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MIL-C-18312F
4.7.10.2 Immersion. Following thermal shock, capacitors shall be tested in accordance with method 104 of MIL-
STD-202. The following details and exceptions shall apply:
a. Test condition letter: C, except both hot and cold baths shall be a saturated solution of sodium chloride
and water.
b. Measurements after final cycle: The capacitors shall be examined for evidence of extensive corrosion,
obliteration of markings, and unwrapping or mechanical injury to insulating sleeves. Insulation resistance
(see 4.7.6) and dielectric withstanding voltage (see 4.7.3) shall be measured between two wire windings
1/2 inch apart; each winding shall consist of three close turns of 0.040 inch (18 AWG) bare copper wire,
placed around the sleeve of capacitors having insulating sleeves. In addition, all capacitors shall be
subjected to the capacitance (see 4.7.4), dissipation factor (see 4.7.5), insulation resistance at 25C 3C
(see 4.7.6), and dielectric withstanding voltage tests (see 4.7.3). The insulating sleeves of capacitors
having insulating sleeves shall be removed for these tests.
c. For conformance inspection only, two immersion cycles and 30-minute exposures shall be required.
4.7.11 Solderability (axial wire leads only) (see 3.14). Capacitors shall be tested in accordance with method 208
of MIL-STD-202. The following details shall apply:
a. Number of terminations of each capacitor to be tested: 2.
b. Special preparation of the terminations: Prior to the application of the flux and solder dip, 50 percent of the
capacitor leads shall be subjected to aging by immersion in a noncorrosive container of boiling, distilled
water for a period of 1 hour. No aging shall be required for the remaining 50 percent of the capacitor
leads.
c. Depth of immersion in flux and solder: Both leads shall be immersed to within 1/8 inch of the capacitor
body.
4.7.12 Shock, specified pulse (see 3.15). Capacitors shall be tested in accordance with method 213 of MIL-STD-
202. The following details and exceptions shall apply:
a. Mounting: Rigidly mounted by the body.
b. Test condition letter: I.
c. Electrical loading during shock: During the test, a potential of 125 percent of rated dc voltage shall be
applied between the terminals of the capacitor.
d. Measurements during and after shock: During the test, a cathode-ray oscilloscope or other comparable
means shall be used as an indicating device in determining any electrical failures. After the test,
capacitors shall be visually examined for evidence of breakdown, arcing, fractures, and other visible
mechanical damage.
4.7.13 Moisture resistance (see 3.16). Capacitors shall be exposed to five cycles of the temperature cycle
specified in 4.7.10 to condition the capacitors for the moisture resistance test. The moisture resistance test shall be
performed in accordance with method 106 of MIL-STD-202 with the following details and exceptions:
a. Mounting: Capacitors shall be mounted by their normal mounting means. Capacitors that are normally
supported by their wire leads (for example, CH09A1NE224K) shall be mounted to rigidly supported
terminals so spaced that the length of each lead from the capacitor body shall be approximately 5/8 inch.
Tubular capacitors of 0.670-inch nominal diameter and 1.250 inches in length, or greater, shall have a
supplementary mounting means, and the leads shall be supported at the ends during vibration (see 6.5).
b. Subcycle: A total of five subcycles shall be performed. The vibration required in step 7 shall be in any
direction.
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