MIL-PRF-5606H
TABLE III. Solid particle contamination.
Particle Size Range
Allowable Number (max)
(largest dimension)
each determination
micrometers
automatic count
5-15
10,000
15-25
1,000
25-50
150
50-100
20
Over 100
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3.5
Performance
3.5.1 Corrosiveness and oxidation stability
When tested as specified in 4.4.3, the requirements presented in table II shall be met.
3.5.2 Low temperature stability
When tested as specified in 4.4.3 for 72 hours at a temperature of -54°C +1°C, the fluid
shall show no evidence of gelling, crystallization, solidification, or separation of
ingredients.
3.5.3 Shear stability
When tested as specified in 4.4.3, the percent viscosity decrease of the hydraulic fluid,
measured in centistokes at 40°C, shall be not greater than the percentage viscosity
decrease of the shear stability reference fluid. The increase in acid number shall be not
greater than 0.20 over the original acid number.
3.5.4 Storage stability
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 after 12 months of storage
as specified in 4.4.3.
3.5.5 Color
There shall be no readily discernible difference in the color of the finished fluid compared
to the standard color when tested as specified in 4.4.3.
3.5.6 Toxicity
The hydraulic fluid shall have no adverse effect on the health of personnel when used for
its intended purpose. The fluid shall contain no components that produce noxious
vapors in such concentrations as to be an irritant to personnel during formulation or use
under conditions of adequate ventilation. Exercise caution to avoid prolonged contact
with the skin and observe Occupational Safety and Health Administration (OSHA)
guidelines. Questions pertaining to the toxic effects shall be referred to the appropriate
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