physical and chemical values

Tests shall be performed in accordance with the applicable methods specified in table V

and 4.4.3.1 through 4.4.3.5. Physical and chemical values specified in section 3 apply to

the arithmetic average of the determinations made on the samples for those values

which fall within any stated repeatability or reproducibility limits of the applicable test

method.

4.4.3.1 Gravimetric

The following procedures in addition to the requirements of ASTM D 4898 shall be

followed when performing the gravimetric test:

a. Use two white, 0.45-micron, cellulose membrane filters.

b. Prior to use, rinse each filter with filtered hexane; using forceps, place in a

covered petri dish; and dry for 15 minutes in a 70�C oven. Store prewashed and dried

filters in a petri dish placed in a desiccator with desiccant until ready to use.

c. Immediately prior to use, remove filters from the desiccator and place in separate

covered petri dishes. Dry filters in covered petri dishes for 15 minutes in a 70�C oven.

Remove petri dishes from the oven and, with dish covers closed, allow filters to

equilibrate to ambient room conditions for 5 minutes before weighing.