ASTM B373-00
(Specification)Standard Specification for Aluminum Foil for Capacitors
Standard Specification for Aluminum Foil for Capacitors
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 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.
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Designation: B 373 – 00
Standard Specification for
Aluminum Foil for Capacitors
This standard is issued under the fixed designation B 373; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope E 345 Test Methods of Tension Testing of Metallic Foil
E 527 Practice for Numbering Metals and Alloys (UNS)
1.1 This specification covers nine thicknesses (0.00017 to
E 607 Test Method for Optical Emission Spectrometric
0.00050 in. (0.0043 to 0.0127 mm)) of annealed aluminum foil
Analysis of Aluminum and Aluminum Alloys by the
used in the manufacture of capacitors.
Point-to-Plane Technique, Nitrogen Atmosphere
1.2 Foil to be used as anodes in electrolytic capacitors is
E 716 Practices for Sampling Aluminum and Aluminum
beyond the scope of this specification.
Alloys for Spectrochemical Analysis
1.3 Alloy designations are in accordance withANSI H35.1.
E 1251 Test Method for Optical Emission Spectrometric
The equivalent Unified Numbering System alloy designations
Analysis ofAluminum andAluminumAlloys by theArgon
are those of Table 1 preceded by A9, for example, A91145 for
Atmosphere, Point-to-Plane, Unipolar Self-Initiating Ca-
Aluminum 1145 in accordance with Practice E 527.
pacitor Discharge
1.4 For acceptance criteria for inclusion of new aluminum
2.3 ANSI Standard:
and aluminum alloys in this specification, see Annex A1.
H35.1 Alloy and Temper Designation Systems for Alumi-
1.5 The values stated in inch-pound units are to be regarded
num
as the standard. The values given in parentheses are for
information only.
3. Terminology
2. Referenced Documents 3.1 Definitions:
3.1.1 foil—a rolled product rectangular in cross section of
2.1 The following documents of the issue in effect on the
thickness less than 0.006 in. (0.15 mm).
date of material purchase form a part of this specification to the
3.1.2 matte one-side foil (M1S)—foil with a diffuse reflect-
extent referenced herein.
ing finish (matte) on one side and bright specular finish on the
2.2 ASTM Standards:
other (10.1).
B 193 Test Method for Resistivity of Electrical Conductor
3.1.3 dry annealed A—having a test dryness of 100/0, free
Materials
from residual rolling oil, as determined by the water test
E 29 Practice for Using Significant Digits in Test Data to
(10.2.1).
Determine Conformance with Specifications
3.1.4 dry annealed B—having a test dryness of 90/10, a
E 34 Test Methods for ChemicalAnalysis ofAluminum and
slight film of residual rolling oil, as determined by the
Aluminum Base Alloys
water-alcohol test (10.2.2).
E 55 PracticeforSamplingWroughtNonferrousMetalsand
3.1.5 dry annealed C—having a test dryness of 80/20, a
Alloys for Determination of Chemical Composition
slight film of residual rolling oil, as determined by the
E 227 Test Method for Optical Emission Spectrometric
water-alcohol test (10.2.3).
Analysis of Aluminum and Aluminum Alloys by the
4 3.1.6 slick annealed—having a uniform film of residual
Point-to-Plane Technique
rolling oil or applied oil as determined by the water test
E 252 Test Method for Thickness of Thin Foil and Film by
5 (10.2.4).
Weighing
3.1.7 producer—the primary manufacturer of the material.
3.1.8 supplier—includes only the category of jobbers and
This specification is under the jurisdiction of ASTM Committee B07 on Light
distributors as distinct from producers.
Metals and Alloys and is the direct responsibility of Subcommittee B07.03 on
3.2 Definitions of Terms Specific to This Standard:
Aluminum Alloy Wrought Products.
Current edition approved May 10, 2000. Published August 2000. Originally
published as B 373–61T. Last previous edition B 373–95.
Annual Book of ASTM Standards, Vol 02.03.
3 6
Annual Book of ASTM Standards, Vol 14.02. Annual Book of ASTM Standards, Vol 03.01.
4 7
Annual Book of ASTM Standards, Vol 03.05. Annual Book of ASTM Standards, Vol 01.01.
5 8
Annual Book of ASTM Standards, Vol 02.02. Annual Book of ASTM Standards, Vol 03.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 373
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 E 29.
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.
3.2.1 capable of—The term capable of as used in this 7. Chemical Composition
specification means that the test need not be performed by the
7.1 Limits—The foil shall conform to the chemical compo-
producer of the material. However, should subsequent testing
sition limits prescribed in Table 1. Conformance shall be
by the purchaser establish that the material does not meet these
determined by the producer by analyzing samples taken at the
requirements, the material shall be subject to rejection.
time the ingots are poured, or samples taken from the finished
or semi-finished product. If the producer of the foil or the
4. Ordering Information
producer of the material from which the foil is produced has
4.1 Orders for material to this specification shall include the
determinedthechemicalcompositionofthematerialduringthe
following information:
course of manufacture, sampling and analysis of the finished
4.1.1 This specification designation (which includes the
product shall not be required.
number, the year, and the revision letter, if applicable),
NOTE 1—It is standard practice in the United States aluminum industry
4.1.2 Quantity in pounds,
to determine conformance to the chemical composition limits prior to
4.1.3 Aluminum designation (Section 7),
further processing of ingots into wrought products. Due to the continuous
4.1.4 Nominal thickness and width (Section 11),
nature of the process, it is not practical to keep a specific ingot analysis
4.1.5 Surface condition (Section 10),
identified with a specific quantity of finished material.
4.1.6 Outside diameter of rolls (Section 13),
7.2 Number of Samples—The number of samples taken to
4.1.7 Inside diameter of cores (Section 13);
determine chemical composition shall be as follows:
4.2 Additionally, orders for material to this specification
7.2.1 When samples are taken at the time the ingots are
shall include the following information when required by the
poured, at least one sample shall be taken for each group of
purchaser:
ingots poured simultaneously from the same source of molten
4.2.1 Whether inspection or witness of inspection and tests
metal.
by the purchaser’s representative is required prior to material
7.2.2 When samples are taken from the finished or semi-
shipment (Section 16), and
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,
except that not more than one sample shall be required per
5. Manufacturing Process Changes
piece.
5.1 No process changes shall be made in the manufacture of
7.3 Methods of Sampling—Samples for determination of
this material after initially approved by the purchaser, except
chemical composition shall be taken in accordance with one of
by prior agreement between the purchaser and the producer.
the following methods:
6. Responsibility for Quality Assurance 7.3.1 Samples for chemical analysis shall be taken from the
material by drilling, sawing, milling, turning, clipping, etc., a
6.1 Responsibility for Inspection and Tests—Unless other-
representative piece or pieces to obtain a weight of prepared
wise specified in the contract or purchase order, the producer is
sample not less than 75 g. Sampling shall be in accordance
responsible for the performance of all inspection and test
with Practice E 55.
requirements specified herein. Except as otherwise specified in
7.3.2 Sampling for spectrochemical analysis shall be in
the contract or order, the producer may use his own or any
accordance with Practices E 716. Samples for other methods of
other suitable facilities for the performance of the inspection
analysis shall be taken by methods suitable for the form of
and test requirements specified herein, unless disapproved by
material being analyzed and the type of analytical method
the purchaser. The purchaser shall have the right to perform
used.
any of the inspections and tests set forth in this specification
where such inspections are deemed necessary to assure that the 7.4 Methods of Analysis—The determination of chemical
material conforms to prescribed requirements. composition shall be made in accordance with suitable chemi-
6.2 Lot Definition—An inspection lot shall consist of an cal (Test Methods E 34), or spectrochemical (Test Methods
identifiable quantity of material of the same alloy, temper, and E 227, E 607, and E 1251), methods. Other methods may be
nominal dimensions subjected to inspection at one time. used only when no published ASTM method is available. In
B 373
case of dispute, the methods of analysis shall be agreed upon ments prescribed in Table 3 when measured at a temperature
between the producer and the purchaser. between 60 and 80°F (15 and 25°C).
NOTE 3—Direct-current electrical resistance values listed inTable 3 are
8. Mechanical Properties
based on a minimum electrical conductivity of 58.5 % IACS and the
8.1 Tensile Breaking Load—The foil shall be capable of minimum permissible foil thickness corresponding with each nominal
thickness.
conforming to the tensile breaking load requirements pre-
scribed inTable 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 deter-
consists of only one roll of foil, one sample shall be selected.
mined, this determination shall be made by any method having
Each sample shall consist of either a single-thickness or
an accuracy of 60.001 V, provided that in the case of dispute,
multiple-thickness specimen from one roll of foil.
theresultsobtainedbyTestMethodB 193shallbethebasisfor
8.3 Test Method—For determination of tensile breaking
acceptance.
load, tests shall be made in accordance with Test Methods
E 345. 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
10.2 The foil shall be supplied in the dry or slick condition,
shall be the basis for acceptance or rejection of the material.
8.4 Retests—If any test specimen for tensile breaking load as specified on the purchase order. The foil shall be tested for
surface condition by spraying, as from a squeeze bottle, a
fails to conform to the requirements prescribed in Table 2, two
additional specimens shall be selected from other representa- continuous line of distilled water or distilled water-alcohol
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
consists of only one roll, and tested. If either of these ensure an acceptable water-alcohol mixture, the alcohol dena-
turant shall be methanol (Formula 30—ten parts ethyl alcohol
specimens fails to conform to the applicable requirements, the
material may be rejected. If, however, the failure of the foil to and one part methanol by volume) or equivalent. Foil dryness
is categorized by the water or water-alcohol test in which the
conform to the requirements is the result of an inadequate
thermal treatment, the material may be reannealed and resa- foil will support a continuous unbroken line across the web for
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
material shall be permitted. mixture across the web.)
10.2.1 Dry Annealed A (test dryness 100/0)—Foil shall
NOTE 2—Experienceoftestingoffoilhasdemonstratedthatfailuresare
support a continuous unbroken line using 100 % distilled
more likely due to faulty test specimens, or to misalignment of the
water.Alternatively, the foil may be tested by a distilled water
specimen in the testing machine, than is the case with material having a
greater section thickness. Care must be exercised to discard test results drop test, in which case the drops shall spread evenly into a
where the evidence indicates that the specimen failure may be related to
thin film.
testing conditions.
10.2.2 Dry Annealed B (test dryness 90/10)—Foil shall
support a continuous unbroken line using a mixture of 90 %
9. Electrical Properties
distilled water and 1
...
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