MIL-PRF-85899A(AS)
4.2.2.2 Size determination tests. Following the first successful bead dryness test (see
4.2.4.5), samples shall be drawn at random for determination of conformance to imbiber bead
size (see 3.2.1) and shall be tested as specified in 4.2.4.6. Special inspection leve1 S-2 of
ASQC-Z1.4 shall be used to determine sample frequency.
4.2.3 Examination. Each sample, selected in accordance with 4.2.2, shall be examined to
determine conformance to 3.2.3, 3.2.6, 3.2.7, and 3.3.
4.2.4 Test.
4.2.4.1 Funnel flow test. The ability of the mixture to flow by gravity alone shall be tested
by pouring not less than ten pounds of the mixture through a funnel. Funnel diameter at the
throat shall be not greater than 2.4 inches. The flow through the funnel shall be blocked until
material depth reaches no less than eight inches above the throat. After the minimum depth is
reached, the flow shall be released and the mixture shall flow through the opening until all
material directly above the throat has passed through the funnel. Mixture remaining in the funnel
in a location not directly above the throat shall be acceptable under this test.
4.2.4.2 Fuel gelling test. The fuel gelling test is used to determine conformance of the
mixture to 3.2.3 through 3.2.5. Ambient temperature shall be 72 ± 6 °F. The gelling test shall be
conducted as follows:
Conduct the test in a clear glass cylinder or jar with a diameter of 3.0 ± 0.6 inches. Tare
weight of the glass container shall be recorded before adding the mixture. Mixture depth
shall be no less than 2.5 inches. The mixture shall be settled into the bottom of the cylinder
or jar by gentle tapping of the container. The weight of the mixture shall be determined by
weighing the glass container with the mixture. Number 2 fuel oil shall be gently added in a
ratio of 10.5 parts by weight of fuel to one part fuel gelling mixture. Weight of fuel and
mixture shall be determined and recorded to an accuracy of ± 0.05 pound. The container
shall remain stationary and no mechanical mixing or stirring shall be permitted from the
time the fuel is added until 60 minutes has elapsed. Fuel shall wet the mixture to the bottom
of the container within 30 minutes. While the fuel and mixture remains at rest in the
container, fuel-saturated beads shall rise through the liquid fuel, reaching the topmost level
of fuel. Fuel absorption and gelling shall be complete in not more than 60 minutes. Save
the product of this test for gel mobility testing per 4.2.4.3.
4.2.4.3 Gel mobility test. Conduct this test at an ambient temperature of 72 ± 6 °F and
between 60 minutes and 90 minutes from the addition of the fuel in the fuel gelling test of
4.2.4.2. The gelled fuel from 4.2.4.2 shall be stirred to achieve a uniform consistency before
conducting the mobility test as follows:
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