MIL-C-62F
4.5.18 Shelf life (see 3.21). The build factor of the capacitors shall be determined and calculated as specified in
4.5.18.1. The capacitors shall then be stored for 100 8 hours, in a forced-air oven at a temperature of 85 3C
without any application of voltage. After the storage period, the capacitors shall be removed from the chamber and
returned to and stabilized at room ambient conditions. The shelf factor shall then be determined as specified in
4.5.18.1. DC leakage, capacitance, and dissipation factor shall then be measured, in that order, as specified in 4.5.3,
4.5.4, and 4.5.5, respectively, except that the electrification time for dc leakage measurements before and after this
test shall be 10 minutes. Capacitors shall then be examined for leakage of the electrolyte and deformation of the
case. Two capacitors shall then be subjected to the internal examination specified in 4.5.1.1 (see 3.3.2).
4.5.18.1 Build and shelf factors. Capacitors shall be charged to the dc rated voltage (see 3.1), from a constant
current source. The time to charge shall be recorded to the nearest 0.1 second. The charging current shall be such
that the charge time will not be less than 5.0 seconds and not greater than 50.0 seconds. The build factor shall be
computed as follows:
3
= A = AI x 10
Build factor =
Actual charge time
Theoretical charge time
T CV
Where:
A = actual charge time.
CV = g = IT
T = theoretical charge time.
I = charge current in milliamps.
T = CV
C = measured capacitance in microfarads.
I
V = dc rated voltage (see 3.1).
The shelf factor shall be computed as follows:
Shelf factor = Actual charge time after storage
Actual charge time before storage
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When actual packaging of materiel is to be performed by DoD personnel, these personnel need to
contact the responsible packaging activity to ascertain requisite packaging requirements. Packaging requirements
are maintained by the Inventory Control Point's packaging activity within the Military Department or Defense Agency,
or within the Military Department's System Command. 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
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. Aluminum oxide electrolytic capacitors are intended for use in filter and bypass applications
where large capacitance values are required in small cases and where excess of capacitance over the nominal value
can be tolerated. For polarized capacitors, the applied ac peak voltage should never exceed the applied dc voltage;
the sum of the applied ac peak and dc voltages should never exceed the dc rated voltage (see 3.1). They are military
unique due to the fact that they must be able to operate satisfactorily in military systems under the following
demanding conditions: +85C or +125C operating temperature range, 100Gs of shock, 48 hours of salt spray
corrosion, and 2000 hours of rated voltage testing. Commercial components are not designed to withstand these
military environmental conditions.
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