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|  MIL-C-18312F
3.13 Thermal shock and immersion. When tested as specified in 4.7.10, the capacitors and brackets, as
applicable, shall meet the following requirements:
a. Dielectric withstanding voltage.
Insulating sleeves ...............................................................
Not less than 4,000 volts dc.
Terminal to terminal ............................................................
150 percent of rated dc voltage.
Terminal to case (where the case is not a terminal) ...........
As specified (see 3.1).
b. Capacitance. Capacitance value shall be within 10 percent of the initial value obtained when measured as
specified in 4.7.4.
c. Dissipation factor. Dissipation factor value shall be not more than 110 percent of the initial requirement
(see 3.8).
d. Insulation resistance.
Insulating sleeves ............................................................
Not less than 100 megohms.
Terminal to terminal .........................................................
Not less than 1/3 of value specified in 3.9.1.
Terminal to case (where the case is not a terminal) ........
Not less than 1/2 of value specified in 3.9.2.
After the test, capacitors shall show no indication of extensive corrosion or obliteration of marking.
There shall be no unwrapping of or mechanical injury to insulating sleeves (where applicable).
3.14 Solderability (axial wire leads only). When capacitors are tested as specified in 4.7.11, the dipped surface of
the capacitor leads shall be at least 95 percent covered with a new, smooth, solder coating. The remaining 5
percent of the lead surface may show only small pinholes or rough spots; these shall not be concentrated in one
area. Bare base metal and areas where the solder dip failed to cover the original coating are indications of poor
solderability, and shall be cause for failure. In case of dispute, the percent of coverage with pinholes or rough spots
shall be determined by actual measurement of these areas, as compared to the total area.
3.15 Shock, specified pulse. When capacitors are tested as specified in 4.7.12, there shall be no intermittent
contacts of 0.5 millisecond (ms) or greater duration, or momentary arcing, or other indication of breakdown, nor shall
there be any open-circuiting or short-circuiting or evidence of mechanical damage (see 6.6.1).
3.16 Moisture resistance. When tested as specified in 4.7.13, capacitors shall meet the following requirements:
a. Dielectric withstanding voltage.
Insulating sleeves ...............................................................
Not less than 4,000 volts dc.
Terminal to terminal ............................................................
150 percent of rated dc voltage.
Terminal to case (where the case is not a terminal) ...........
As specified (see 3.1).
b. Capacitance. Capacitance value shall be within 10 percent of the initial value obtained when measured
as specified in 4.7.4.
c. Dissipation factor. Dissipation factor value shall be not more than 110 percent of the initial value (see 3.8).
d. Insulation resistance.
Insulating sleeves ............................................................
Not less than 100 megohms.
Terminal to terminal .........................................................
Not less than 1/3 of value specified in 3.9.1.
Terminal to case (where the case is not a terminal) ........
Not less than 1/2 of value specified in 3.9.2.
After the test, capacitors shall show no indication of extensive corrosion or obliteration of markings. There shall be
no unwrapping of or mechanical injury to insulating sleeves (where applicable).
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