MIL-PRF-19978K
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
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. Capacitors covered by this specification are intended for use in electronic equipment.
Capacitors covered by this specification are unique due to the fact that these devices must be able to operate
satisfactorily in military systems under the following demanding conditions: 15 G's of high and low frequency
vibration, 100 G's of shock (specified pulse), operate in extreme temperatures (-65C to +170C), and operate in
moist environments. These capacitors also offer high reliability that is verified under a qualification system.
Commercial components are not designed to withstand these military environmental conditions.
6.1.1 Polystyrene dielectric capacitors (characteristic P). Capacitors of polystyrene dielectric, because of their low
dielectric absorption and radiofrequency losses, are intended primarily for use in calculators, computers, integrators,
time-base oscillators, laboratory standards, and other pulse applications. The outstanding characteristics of these
capacitors are low temperature coefficient and stability.
6.1.2 Polyethylene terephthalate dielectric capacitors (characteristic M). Capacitors of polyethylene terephthalate
dielectric are intended for use in high temperature applications similar to those served by hermetically sealed paper
capacitors, but where higher insulation resistance at the upper temperature limits is required.
6.1.3 Paper and polyethylene terephthalate dielectric capacitors (characteristics E, F, G, and K). Capacitors of
paper and polyethylene terephthalate dielectric are intended for applications where small case sizes and high
temperature operation are required.
6.1.4 Polytetrafluoroethylene dielectric capacitors (characteristic T). Capacitors of polytetrafluoroethylene
dielectric are intended for high temperature applications where high insulation resistance, small capacitance change,
and low dielectric absorption are required. These capacitors exhibit excellent insulation resistance values at high
temperatures.
6.1.5 Polycarbonate dielectric capacitors (characteristic Q). Capacitors of polycarbonate dielectric are especially
suitable for use in tuned circuits and precision timing due to their capacitance stability and minimum capacitance
change with temperature. Characteristic Q capacitors are no longer available in this specification due to a lack of
source (see 6.1.6).
6.1.6 Polyphenylene sulfide foil dielectric capacitors (characteristic V). Capacitors of polyphenylene sulfide foil
dielectric are intended as alternatives for polycarbonate dielectric capacitors (characteristic Q) (see 6.1.5).
6.2 Acquisition data. Acquisition documents must specify the following:
a. Title, number, and date of this specification.
b. Title, number, and date of the applicable specification sheet and the complete PIN (see 1.2.1 and 3.1).
c. Whether removable mounting retainers are to be supplied with capacitors (see 3.1).
d. If remarking of parts is required to indicate FRL (see 3.30.5).
e. Packaging requirements (see 5.1).
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