MIL-B-18F
TABLE IX. Visual and mechanical examination.
Requirement
Reference paragraph
External
Design and construction
(excluding dimensions and weight)
Terminals
Jackets
Closure
Internal
Dissimilar metals
Filler or padding
Cell-block container
Intercell separations
Intercell connections
Age of cells
3.7.11.1.1 and 3.7.11.1.2
Metallic jacket
Potting
4.7.1 Potting. The contractor shall determine the minimum weight of an adequately potted battery for each
production lot, and shall not present any batteries for conformance inspection which fail to meet this minimum weight
requirement. This shall be accomplished by determining the minimum weight of a battery filled with a sufficient
quantity of potting material which shall enable the battery to withstand the vibration and mechanical-shock tests. The
minimum weight determined for a lot shall be forwarded to the designated Government inspection facility at the time
sample batteries for the lot are shipped for group C inspection (see 3.7.13).
4.7.1.1 Flow or shrinking. Potting and sealing compounds, when used, shall be placed in a container,
approximately 3 inches (76.2 mm) wide by 6 inches (152.4 mm) long by .75 inch (19.05 mm) high to within .25 inch (6.35
mm) of the top. The temperature of the compound within the container shall be raised to 130 °F ±5 °F (54.4 °C
±2.8 °C) and the container shall be held in an inverted position for 24 hours. Then the temperature of the compound
shall be lowered to 0 °F ±5 °F (-17.8 °C ±2.8 °C). Any flow, or cracking, or shrinking of the compound from the sides of
the container shall be noted. If flow is noted at the high temperature, five batteries of the type involved shall be
exposed to 130 °F ±5 °F(54.4 °C ±2.8 °C) storage for 24 hours with the terminals resting in the lowest possible position.
At the en d of this exposure period, the batteries shall be examined to determine that there is no impairment of electrical
contact (see 3.7.12.1). At the contractor's option, batteries assigned to JI testing may be used (see 3.7.3).
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