MIL-C-62F
3.2 Qualification. Capacitors furnished under this specification shall be products which are qualified for listing on
the applicable qualified products list at the time set for the opening of the bids (see 4.3 and 6.2).
3.3 Material. The material shall be as specified herein. However, when a definite material is not specified, a
material shall be used which will enable the capacitors to meet the performance requirements of this specification.
Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the
finished product.
3.3.1 Aluminum foil. Foil used in the construction of the anode shall have a minimum aluminum content of 99.95
percent, determined by the difference between 100 percent and the sum of all other metallic elements present in the
amounts of 0.001 percent or more, each expressed to the third decimal. If analysis of the aluminum foil is required, it
shall be made in accordance with ASTM E1282.
3.3.2 Internal examination. There shall be no visible evidence of corrosion when capacitors are examined as
specified in 4.5.1.1.
3.4 Design and construction. Capacitors shall be of the design, construction, and physical dimensions specified
(see 3.1).
3.4.1 Case. Each capacitor shall be in a metallic case and shall be effectively sealed against the entry of
contaminants, and leakage or evaporation of the electrolyte. The element shall be secured so that there will be no
injurious movement in the case.
3.4.1.1 Case insulation (when applicable). Case insulation shall not soften or creep at the high operating
temperature. The use of cardboard sleeves for insulating purposes shall not be permitted.
3.4.2 Terminals. The terminals shall be permanently secured internally or externally, as applicable. All external
joints shall be soldered or welded. Axial wire or tab-type terminals shall be coated in such a manner as to insure their
3.4.2.1 Solder lugs and solder-lug terminals. Solder lugs and solder-lug terminals may be of any shape, provided
dimensional limits are met, and shall be coated with solder having a tin content of 40 to 70 percent. Solder lugs on
styles CE31 through CE45 may be secured by spinning.
3.4.3 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28 (see 3.1). All threaded parts
shall engage by at least three full threads.
3.4.4 Pure tin. The use of pure tin, as an undercoat for final finish, is prohibited both internally and externally. Tin
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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 6.18).
3.5 Solderability (not applicable to plug-in capacitors and styles CE70 and CE71). When tested as specified in
4.5.2, 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
indication 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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