MIL-PRF-85899A(AS)
3.2.4 Formulation. The mixture shall consist of 65 to 70 percent imbiber beads and the
balance wicking material, by weight. The two components shall be blended until a uniform
mixture is produced (see 4.2.4.2).
3.2.5 Fuel gelling ability. The mixture shall absorb No. 2 fuel oil within one hour to
produce a gelled fuel capable of adhering to a vertical surface (see 4.2.4.3). No stirring or
shaking shall be necessary to gel the fuel (see 4.2.4.2).
3.2.6 Funnel flow. The mixture shall flow by gravity through a funnel with a throat
diameter of not greater than 2.4 inches (see 4.2.4.1).
3.2.7 Flow. The mixture shall flow freely with no lumps or clumps measuring greater than
0.1 inch in the longest dimension (see 4.2.3 and 4.2.4.1).
3.3 Workmanship. The mixture shall be a uniform, dry, white granular substance with no
dirt or off-color inclusions and only occasional off-size particles.
4. VERIFICATION
4.1 Classification of inspection. The conformance inspection requirements are specified in
4.2.
4.2 Conformance inspection.
4.2.1 Inspection lots and sublots. A lot shall be designated for each batch of imbiber beads
produced by one manufacturer, at one plant from the same materials, and under essentially the
same manufacturing conditions. A sublot shall be designated for each batch of mixture of
imbiber beads and wicking material blended together. Each 43 pound unit of mixture shall be
identified with a lot number and a sublot letter. The lot number shall be determined by batch of
imbiber beads produced. The sublot letter shall be determined by batch of blended mixture,
measured by the capacity of the blending machine.
4.2.2 Sampling. Sampling shall be conducted in accordance with ASQC-Z1.4. Sample
frequency shall be determined by the number of units of mixture in the lot.
4.2.2.1. Fuel gelling and gel mobility tests. Samples of sublots shall be inspected for
conformance to 4.2.4.2 and 4.2.4.3. One sample shall be taken at random from each sublot. Any
sample failing to conform to the respective criteria shall be classified as defective. Defective
sublots may be returned to the blending machine for more blending and retesting. The proportion
of imbiber beads to wicking material shall not be adjusted beyond the limits specified in 3.2.4.
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