ASTM D6988-08
(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.
1.3 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—This standard and ISO 4593 address the same subject matter but differ in technical content.
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Designation: D6988 − 08
StandardGuide for
1
Determination of Thickness of Plastic Film Test Specimens
This standard is issued under the fixed designation D6988; 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* 2.2 ISO Standard:
4
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 D883 and D4805, and
except as otherwise required in material specifications or in
applicable test standards. ISO 472 for definitions pertinent to this guide.
NOTE 1—Films are defined as having thicknesses ≤0.250 mm [≤0.010
3.2 Definitions of Terms Specific to This Standard:
in.].
3.2.1 absolute uncertainty (of a measurement), n—the
NOTE 2—Alternative methods are acceptable if they meet the require-
smallest division that can be read directly on the instrument
ments of measurement precision as noted in this guide.
NOTE 3—This guide is not intended to address the sampling techniques
used for measurement.
or the measurement of film thickness for the commercial classification of
3.2.2 calibration, n—the set of operations that establishes,
commercial products or for quality control purposes.
under specified conditions, the relationship between values
1.2 The values stated in SI units are to be regarded as the
measured or indicated by an instrument or system, and the
standard.
corresponding reference standard or known values derived
1.3 This standard does not purport to address all of the
from the appropriate reference standards.
safety concerns, if any, associated with its use. It is the
3.2.3 dead-weight micrometer, n—an instrument capable of
responsibility of the user of this standard to establish appro-
measuringthethicknessofthinfilmsutilizingaweighttoapply
priate safety and health practices and determine the applica-
uniform pressure to the specimen.
bility of regulatory requirements prior to use.
3.2.4 verification, n—proof, with the use of calibrated stan-
NOTE 4—This standard and ISO 4593 address the same subject matter
dards or standard reference materials that the calibrated instru-
but differ in technical content.
ment is operating within specified requirements.
2. Referenced Documents
4. Summary of Methods
2
2.1 ASTM Standards:
4.1 This guide describes four different methods for the
D618 Practice for Conditioning Plastics for Testing
thickness measurement of plastic film specimens.The methods
D883 Terminology Relating to Plastics
(identified as Methods A, B, C, and D) use different microm-
D4805 Terminology for Plastics Standards (Withdrawn
3 eters that actuate the weights in different manners or utilize
2002)
different means of reading the thickness.
D5947 Test Methods for Physical Dimensions of Solid
Plastics Specimens 4.2 It is permissible to use other instruments, including
D6287 Practice for Cutting Film and Sheeting Test Speci-
non-contact instruments and instruments using alternative
mens readout systems in place of dials provided they meet or exceed
the precision requirements noted in this practice.
1
This guide is under the jurisdiction of ASTM Committee D20 on Plastics and
5. Significance and Use
is the direct responsibility of Subcommittee D20.19 on Film, Sheeting, and Molded
Products.
5.1 This guide is intended to provide recommendations and
Current edition approved Nov. 1, 2008. Published November 2008. Originally
suggested good practices to determine precise dimensions
approved in 2003. Last previous edition approved in 2007 as D6988 - 07. DOI:
when necessary for the calculation of properties expressed in
10.1520/D6988-08.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or physical units. It is not intended to replace practical thickness
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
the ASTM website.
3 4
The last approved version of this historical standard is referenced on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
www.astm.org. 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
1
---------------------- Page: 1 ----------------------
D6988 − 08
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 m
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D6988–07 Designation:D6988–08
Standard Guide for
1
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 (´) indicates an editorial change since the last revision or reapproval.
1. 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.
1.3 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.
NOTE4—ISO 4593 is similar but differs in technical content and scope. 4—This standard and ISO 4593 address the same subject matter but differ in
technical content.
2. Referenced Documents
2
2.1 ASTM Standards:
D 618 Practice for Conditioning Plastics for Testing
D 883 Terminology Relating to Plastics
3
D 4805 Terminology for Plastics Standards
D 5947 Test Methods for Physical Dimensions of Solid Plastics Specimens
D 6287 Practice for Cutting Film and Sheeting Test Specimens
1
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 .
Current edition approved MarchNov. 1, 2007.2008. Published March 2007.November 2008. Originally approved in 2003. Last previous edition approved in 20032007 as
D 6988 - 037.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Withdrawn.
*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.
1
---------------------- Page: 1 ----------------------
D6988–08
2.2 ISO Standard:
4
ISO 472 Plastics—Vocabulary
3. Terminology
3.1 Definitions—See Terminologies D 883 and D 4805, and ISO 472 for definitions pertinent to this guide.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 absolute uncertainty (of a measurement), n—the smallest division that can be read directly on the instrument used for
measurement.
3.2.2 calibration, n—thesetofoperationsthatestablishes,underspecifiedconditions,therelationshipbetweenvaluesmeasured
or indicated by an instrument or system, and the corresponding reference standard or known values derived from the appropriate
reference standards.
3.2.3 dead-weight micrometer, n—an instrument capable of measuring the thickness of thin films utilizing a weight to apply
uniform pressure to the specimen.
3.2.4 verification, n—proof, with the use of calibrated standards or standard reference materials that the calibrated instrument
is operating within specified requirements.
4. Summary of Methods
4.1 This guide describes four different methods for the thickness measurement of plastic film specimens. The methods
(identified as Methods A, B, C, and D) use different micrometers that actuate the weights in different manners or utilize different
means of reading the thickness.
4.2 It is permissible to use other instruments, including non-contact instruments and instruments using alternative readout
systems in place of dials provided they meet or exceed the precision requirements noted in this practice.
5. Significance and Use
5.1 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 thick
...
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