These paper or plastic capacitors, because of their low-power factor, high-breakdown voltage, low-dielectric absorption, and high-insulation resistance, are intended for use in filter, bypass, and blocking applications were the ac component of the impressed voltage is small with respect to the dc voltage rating. 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: low frequency vibration and wide temperature fluctuations. These capacitors also receive 250 hours of life testing. Commercial components are not designed to withstand these military environmental conditions.