MIL-PRF-83870C
TABLE III. Qualification tests
Filter element no. 1
Filter element no. 2
Filter element no. 3
Filter element no. 4
Test
(2nd lowest initial bubble
(lowest initial bubble point)
(highest initial bubble
point)
point)
Examination of
Examination of
Examination of
Examination of
4.6.1
product
product
product
product
Initial bubble point
Initial bubble point
Initial bubble point
Initial bubble point
4.6.2.1
Immersion
Immersion
Immersion
Immersion
4.4.3
Initial bubble point
Initial bubble point
Initial bubble point
Initial bubble point
4.6.2.1
Max particle passed
N/A
N/A
N/A
4.6.5
Cold start
N/A
N/A
N/A
4.6.3
Initial bubble point
N/A
N/A
N/A
4.6.2.1
N/A
Pressure buildup and
N/A
N/A
4.6.6
collapse
N/A
Initial bubble point
N/A
N/A
4.6.2.1
N/A
N/A
Efficiency
N/A
4.6.4
N/A
N/A
Initial bubble point
N/A
4.6.2.1
N/A
N/A
Flow fatigue
4.6.7
N/A
N/A
Initial bubble point
N/A
4.6.2.1
N/A
N/A
N/A
Media and abrasion
4.6.8
migration
N/A
N/A
N/A
Initial bubble point
4.6.2.1
4.3 Conformance inspection. Conformance inspection shall consist of the individual tests in 4.3.1 and the sampling tests
in 4.3.2.
4.3.1 Individual. Each filter element shall be subjected to the examination in 4.6.1, except for dimensional analysis, the
conformance bubble point test in 4.6.2.2, and, when applicable, the pressure relief valve test in 4.6.9.
4.3.2 Sampling. A sample of filter elements shall be selected in accordance with ANSI/ASQ Z1.4 at an S-1 inspection
level unless modified in the procurement document (see 6.2), and shall be subjected to the pressure build-up and
collapse test in 4.6.6, pressure drop (clean element) part only, and the pressure drop (clean element) shall not exceed
the value specified in table II.
4.4 Test conditions and preparation.
4.4.1 Test fluid. Unless otherwise specified, the test fluid used for all tests shall conform to MIL-PRF-7808
lubricating oil.
4.4.1.1 Test fluid cleanliness. Unless otherwise specified, the test fluid shall be pre-cleaned by circulation through a
5-micron absolute filter (see 6.4). Contamination in the test fluid shall be less than 0.0004g/2000 mL of test fluid.
4.4.1.2 Test fluid temperature. Unless otherwise specified, the test fluid temperature shall be 100°± 10°F.
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