ASTM D4708-19
(Practice)Standard Practice for Preparation of Uniform Free Films of Organic Coatings
Standard Practice for Preparation of Uniform Free Films of Organic Coatings
SIGNIFICANCE AND USE
4.1 Free films are required for conducting tests to evaluate physical and mechanical properties such as tensile and elongation (Test Methods D2370), moisture vapor permeability (Test Methods D1653 and E96/E96M), microbiological activity resistance (Test Method D5590), and other physical properties of organic coatings where the substrate may interfere with the determination.
SCOPE
1.1 This practice covers the preparation of free films of organic coatings for use in determining the physical properties of the coatings.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D4708 − 19
Standard Practice for
1
Preparation of Uniform Free Films of Organic Coatings
This standard is issued under the fixed designation D4708; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 3. Summary of Test Method
1.1 This practice covers the preparation of free films of 3.1 Free films are prepared by depositing a uniform wet
organic coatings for use in determining the physical properties coating of the test material on a release substrate. The applied
of the coatings.
films are dried or baked, cut into appropriate size for the
intended physical property test, and then stripped from the
1.2 The values stated in SI units are to be regarded as the
release substrate.
standard. The values given in parentheses are for information
only.
4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 Free films are required for conducting tests to evaluate
safety concerns, if any, associated with its use. It is the
physical and mechanical properties such as tensile and elon-
responsibility of the user of this standard to establish appro-
gation (Test Methods D2370), moisture vapor permeability
priate safety, health, and environmental practices and deter-
(Test Methods D1653 and E96/E96M), microbiological activ-
mine the applicability of regulatory limitations prior to use.
ity resistance (Test Method D5590), and other physical prop-
1.4 This international standard was developed in accor-
erties of organic coatings where the substrate may interfere
dance with internationally recognized principles on standard-
with the determination.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5. Apparatus and Materials
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5.1 Equipment, for applying films of uniform thickness as
described in Practices D823.
2. Referenced Documents
2 5.2 Micrometer Film Thickness Gage, as described in Test
2.1 ASTM Standards:
Method D1005.
D823Practices for Producing Films of Uniform Thickness
of Paint, Coatings and Related Products on Test Panels 5.3 Release Substrates, any film releasing flat substrate
D1005Test Method for Measurement of Dry-Film Thick-
which does not alter film properties and which allows the
ness of Organic Coatings Using Micrometers casting of coating films with a uniform thickness. Examples of
D1653Test Methods for Water Vapor Transmission of Or-
suitable substrates are as follows:
ganic Coating Films
5.3.1 Sheet of FEP—(polyhexafluoropropylene).
D2370Test Method for Tensile Properties of Organic Coat-
5.3.2 Sheet of Silicone Coated Paper, preferably 125-µm
ings
(5-mil) thick.
D5590Test Method for Determining the Resistance of Paint
5.3.3 Glass Plates, coated with halosilane compound.
Films and Related Coatings to Fungal Defacement by
5.3.4 Steel Panel—Wrapped with polyvinyl fluoride film,
Accelerated Four-Week Agar Plate Assay
preferably 25 to 50–µm (1 to 2 mils) thick.
E96/E96MTest Methods for Water Vapor Transmission of
5.3.5 Flat Panel—Coated with release agent.
Materials
5.3.6 Polytetrafluoroethylene Sheet (with or without glass
fiber reinforcement) wiped with diluted surfactant solution as
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and needed.
Related Coatings, Materials, and Applications and is the direct responsibility of
5.3.7 Polyethylene Film preferably 50 µm in thickness,
Subcommittee D01.23 on Physical Properties of Applied Paint Films.
wrapped around a glass sheet.
Current edition approved March 1, 2019. Published August 2019. Originally
approved in 1987. Last previous edition approved in 2012 as D4708–12. DOI:
5.4 Surfactant Solution—Diluted surfactant solution. Fluo-
10.1520/D4708-19.
rinated surfactants are preferred due to their high efficiency.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
NOTE 1—Solution comprising 0.5 to 1% fluorinated surfactant in
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 isopropyl alcohol was found to be suitable for some coatings. Check that
the ASTM website. the use of surfactant does not alter the coating film properties to be tested.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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: D4708 − 12 D4708 − 19
Standard Practice for
1
Preparation of Uniform Free Films of Organic Coatings
This standard is issued under the fixed designation D4708; 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 practice covers the preparation of free films of organic coatings for use in determining the physical properties of the
coatings. Procedures are given for preparing free films on three alternative substrates. These substrates are treated FEP (fluorinated
ethylene-propylene) sheet, silicone coated paper, and halosilane coated glass plates.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D823 Practices for Producing Films of Uniform Thickness of Paint, Coatings and Related Products on Test Panels
D1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
D1653 Test Methods for Water Vapor Transmission of Organic Coating Films
D2370 Test Method for Tensile Properties of Organic Coatings
D5590 Test Method for Determining the Resistance of Paint Films and Related Coatings to Fungal Defacement by Accelerated
Four-Week Agar Plate Assay
E96/E96M Test Methods for Water Vapor Transmission of Materials
3. Summary of Test Method
3.1 Free films are prepared by depositing a uniform wet coating of the test material on a release substrate. The applied films
are dried or baked, cut into appropriate size for the intended physical property test, and then stripped from the release substrate.
4. Significance and Use
4.1 Free films are required for conducting tests to evaluate physical and mechanical properties such as tensile and elongation
(Test Methods D2370 and E96/E96M), moisture vapor permeability (Test Methods D1653 and E96/E96M), microbiological
activity resistance (Test Method D5590), and other physical properties of organic coatings where the substrate may interfere with
the determination.
5. Apparatus and Materials
5.1 Equipment, for applying films of uniform thickness as described in Practices D823.
5.2 Micrometer Film Thickness Gage, as described in Test Method D1005.
5.3 Alternative Release Substrates:Substrates, any film releasing flat substrate which does not alter film properties and which
allows the casting of coating films with a uniform thickness. Examples of suitable substrates are as follows:
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.23 on Physical Properties of Applied Paint Films.
Current edition approved July 1, 2012March 1, 2019. Published August 2012August 2019. Originally approved in 1987. Last previous edition approved in 20072012 as
D4708 – 07.D4708 – 12. DOI: 10.1520/D4708-12.10.1520/D4708-19.
2
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’sstandard’s Document Summary page on the ASTM website.
*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
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D4708 − 19
,
5.3.1 Sheet of FEP—(polyhexafluoropropylene), preferably 50-μm (2-mils) thick, coated with a thin film of a dry lubricant.).
,
5.3.2 Sheet of Silicone Coated Paper, preferably 125-μm (5-mil) thick.
5.3.3 Glass Plates, coated with halosilane compound.
5.3.4 Steel Panel—wrappedWrapped with Te
...
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