MIL-C-5G
4.6.14 Low-temperature storage and life (see 3.17). Capacitors shall be subjected to a temperature of -55°C
+0°C, -2°C for a period of 48 hours. Capacitors shall then be subjected to the tests specified in 4.6.14.1 or
4.6.14.2.1, as applicable.
4.6.14.1 For qualification inspection. Capacitors shall be subjected to 150 percent of dc working voltage (see 3.1)
and high operating temperature (see 3.1) ±3°C for 2,000 hours. During the test, the surge current shall be limited to
50 mA. At the conclusion of the test, capacitors shall be returned to the inspection conditions specified in 4.3, and
shall be visually examined for evidence of mechanical damage and obliteration of marking; the dielectric withstanding
voltage, insulation resistance, dissipation factor, and capacitance shall then be measured as specified in 4.6.2,
4.6.14.2 For conformance inspection.
4.6.14.2.1 Performance check. Capacitors shall be tested as specified in 4.6.14 and 4.6.14.1, except that the
4.6.14.2.2 Continuation test. Capacitors that have been subjected to the 250-hour performance check (see
4.6.14.2.1) shall be tested for an additional period of 1,750 hours in accordance with 4.6.14.1 (see 3.17.2).
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
6.1 Intended use. These mica capacitors, because of their low-power factor, high-breakdown voltage, low-
dielectric absorption, and high-insulation resistance, are intended for use in high-frequency circuits where good
stability is required for temperature, frequency, and aging, such as in timing and frequency-determining circuits.
Capacitors covered by this specification are unique due to the fact that these devices must be able to operate
satisfactorily under the following demanding conditions: 20 Gs of high frequency vibration, 100 Gs of shock
(specified pulse), and wide temperature fluctuations. These capacitors also receive 2,000 hours of life testing.
Commercial components are not designed to withstand these military environmental conditions.
6.1.1 Safe operating voltages. The voltage ratings specified (see 3.1) apply over the operating temperature range
of the capacitor, and under the following conditions:
a. Barometric pressure: As specified in the associated specification sheet for altitudes up to 50,000 feet for the
larger transmitting styles and 100,000 feet for the remaining styles.
b. Relative humidity: Up to 80 percent.
6.1.2 Flammability. It should be noted that this specification contains no requirements concerning the flammability
of the materials used in the construction of the capacitors. Users should take this into consideration when a particular
application involves this requirement.
6.1.3 Dissipation factor. For dissipation factor measurement purposes Q = 1/DF (see 3.8).
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