MIL-PRF-14409J
3.19 Moisture resistance. When capacitors are tested as specified in 4.5.16, the following requirements shall be
met:
a. Insulation resistance at room ambient temperature: Shall not be less than 100,000 megohms.
b. Dielectric withstanding voltage: As specified in 3.9.
c. Driving torque at room ambient temperature: As specified in 3.11.1.
d. Corrosion of exposed metallic surfaces shall not exceed 10 percent. Discoloration and tarnishing alone
shall not be cause for rejection.
3.20 Terminal strength. When capacitors are tested as specified in 4.5.17, there shall be no loosening or
rupturing of the terminals or other damage to the terminals or capacitor body. A slight separation (not exceeding .063
inch (1.60 mm)) of wire leads from the cylindrical body at the point the lead leaves the cylinder is acceptable.
3.21 Resistance to soldering heat (printed circuit mount types only, see 3.1). When capacitors are tested as
specified in 4.5.18, they shall meet the following requirements after resistance to soldering heat:
a. Capacitance: Shall be as specified in 3.6.
b. Dielectric withstanding voltage: Shall be as specified in 3.9.
c. Quality factor: Shall be as specified in 3.10.
d. Visual examination: There shall be no evidence of mechanical damage.
3.22 Seal (sealed units only) (see 3.1). When capacitors are tested as specified in 4.5.19, there shall be no
evidence of dye penetration and they shall meet the following requirements:
a. Capacitance (maximum): Shall change not more than .5 pF or 5 percent, whichever is greater.
b. Insulation resistance at room ambient temperature: Shall be not less than 100,000 megohms.
c. Dielectric withstanding voltage: As specified in 3.9.
3.23 Rotational life. When capacitors are tested as specified in 4.5.20, the following requirements shall be met:
a. Dielectric withstanding voltage: As specified in 3.9.
b. Contact resistance: Shall not exceed 0.01 ohm after test.
c. Capacitance change versus rotation: Unless otherwise specified (see 3.1), capacitance change versus
rotation of the rotor shall not deviate from a straight line by more than 10 percent and shall show no
reversals in direction.
d. Driving torque at room ambient temperature: As specified in 3.11.1.
3.24 Solderability (all solderable terminals). When capacitors are tested as specified in 4.5.21, the dipped
surface of the leads shall be at least 95 percent covered with a new, smooth, solder coating. The remaining 5
percent of the lead surface shall show only small pinholes or rough spots; these shall not be concentrated in one
area. Bare base metal and areas where the solder dip failed to cover the original coating are indications of poor
solderability, and shall be cause for failure. In case of dispute, the percent of coverage with pinholes or rough spots
shall be determined by actual measurement of these areas, as compared to the total area.
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