This specification covers nine thicknesses of annealed aluminum foil for use in manufacture of capacitors and includes UNS alloy designations A91145 and A91235. Foil to be used as anodes in electrolytic capacitors is beyond the scope of this specification. Requirements for quality assurance, chemical analysis, and tensile breaking load test are detailed. The foil shall conform to the chemical composition requirements prescribed for aluminum, silicon and iron, copper, manganese, magnesium, zinc, vanadium, and titanium, and shall meet the specified requirements for tensile breaking load, direct current electrical resistance, and area per unit weight. The foil shall be supplied with the finish bright on one side and matte on the other, in the dry or slick condition (dry annealed A, dry annealed B, dry annealed C, or slick annealed) and shall be tested for surface condition by water or water-alcohol test. Spooling requirements such as roll dimensions, roll winding, and roll covering are given. Foil splices shall be either welded or knurled and shall be free of splits, slivers, wrinkles, ragged edges, or excessive pinholes.

1.1 This specification covers nine thicknesses (0.00017 to 0.00050 in. (0.0043 to 0.0127 mm)) of annealed aluminum foil used in the manufacture of capacitors.

1.2 Foil to be used as anodes in electrolytic capacitors is beyond the scope of this specification.

1.3 Alloy designations are in accordance with ANSI H35.11/H35.1(M). The equivalent Unified Numbering System alloy designations are those of Table 1 preceded by A9, for example, A91145 for Aluminum 1145 in accordance with Practice E527.

1.4 For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see Annex A1.

1.5 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.