MIL-PRF-46170E
a). Select two (2), white, 0.45-micron, polypropylene membrane filters (such as Pall-
Gelman, GH-Polypro). Place each filter in a clean petri dish, cover, and put both
dishes in a desiccator for at least 15 minutes.
b). Remove petri dishes containing filters from the desiccators. Take a filter from its
petri dish, pass it through an ionizer for 10 seconds, and then weigh it. After
weighing, immediately return the filter to its petri dish. Repeat with the second filter.
c). Mark one filter as the control filter and one filter as the test filter. Stack the test filter
on top of the control filter and place on the filtration apparatus.
d). After filtering and drying on a filtration apparatus, dry the filters in their covered petri
dishes for 15 minutes in a 75C oven. Do not use other drying methods. Remove
closed petri dish from the oven; allow filters to equilibrate to ambient room
conditions in a desiccator for 15 minutes before weighing.
3.4.7 Relative Density. The relative density of the hydraulic fluid shall be determined
and reported, but not limited during qualification inspection. For conformance inspections, the
relative density of the hydraulic fluid shall be the value obtained during qualification inspection
±0.008.
3.4.8 Storage stability. Fully blended hydraulic fluid shall show neither separation of
ingredients nor evidence of crystallization after 12 months of storage at 24 ± 3°C. The blended
product shall be clear and transparent when examined visually, and shall conform to all
requirements specified herein, except particulate contamination.
3.4.9 Workmanship. The hydraulic fluid shall be a clear, transparent product,
homogeneous in appearance, and free from visible sediment and suspended matter.
3.5. Marking and labeling requirements. In addition to any special marking required in
the contract or order, the unit containers shall also be marked with the following:
"MILITARY SYMBOL FRH
NATO CODE NUMBER H-544
NOT TO BE USED FOR AIR APPLICATIONS"
Containers shall also be marked with the following:
INSTRUCTIONS:
This fluid is not interchangeable with any other type or grade of
hydraulic fluid due to the fire resistant properties. It is compatible
with MIL-PRF-5606, MIL-PRF-6083, MIL-PRF-83282, and MIL-
PRF-87257 remaining after draining, no flushing required.
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."
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