ASTM D6988-07
(Guide)Standard Guide for Determination of Thickness of Plastic Film Test Specimens
Standard Guide for Determination of Thickness of Plastic Film Test Specimens
SIGNIFICANCE AND USE
This guide is intended to provide recommendations and suggested good practices to determine precise dimensions when necessary for the calculation of properties expressed in physical units. It is not intended to replace practical thickness measurements based on commercial portable tools, nor is it implied that thickness measurements made by the procedures will agree exactly.
SCOPE
1.1 This guide covers the determination of the thickness of plastic films where the thickness is used directly in determining the results of tests for various properties. Use this practice except as otherwise required in material specifications or in applicable test standards.Note 1
Films are defined as having thicknesses 0.250 mm [0.010 in.].Note 2
Alternative methods are acceptable if they meet the requirements of measurement precision as noted in this guide.Note 3
This guide is not intended to address the sampling techniques or the measurement of film thickness for the commercial classification of commercial products or for quality control purposes.
1.2 The values stated in SI units are to be regarded as the standard.
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 requirements prior to use.Note 4
ISO 4593 is similar but differs in technical content and scope.
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Designation:D6988–07
Standard Guide for
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Determination of Thickness of Plastic Film Test Specimens
This standard is issued under the fixed designation D 6988; 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.
1. Scope* 2.2 ISO Standard:
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ISO 472 Plastics—Vocabulary
1.1 This guide covers the determination of the thickness of
plasticfilmswherethethicknessisuseddirectlyindetermining
3. Terminology
the results of tests for various properties. Use this practice
3.1 Definitions—See Terminologies D 883 and D 4805, and
except as otherwise required in material specifications or in
ISO 472 for definitions pertinent to this guide.
applicable test standards.
3.2 Definitions of Terms Specific to This Standard:
NOTE 1—Films are defined as having thicknesses#0.250 mm [#0.010
3.2.1 absolute uncertainty (of a measurement), n—the
in.].
smallest division that can be read directly on the instrument
NOTE 2—Alternative methods are acceptable if they meet the require-
used for measurement.
ments of measurement precision as noted in this guide.
3.2.2 calibration, n—the set of operations that establishes,
NOTE 3—This guide is not intended to address the sampling techniques
under specified conditions, the relationship between values
or the measurement of film thickness for the commercial classification of
commercial products or for quality control purposes. measured or indicated by an instrument or system, and the
corresponding reference standard or known values derived
1.2 The values stated in SI units are to be regarded as the
from the appropriate reference standards.
standard.
3.2.3 dead-weight micrometer, n—an instrument capable of
1.3 This standard does not purport to address all of the
measuringthethicknessofthinfilmsutilizingaweighttoapply
safety concerns, if any, associated with its use. It is the
uniform pressure to the specimen.
responsibility of the user of this standard to establish appro-
3.2.4 verification, n—proof, with the use of calibrated
priate safety and health practices and determine the applica-
standards or standard reference materials that the calibrated
bility of regulatory requirements prior to use.
instrument is operating within specified requirements.
NOTE 4—ISO 4593 is similar but differs in technical content and scope.
4. Summary of Methods
2. Referenced Documents
4.1 This guide describes four different methods for the
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2.1 ASTM Standards:
thickness measurement of plastic film specimens.The methods
D 618 Practice for Conditioning Plastics for Testing
(identified as MethodsA, B, C, and D) use different microme-
D 883 Terminology Relating to Plastics
ters that actuate the weights in different manners or utilize
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D 4805 Terminology for Plastics Standards
different means of reading the thickness.
D 5947 Test Methods for Physical Dimensions of Solid
4.2 It is permissible to use other instruments, including
Plastics Specimens
non-contact instruments and instruments using alternative
D 6287 Practice for Cutting Film and Sheeting Test Speci-
readout systems in place of dials provided they meet or exceed
mens
the precision requirements noted in this practice.
5. Significance and Use
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5.1 This guide is intended to provide recommendations and
This guide is under the jurisdiction of ASTM Committee D20 on Plastics and
is the direct responsibility of Subcommittee D20.19 on Film and Sheeting. suggested good practices to determine precise dimensions
Current edition approved March 1, 2007. Published March 2007. Originally
when necessary for the calculation of properties expressed in
approved in 2003. Last previous edition approved in 2003 as D 6988 - 03.
physical units. It is not intended to replace practical thickness
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
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the ASTM website. Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
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Withdrawn. 4th Floor, New York, NY 10036.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6988–07
measurements based on commercial portable tools, nor is it 6.3.2 A preferred drop rate between 0.750 and 1.500 mm/s
implied that thickness measurements made by the procedures between 0.625 and 0.025 mm on the dial and a capacity of at
will agree exactly. least 0.775 mm.
6.4 Apparatus C—Manually Opera
...
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