ASTM B926-03
(Test Method)Standard Method for Pinhole Determination in Aluminum and Aluminum Alloy Plain Foil by Means of a Light Table
Standard Method for Pinhole Determination in Aluminum and Aluminum Alloy Plain Foil by Means of a Light Table
SIGNIFICANCE AND USE
Foil in thickness of about 0.002 in. (0.05 mm) and heavier is virtually free of pinholes. With decrease in thickness, the number of pinholes may increase.
This method is provided to develop and maintain uniformity in the methods of evaluating pinholes in aluminum foil. The pinhole data provides assessments of process capability and quality levels of the foil as well.
SCOPE
1.1 This method covers the identification and counting of pinholes, including roll holes, in plain foil using a light table, and inspector with normal 20/20 or corrected 20/20 vision, and a darkened inspection area.
1.2 This method may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:B926–03
Standard Method for
Pinhole Determination in Aluminum and Aluminum Alloy
Plain Foil by Means of a Light Table
This standard is issued under the fixed designation B926; 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.
1. Scope 3.1.3 pinhole—any small void in the foil that will permit the
transmission of light. Classification criteria for pinholes limits
1.1 This method covers the identification and counting of
these voids to those that are too small in size to be clearly
pinholes, including roll holes, in plain foil using a light table,
visible to the unaided eye (13 visual inspection).
and inspector with normal 20/20 or corrected 20/20 vision, and
3.1.4 roll hole—the producer’s classification of a pinhole
a darkened inspection area.
caused by an imperfection on any type of roll the foil contacts
1.2 This method may involve hazardous materials, opera-
during production. The distinguishing feature of a roll hole(s)
tions, and equipment. This standard does not purport to
is the repeatability of this void on a regular interval. This
address all of the safety concerns, if any, associated with its
interval is directly proportional to the circumference of the roll
use. It is the responsibility of the user of this standard to
causing the void (this interval will also increase proportionally
establish appropriate safety and health practices and deter-
to subsequent thickness reductions).
mine the applicability of regulatory limitations prior to use.
4. Summary of Method
2. Referenced Documents
4.1 This method contains guidelines for determining the
2.1 ASTM Standards:
number of pinholes present in the area with the highest pinhole
B373 Specification for Aluminum Foil for Capacitors
concentration in a sample of foil.
B479 Specification for Annealed Aluminum and
4.2 A full width sample is placed on the light table, and the
Aluminum-Alloy Foil for Flexible Barrier, Food Contact,
pinholes are counted in a sample of known area (five or more
and Other Applications
square feet).
E252 Test Method for Thickness of Foil, Thin Sheet, and
Film by Mass Measurement
5. Significance and Use
3. Terminology 5.1 Foil in thickness of about 0.002 in. (0.05 mm) and
heavierisvirtuallyfreeofpinholes.Withdecreaseinthickness,
3.1 Definitions:
the number of pinholes may increase.
3.1.1 calibration—determination of the values of the sig-
5.2 This method is provided to develop and maintain
nificant parameter(s) by comparison with a value(s) indicated
uniformity in the methods of evaluating pinholes in aluminum
by a reference instrument or by a set of reference standards.
foil. The pinhole data provides assessments of process capa-
3.1.2 foil—a rolled metallic product rectangular in cross-
bility and quality levels of the foil as well.
section and of a thickness less than 0.006 in. (0.15 mm). This
method was developed based on aluminum foil, but could be
6. Apparatus
applied to other types of metallic foil as well.
6.1 Alight table which provides illumination between 1500
and 1800 lux light intensity with a smooth and uniform
inspection surface on which the foil is examined. The light
This test method is under the jurisdiction of ASTM Committee B07 on Light
table must be in a black booth or in an area where the lights are
Metals and Alloys and is the direct responsibility of Subcommittee B07.03 on
turned off to provide darkness of less than 50 lux. The light
Aluminum Alloy Wrought Products.
table should be able to accommodate the widest width of foil
Current edition approvedApril 10, 2003. PublishedAugust 2003. DOI: 10.1520/
B0926
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