MIL-PRF-81F
3.4.1 Pure tin. The use of pure tin as an underplate or final finish is prohibited both internally and externally. Tin
content of capacitor components and solder shall not exceed 97 percent by mass. Tin shall be alloyed with a
minimum of 3 percent lead, by mass (see 6.7).
3.5 Dielectric withstanding voltage. When measured as specified in 4.6.2, capacitors shall withstand the direct
current (dc) potential without damage, breakdown, or flashover.
3.6 Barometric pressure (reduced, qualification only). When measured as specified in 4.6.3, capacitors shall
withstand the dc potential without breakdown or flashover.
3.7 Insulation resistance. When measured as specified in 4.6.4, the insulation resistance of the capacitors shall
be not less than 10,000 megohms.
3.8 Capacitance. When measured as specified in 4.6.5, the minimum capacitance shall be no greater than the
minimum value specified and the maximum capacitance shall be not less than the maximum value specified, and no
greater than 50 percent above the maximum value specified (see 3.1).
3.9 Dissipation factor. When measured as specified in 4.6.6, the dissipation factor of capacitors shall be not more
than 0.2 percent.
3.10 Temperature coefficient and capacitance drift.
3.10.1 Temperature coefficient. When measured as specified in 4.6.7.1, capacitance change measurements
shall be within the limits specified in table I for the applicable characteristic.
3.10.2 Capacitance drift (for qualification only). When calculated as specified in 4.6.7.2, capacitance drift shall be
within 0.5 pF of the initial step 1 measurement.
3.11 Terminal strength. When measured as specified in 4.6.8, there shall be no fracture, loosening of parts, or
other mechanical failures.
3.12 Torque. When measured as specified in 4.6.9, the torque values shall be within the limits specified for
individual capacitor styles (see 3.1).
3.13 Fatigue. When measured as specified in 4.6.10, capacitors shall meet the following requirements:
Capacitance: Change not more than 12 percent or 0.75 pF, whichever is greater, from the initial value obtained
when measured as specified in 4.6.10.
Torque: As specified for individual capacitor styles (see 3.1).
3.14 Life. When tested as specified in 4.6.11, capacitors shall meet the following requirements:
Insulation resistance: As specified in 3.7.
Capacitance: Unless otherwise specified, change not more than 5 percent or 0.5 pF, whichever is greater, from
the initial value obtained when set and measured as specified in 4.6.11.1.
3.15 Shock, specified pulse. When capacitors are tested as specified in 4.6.12, there shall be no intermittent
contacts of 0.5 millisecond (ms) or greater duration or arcing or other indication of breakdown, nor shall there be any
open or short circuiting or evidence of mechanical damage.
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