MIL-DTL-5578D
evidence of failure is indicated, the cell shall be dissected by removal of the failed area and
inspected for cause of failure. The cell shall be dispositioned as directed by the procuring
activity. In the event of failure of this test, the procuring activity and the contractor shall be
notified. MIL-STD-801 shall apply.
4.5.3 Dissection. The sectioned portion of each cell selected in 4.3.2.3 shall be examined for
conditions specified in MIL-STD-801. In the event of failure, the procuring activity and
contractor shall be notified immediately.
4.5.4 Inner-layer ply. Samples of the inner-layer ply of constructions intended for protection
levels (A) and (B) and of the self-sealing portions of constructions intended for protection levels
(C) and (D) shall be subjected to the following tests:
4.5.4.1 Fuel contamination.
4.5.4.1.1 Non-volatile gum residue. A 5-gram sample of the inner layers, up to the barrier,
shall be cut up into approximately 0.062 inch squares and placed in a flask containing 250
milliliter (ml) of test fluid conforming to ASTM-D471 Ref Fuel B, and allowed to stand for 48
hours at 77 +5 °F (25 +3 °C). The contaminated test fluid shall be decanted off and the non-
volatile gum residue determined by FED-STD-791, Method 3302, and ASTM-D381 except that
the total evaporation time shall be 45 minutes. The non-volatile material shall be not greater
than 60 milligrams (mg) per 100 ml of the contaminated fluid.
4.5.4.1.2 Stoved gum residue. The beakers containing the non-volatile material shall be
placed in an appropriate bath maintained constantly at a temperature of 572 +9 °F (300 +5 °C)
for 30 minutes. After cooling in a closed container, the beakers shall be weighed. The stoved
gum residue shall be not greater than 20 mg per 100 ml of the contaminated fluid, after necessary
corrections have been made for preformed gums originally present in the test fluid.
4.5.4.2 Inner liner strength.
4.5.4.2.1 Gum inner liner strength. The tensile strength of the gum inner layer ply, without
barrier, shall be determined in accordance with ASTM-D412, before and after immersion in
ASTM-D471 Ref Fuel B test fluid for 72 hours at a temperature of 135 +3 °F (57 +2 °C). The
tensile strength shall also be determined before and after immersion in a solution of 25 percent
MIL-DTL-85470 inhibitor and 75 percent water, by volume, for 72 hours at a temperature of
135 +2 °F (57 +2 °C). The tensile strength reduction shall be reported to the procuring activity.
The strength shall be reduced no greater than 50 percent for fuel immersion and 20 percent for
water immersion calculated on the basis of the original cross-sectional area.
4.5.4.2.2 Fabric inner liner strength. The tensile strength of the fabric inner layer ply,
without barrier, shall be determined in accordance with FED-STD-191, Method 5100 before and
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