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.