MIL-PRF-27601C
TABLE V. Quality conformance tests.
Inspection
Paragraph
Requirement
Test Method
Pour point
4.4.2
3.3
Flash point
4.4.2
3.3
Fire point
4.4.2
3.3
Neutralization number
4.4.2
3.3
Viscosity (finished fluid)
4.4.2
3.3
Specific gravity
4.4.2
3.3.1
Low temperature stability
4.4.2
3.3.13
Solid particle contamination
4.4.7
3.3.4
Foaming characteristics
4.4.2
3.3.5
Water content
4.4.2
3.3.6
High temperature-high pressure spray ignition
4.4.2
3.3.8.1
Flame propagation
4.4.6
3.3.8.2
Lubricity
4.4.2
3.3.9
Rubber swell
4.4.2
3.3.14
Inspection of filled containers
5.1
4.4.7
Thermal stability
4.4.5
3.3.12
4.2.3 Retention of qualification. In order to retain qualification of approved products for listing on the Qualified
Products List (QPL), the manufacturer shall verify, by certification to the qualifying activity, that the
manufacturer's product complies with the requirements of this specification. The time of periodic verification by
certification shall be in two-year intervals from the date of original qualification. The Government reserves the
right to re-examine the qualified product whenever deemed necessary to determine that the product continues to
meet any or all of the specification requirements.
4.3 Quality conformance inspection. Quality conformance inspection shall consist of examination of the sample
filled containers (see 4.4.7), determination of the solid particle contamination count (see 4.4.2) and testing the
sample against all requirements specified in table V. In the event of a solid particle contamination count failure,
the referee method shall be the microscopic method ASTM F312. Samples shall be labeled completely with
information identifying the purposes of the sample, name of the product, specification number, lot and batch
number (see 6.7), date of sampling, and contract number.
4.4 Methods of inspection
4.4.1 Inspection. Inspection shall be in accordance with method 9601b of FED-STD-791 and 4.4 of this
specification.
4.4.2 Tests. The hydraulic fluid properties shall be determined in accordance with the applicable methods
specified in table VII and 4.4.3 through 4.4.6. Physical and chemical values specified in section 3 apply to the
average of the determinations made on the samples.
TABLE VI. Sample for particle contamination.
Number of
Sample size
Container
determinations
(ml) 1/
per sample
8 ounces
100
1
1 quart
100
1
1 gallon
200
2
5 gallons
300
3
55 gallons
600
6
1/
Each determination shall be made on 100 ml portion of the sample. Should the particle count on any individual determination be
considered excessive, the two additional determinations on another sample from the same container may be used. The container shall be
thoroughly shaken immediately prior to withdrawing each 100 ml portion for such additional determinations. The arithmetic average of
the two closer particle counts shall be considered the particle count for the sample.
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