ASTM B373-00(2006)
(Specification)Standard Specification for Aluminum Foil for Capacitors (Withdrawn 2015)
Standard Specification for Aluminum Foil for Capacitors (Withdrawn 2015)
ABSTRACT
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.
SCOPE
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 H35.1. The equivalent Unified Numbering System alloy designations are those of preceded by A9, for example, A91145 for Aluminum 1145 in accordance with Practice E 527.
1.4 For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see .
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.
WITHDRAWN RATIONALE
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.
Formerly under the jurisdiction of Committee B07 on Light Metals and Alloys, this specification was withdrawn in January 2015 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:B373 −00(Reapproved 2006)
Standard Specification for
Aluminum Foil for Capacitors
This standard is issued under the fixed designation B373; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope Point-to-Plane Technique (Withdrawn 2002)
E252 Test Method for Thickness of Foil, Thin Sheet, and
1.1 This specification covers nine thicknesses (0.00017 to
Film by Mass Measurement
0.00050 in. (0.0043 to 0.0127 mm)) of annealed aluminum foil
E345 Test Methods of Tension Testing of Metallic Foil
used in the manufacture of capacitors.
E527 Practice for Numbering Metals and Alloys in the
1.2 Foil to be used as anodes in electrolytic capacitors is
Unified Numbering System (UNS)
beyond the scope of this specification.
E607 Test Method for Atomic Emission Spectrometric
Analysis Aluminum Alloys by the Point to Plane Tech-
1.3 Alloy designations are in accordance withANSI H35.1.
The equivalent Unified Numbering System alloy designations nique Nitrogen Atmosphere (Withdrawn 2011)
E716 Practices for Sampling and Sample Preparation of
are those of Table 1 preceded byA9, for example,A91145 for
Aluminum 1145 in accordance with Practice E527. Aluminum and Aluminum Alloys for Determination of
Chemical Composition by Spectrochemical Analysis
1.4 For acceptance criteria for inclusion of new aluminum
E1251 Test Method for Analysis of Aluminum and Alumi-
and aluminum alloys in this specification, see Annex A1.
num Alloys by Spark Atomic Emission Spectrometry
1.5 The values stated in inch-pound units are to be regarded
2.3 ANSI Standard:
as the standard. The values given in parentheses are for
H35.1 Alloy and Temper Designation Systems for Alumi-
information only.
num
2. Referenced Documents
3. Terminology
2.1 The following documents of the issue in effect on the
3.1 Definitions:
dateofmaterialpurchaseformapartofthisspecificationtothe
3.1.1 foil—a rolled product rectangular in cross section of
extent referenced herein.
thickness less than 0.006 in. (0.15 mm).
2.2 ASTM Standards:
3.1.2 matte one-side foil (M1S)—foil with a diffuse reflect-
B193 Test Method for Resistivity of Electrical Conductor ing finish (matte) on one side and bright specular finish on the
Materials
other (10.1).
E29 Practice for Using Significant Digits in Test Data to
3.1.3 dry annealed A—having a test dryness of 100/0, free
Determine Conformance with Specifications
from residual rolling oil, as determined by the water test
E34 Test Methods for Chemical Analysis of Aluminum and
(10.2.1).
Aluminum-Base Alloys
3.1.4 dry annealed B—having a test dryness of 90/10, a
E55 Practice for Sampling Wrought Nonferrous Metals and
slight film of residual rolling oil, as determined by the
Alloys for Determination of Chemical Composition
water-alcohol test (10.2.2).
E227 Test Method for Optical Emission Spectrometric
3.1.5 dry annealed C—having a test dryness of 80/20, a
Analysis of Aluminum and Aluminum Alloys by the
slight film of residual rolling oil, as determined by the
water-alcohol test (10.2.3).
This specification is under the jurisdiction of ASTM Committee B07 on Light
3.1.6 slick annealed—having a uniform film of residual
Metals and Alloys and is the direct responsibility of Subcommittee B07.03 on
rolling oil or applied oil as determined by the water test
Aluminum Alloy Wrought Products.
Current edition approved Nov. 1, 2006. Published December 2006. Originally
(10.2.4).
approved in 1961. Last previous edition approved in 2000 as B373–00. DOI:
10.1520/B0373-00R06.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The last approved version of this historical standard is referenced on
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM www.astm.org.
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B373−00 (2006)
A,B,C
TABLE 1 Chemical Requirements
D
Aluminum Silicon Other Elements
Copper Manganese Magnesium Zinc Vanadium Titanium Aluminum
Designation plus Iron Each Total
E
1145 0.55 0.05 0.05 0.05 0.05 0.05 0.03 0.03 . 99.45 min
E
1235 0.65 0.05 0.05 0.05 0.10 0.05 0.06 0.03 . 99.35 min
A
Limits are in percent maximum unless stated otherwise.
B
Analysis shall be made for the elements for which limits are shown in this table.
C
For purposes of determining the conformance to these limits, an observed value or a calculated value attained from analysis shall be rounded to the nearest unit in the
last right-hand place of figures used in expressing the specified limit, in accordance with the rounding method of Practice E29.
D
Others includes all unlisted metallic elements. The producer may analyze samples for trace elements not specified in the specification. However, such analysis is not
required and may not cover all metallic Others elements. Should any analysis by the producer or the purchaser establish that an Others element exceeds the limit of Each
or that the aggregate of several Others elements exceeds the limit of Total, the material shall be considered nonconforming.
E
The minimum content shall be calculated by subtracting from 100.00 %, the sum of all metallic elements present in amounts of 0.010 % or more, each roundedtothe
second decimal before determining the sum.
3.1.7 producer—the primary manufacturer of the material. where such inspections are deemed necessary to assure that the
material conforms to prescribed requirements.
3.1.8 supplier—includes only the category of jobbers and
distributors as distinct from producers.
6.2 Lot Definition—An inspection lot shall consist of an
identifiable quantity of material of the same alloy, temper, and
3.2 Definitions of Terms Specific to This Standard:
nominal dimensions subjected to inspection at one time.
3.2.1 capable of—The term capable of as used in this
specification means that the test need not be performed by the
7. Chemical Composition
producer of the material. However, should subsequent testing
7.1 Limits—The foil shall conform to the chemical compo-
by the purchaser establish that the material does not meet these
sition limits prescribed in Table 1. Conformance shall be
requirements, the material shall be subject to rejection.
determined by the producer by analyzing samples taken at the
time the ingots are poured, or samples taken from the finished
4. Ordering Information
or semi-finished product. If the producer of the foil or the
4.1 Orders for material to this specification shall include the
producer of the material from which the foil is produced has
following information:
determinedthechemicalcompositionofthematerialduringthe
4.1.1 This specification designation (which includes the
course of manufacture, sampling and analysis of the finished
number, the year, and the revision letter, if applicable),
product shall not be required.
4.1.2 Quantity in pounds,
NOTE 1—It is standard practice in the United States aluminum industry
4.1.3 Aluminum designation (Section 7),
to determine conformance to the chemical composition limits prior to
4.1.4 Nominal thickness and width (Section 11),
further processing of ingots into wrought products. Due to the continuous
4.1.5 Surface condition (Section 10),
nature of the process, it is not practical to keep a specific ingot analysis
4.1.6 Outside diameter of rolls (Section 13),
identified with a specific quantity of finished material.
4.1.7 Inside diameter of cores (Section 13);
7.2 Number of Samples—The number of samples taken to
determine chemical composition shall be as follows:
4.2 Additionally, orders for material to this specification
shall include the following information when required by the 7.2.1 When samples are taken at the time the ingots are
poured, at least one sample shall be taken for each group of
purchaser:
4.2.1 Whether inspection or witness of inspection and tests ingots poured simultaneously from the same source of molten
metal.
by the purchaser’s representative is required prior to material
shipment (Section 16), and 7.2.2 When samples are taken from the finished or semi-
finished product, a sample shall be taken to represent each
4.2.2 Whether certification is required (Section 18).
1000 lb (454 kg), or fraction thereof, of material in the lot,
5. Manufacturing Process Changes
except that not more than one sample shall be required per
piece.
5.1 No process changes shall be made in the manufacture of
this material after initially approved by the purchaser, except
7.3 Methods of Sampling—Samples for determination of
by prior agreement between the purchaser and the producer.
chemical composition shall be taken in accordance with one of
the following methods:
6. Responsibility for Quality Assurance
7.3.1 Samples for chemical analysis shall be taken from the
6.1 Responsibility for Inspection and Tests—Unless other- material by drilling, sawing, milling, turning, clipping, etc., a
wise specified in the contract or purchase order, the producer is representative piece or pieces to obtain a weight of prepared
responsible for the performance of all inspection and test sample not less than 75 g. Sampling shall be in accordance
requirements specified herein. Except as otherwise specified in with Practice E55.
the contract or order, the producer may use his own or any 7.3.2 Sampling for spectrochemical analysis shall be in
other suitable facilities for the performance of the inspection accordance with Practices E716. Samples for other methods of
and test requirements specified herein, unless disapproved by analysis shall be taken by methods suitable for the form of
the purchaser. The purchaser shall have the right to perform material being analyzed and the type of analytical method
any of the inspections and tests set forth in this specification used.
B373−00 (2006)
where the evidence indicates that the specimen failure may be related to
7.4 Methods of Analysis—The determination of chemical
testing conditions.
composition shall be made in accordance with suitable chemi-
cal (Test Methods E34), or spectrochemical (Test Methods
9. Electrical Properties
E227,E607,andE1251),methods.Othermethodsmaybeused
only when no publishedASTM method is available. In case of 9.1 Electrical Resistance—The foil shall be capable of
conforming to the direct current electrical resistance require-
dispute, the methods of analysis shall be agreed upon between
the producer and the purchaser. ments prescribed in Table 3 when measured at a temperature
between 60 and 80°F (15 and 25°C).
8. Mechanical Properties
NOTE 3—Direct-current electrical resistance values listed in Table 3 are
8.1 Tensile Breaking Load—The foil shall be capable of based on a minimum electrical conductivity of 58.5 % IACS and the
minimum permissible foil thickness corresponding with each nominal
conforming to the tensile breaking load requirements pre-
thickness.
scribed in Table 2. Splices shall be capable of developing 80 %
9.2 Number of Specimens—When electrical resistance is
of the breaking load specified for unspliced foil.
determined, tests shall be made on samples from each 1000 lb
8.2 Number of Specimens—When tensile breaking load is
(454 kg), or fraction thereof, of each thickness and width of
determined, tests shall be made on samples from each 1000 lb
coil in a lot. Not less than two samples shall be selected with
(454 kg), or fraction thereof, of each thickness and width of
each sample from a different roll of foil except that if the lot
coil in a lot. Not less than two samples shall be selected with
consists of only one roll of foil, one sample shall be selected.
each sample from a different roll of foil except that if the lot
9.3 Method of Test—When electrical resistance is
consists of only one roll of foil, one sample shall be selected.
determined, this determination shall be made by any method
Each sample shall consist of either a single-thickness or
having an accuracy of 60.001Ω, provided that in the case of
multiple-thickness specimen from one roll of foil.
dispute, the results obtained by Test Method B193 shall be the
8.3 Test Method—For determination of tensile breaking
basis for acceptance.
load, tests shall be made in accordance with Test Methods
E345. If breaking load tests of a sample are made by both
10. Surface Condition
single-thickness specimens (Type B) and by multiplethickness
10.1 The foil shall be supplied with the finish bright on one
specimens (Type A) and the results do not agree with each
side and matte on the other.
other, the results of the tests of the single-thickness specimens
shall be the basis for acceptance or rejection of the material.
10.2 The foil shall be supplied in the dry or slick condition,
as specified on the purchase order. The foil shall be tested for
8.4 Retests—If any test specimen for tensile breaking load
surface condition by spraying, as from a squeeze bottle, a
fails to conform to the requirements prescribed in Table 2, two
continuous line of distilled water or distilled water-alcohol
additional specimens shall be selected from other representa-
mixture across the web of foil inclined 30° from horizontal. To
tive rolls in the inspection lot, or from the same roll if the lot
ensure an acceptable water-alcohol mixture, the alcohol dena-
consists of only one roll, and tested. If either of these
turant shall be methanol (Formula 30—ten parts ethyl alcohol
specimens fails to conform to the applicable requirements, the
and one part methanol by volume) or equivalent. Foil dryness
material may be rejected. If, however, the failure of the foil to
is categorized by the water or water-alcohol test in which the
conform to the requirements is the result of an inadequate
foil will support a continuous unbroken line across the web for
thermal treatment, the material may be reannealed and resa-
2 s. (The unbroken line is the top of the band of water or
mpled in accordance with 7.2. Only one such reworking of
mixture across the web.)
material shall be permitted.
10.2.1 Dry Annealed A (test dryness 100/0)—Foil shall
NOTE2—Experienceoftestingoffoilhasdemonstratedthatfailuresare
support a continuous unbroken line using 100 % distilled
more likely due to faulty test specimens, or to misalignment of the
specimen in the testing machine, than is the case with
...
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