MIL-PRF-46170E
concentrations from -40C to 135C. No formation of gums, sludge, turbidity, crystallization or
insoluble material shall occur. (see 4.5.2)
3.4.2 Corrosion protection (humidity cabinet). The hydraulic fluid shall protect specially
prepared steel test panel surfaces (both sand blasted and polished) to the extent that no more than
three (3) corrosion dots, no one of which is larger than 1millimeter (mm) in diameter, occur on
any of the surfaces of the prepared panels.
3.4.3 Corrosiveness (bimetallic couple). The hydraulic fluid shall prevent corrosion,
etching, pitting, or staining on the steel disks covered with a brass clip. The fluid shall be
deemed failing if either of the following are met:
a. the test areas of more than one disk show signs of corrosion, pitting, or other attack.
b. if two disks are free of corrosion, but the third shows more than three affected spots.
3.4.4 High temperature - high pressure spray ignition. The hydraulic fluid, when sprayed
and ignited, shall self-extinguish and shall not continue to burn when the source of ignition is
removed.
3.4.5 Low temperature stability. The hydraulic fluid shall show no evidence of gelling,
crystallization, solidification or separation of ingredients. The presence of a dense cloud that
does not settle shall not be cause for failure.
3.4.6 Particulate contamination.
3.4.6.1 Particle size. The number of solid particles per 100mL of the hydraulic fluid
shall not exceed the number specified in Table II. The particle count of the hydraulic fluid shall
be measured by the use of an automatic particle counter employing the light interruption
principle. The operating directions in the manual for the respective instrument shall be used.
TABLE II. Particle size.
Particle size range, 1/ micrometers
Max. allowable number of particles
5-25
10 000
26-50
250
51-100
50
over 100
10
1/ Size is determined by the largest dimension of the particle.
3.4.6.2 Gravimetric method. Gravimetric determination shall be made in accordance
with ASTM D4898, with the following additional requirements:
Exposure of the filter to open air shall be minimized. While the filter is in the petri dish, the lid
shall remain on at all times.
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