MIL-C-25F
3.4.3.2 Solder lugs and solder-lug terminals. Solder lugs and solder lug-terminals may be of any shape, providing
dimensional limits are met, and shall be coated with solder having a tin content of 40 to 70 percent (see 6.16).
3.4.4 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. 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 6.7).
3.5 Dielectric withstanding voltage. When tested as specified in 4.6.2, capacitors shall withstand the direct current
(dc) potential specified without permanent damage or open-circuiting or short-circuiting.
3.6 Insulation resistance.
3.6.1 Terminal to terminal. When capacitors are tested as specified in 4.6.3, the insulation resistance shall not be
less than the applicable values specified in table V (see figure 1).
3.6.2 Terminals to case. When capacitors are tested as specified in 4.6.3, the insulation resistance, measured
between any terminal and the case, when the case is not a terminal, shall exceed 3,000 megohms.
TABLE V. Terminal-to-terminal insulation resistance measurements.
Capacitance rating
Minimum insulation resistance
At +25°C ± 3°C 1/
Characteristic E
0.33 microfarads, and less
6,000 megohms
Greater than 0.33 microfarads
2,000 megohm-microfarads 2/
At +85°C ± 3°C
0.033 microfarads and less
600 megohms
Greater than 0.033 microfarads
20 megohm-microfarads 2/
At +25°C ± 3°C 1/
Characteristic F
0.33 microfarads and less
4,500 megohms
Greater than 0.33 microfarads
1,500 megohm-microfarads 2/
At +85°C
0.033 microfarads and less
450 megohms
Greater than 0.033 microfarads
15 megohm-microfarads 2/
At +25°C ± 3°C 1/
Characteristic K
0.33 microfarads and less
18,000 megohms
Greater than 0.33 microfarads
6,000 megohm-microfarads 2/
At +125°C ± 3°C
0.067 microfarads, and less
150 megohms
Greater than 0.067 microfarads
10 megohm-microfarads 2/
1/ For corrections, if measurements are made at other temperatures
between +20°C and +35°C, see table VI.
2/ Product obtained by multiplying the capacitance in microfarads by
the insulating resistance in megohms.
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