MIL-PRF-46170E
4.4.3 Sampling for particle size test. Samples of hydraulic fluid for particle size test
shall be taken in containers (see 6.2) as specified in table III.
TABLE III. Sample for particle size.
Container size
Sample size,
Number of determinations
mL
per sample 1/
1 quart
100
1
1 gallon
200
2
5 gallon
300
3
55 gallon
600
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1/ Each determination shall be made on 100-mL portions of the sample.
4.4.3.1 Sample for determination of solid particle contamination (gravimetric method).
One sample shall be taken from the orifice of the filler during the first day that a packaging of a
batch commences, for testing IAW 3.4.6.2.
4.5 Methods of inspection and test. Qualification inspection shall consist of the tests for
all of the requirements specified in Section 3 and Table 1 and Table II. Tests shall be in
accordance with Table I and with 4.5.1 through 4.5.3 as applicable. Unless otherwise specified
(see 6.2), reagent water conforming to the requirements for type III of ASTM D1193 and
reagent-grade chemicals shall be used in all tests. Blank determinations shall be run and
corrections applied when necessary.
4.5.1 Water sensitivity. The hydraulic fluid shall be tested IAW 4.5.1.1 and 4.5.1.2. The
light transmittance of the water-treated hydraulic fluid shall be a minimum of 90%.
4.5.1.1 Preparation of test samples. Clean two 475-mL glass bottles with caps by
washing with a detergent (Alconox or equivalent), rinsing with tap water, then water IAW Type
III of ASTM D 1193, then anhydrous isopropyl alcohol and finally filtered petroleum ether.
After the petroleum ether rinse, allow the bottles to drain upside down in the dust-free clean
room where they are to be used. Clean a 250-mL volumetric flask, a funnel, a punch, and the top
of the can using the same method used to clean the 475-mL bottles above. In the clean room,
shake the can to be tested (clean and hermetically sealed) to distribute uniformly any settled
material. Punch the top of the can and transfer a 250-mL sample of oil into each of the cleaned
bottles using the volumetric flask and the funnel mentioned above. To one of the samples add
0.50-mL of water conforming to type II of ASTM D 1193, using a clean, 1.0-mL graduated
pipette. Place the cap on the bottle and shake it thoroughly for 60 seconds. Allow this mixture
to stand for 24 hours at a temperature of 24 ± 3°C.
4.5.1.2 Light transmittance test procedure. At the end of the 24-hour period, place the
untreated hydraulic fluid sample in a single beam spectrophotometer capable of being adjusted to
100% light transmittance at approximately 540 nanometers (nm), using a cell with a path length
of 1 centimeter (cm). Adjust the light transmittance at 540 nm to 100%. Remove the untreated
sample and replace it with the water-treated sample, again using a cell with a 1-cm path length.
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