MIL-C-25F
3.16 Low ambient temperature and capacitance change with temperature. When tested as specified in 4.6.14,
capacitors shall withstand the application of rated dc voltage (see 3.1) without breakdown or flashover. The
capacitance change over the operating temperature range shall not exceed the following limits:
Characteristic E: ± 10 percent.
Characteristic F: + 10 percent, - 30 percent.
Characteristic K: + 7.5 percent, - 10 percent.
3.17 Life. When tested as specified in 4.6.15, capacitors shall meet the following requirements:
a. Insulation resistance at +25°C:
Not less than 30 percent of the value specified in 3.6.1.
b. Capacitance:
Change not more than 10 percent from initial value obtained when measured
as specified in 4.6.4, except for characteristic K, which shall be 5 percent.
c. Dissipation factor:
Shall not exceed 1 percent when measured as specified in 4.6.5, except for
characteristic F which shall not exceed 1.5 percent.
In addition, there shall be no mechanical failure, leakage of impregnant or filling compounds, open-circuiting or short-
circuiting.
3.18 Flashpoint of impregnant or filling compound. When tested as specified in 4.6.16, the flashpoint of
impregnant or filling compound shall be no lower than +135°C for characteristics E and F; and no lower than +145°C
for characteristic K.
3.19 Marking.
3.19.1 Capacitor identification marking. Capacitors shall be marked with the type designation and the
manufacturer's name or code symbol. There shall be no space between the symbols which comprise the type
designation. If lack of space requires it, the type designation may appear on two lines. In this event, the type
designation shall be divided between the circuit symbol and the characteristic symbols, and shall appear on two lines
as shown in the following example:
CP53B1
EB105K1
On multiple-section capacitors, the case adjacent to the common terminal, if the terminal is not the case, shall be
marked with a "C". If space permits, the capacitance in microfarads and the rating dc voltage shall also be marked.
Paper labels shall not be used.
3.20 Workmanship. Capacitors shall be processed in such a manner as to be uniform in quality and shall be free
from pits, corrosion, cracks, rough edges, and other defects that will affect life, serviceability, or appearance.
3.20.1 Riveting. The riveting operation shall be performed carefully to insure that the rivet is tight and satisfactorily
headed.
4. VERIFICATION.
4.1 Test equipment and inspection facilities. Test equipment and inspection facilities shall be of sufficient
accuracy, quality, and quantity to permit performance of the required inspection. The supplier shall establish
calibration of inspection equipment to the satisfaction of the Government.
4.2 Classification of inspections. The inspections specified herein are classified as follows:
a. Qualification inspection (see 4.4).
b. Conformance inspection (see 4.5).
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