MIL-C-18312G
3.4.4 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally or externally,
including nuts and washers. Tin content of capacitor components and solder shall not exceed 97 percent, by mass.
Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.10).
Lead-free, tin alloy high temperature solders may be used where high temperature solder is necessary with the
approval of the qualifying activity. The tin content of lead-free high temperature solders shall not exceed 97 percent,
by mass.
3.5 Seal.
3.5.1 Liquid or solid impregnated capacitors. When capacitors are tested as specified in 4.7.2, there shall be no
evidence of repetitive bubbling.
3.5.2 Liquid-filled capacitors. When liquid-filled capacitors are tested as specified in 4.7.2, there shall be no
evidence of liquid leakage.
3.6 Dielectric withstanding voltage. When tested as specified in 4.7.3, capacitors shall be capable of withstanding
the dc potentials specified (see 3.1) without permanent damage, or open-circuiting or short-circuiting. Momentary
breakdowns (see 6.6.2) shall be permitted.
3.7 Capacitance. When measured as specified in 4.7.4, the capacitors shall be within the tolerance of the nominal
value specified (see 3.1).
3.8 Dissipation factor. When measured as specified in 4.7.5, the dissipation factor of the capacitors shall not
exceed the value specified (see 3.1).
3.9 Insulation resistance (see 6.6.2).
3.9.1 Terminal to terminal. When measured as specified in 4.7.6, the product of the nominal capacitance,
expressed in microfarads (µF), and the insulation resistance, expressed in megohms, shall be not less than the
values specified (see 3.1), as applicable.
3.9.2 Terminal to case. When measured as specified in 4.7.6, where the case is not a terminal, the insulation
resistance between terminal and case shall be not less than the value specified (see 3.1).
3.10 Barometric pressure (reduced) (qualification only). When tested as specified in 4.7.7, capacitors shall
withstand a dc potential equal to 125 percent of rated dc voltage without visible damage, external flashover, or open-
circuiting or short-circuiting.
3.11 Vibration. When capacitors are tested as specified in 4.7.8, 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 6.6.2).
3.12 Salt atmosphere (corrosion). When capacitors are tested as specified in 4.7.9, there shall be no harmful
corrosion, and at least 90 percent of any exposed metallic surfaces of the capacitor, shall be protected by the finish.
Harmful corrosion shall be construed as being any type of corrosion which in any way interferes with mechanical or
electrical performance. There shall be no unwrapping of or mechanical damage to insulating sleeves. In addition,
corrosion of the terminal hardware or mounting surface shall not exceed 10 percent of the surface area. Marking
shall remain legible.
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