ASTM D6132-13(2022)
(Test Method)Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Coating Thickness Gage
Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Coating Thickness Gage
SIGNIFICANCE AND USE
5.1 Many coating properties are markedly affected by the film thickness of the dry film such as adhesion, flexibility, wear, durability, chemical resistance, and hardness. To be able to compare results obtained by different operators, it is essential to measure film thickness carefully.
5.2 Most protective and high performance coatings are applied to meet a requirement or a specification for the dry-film thickness of each coat, or for the complete system, or both. Coatings must be applied within certain minimum and maximum thickness tolerances in order that they can fulfill their intended function. In addition to potential performance deficiencies, it is uneconomical to apply more material than necessary when coating large areas such as floors and walls.
5.3 Low readings may occur occasionally on coatings with rough surfaces. The instrument may allow a user adjustment to prevent this.
5.4 This test method may not be applicable to measure organic coating thickness on all substrates. The instrument's ability to detect a distinct interface between the coating and the substrate may be impeded if the coating and the substrate are of similar composition, density or attenuation or if the coating is non-homogeneous. Verify operation on a known thickness of the coating/substrate combination if these circumstances are thought to exist.
5.5 Multilayered coatings have many interfaces and the instrument will measure to the interface separating the two most acoustically different materials. Some instruments have the ability to detect and measure the individual layer thicknesses in a multi-layer system.
5.6 The use of this test method is not necessarily limited by the type of substrate material.
SCOPE
1.1 This test method describes the use of ultrasonic film thickness gages to measure accurately and nondestructively the dry film thickness of organic coatings applied over a substrate of dissimilar material. Measurements may be made on field structures, on commercially manufactured products, or on laboratory test specimens. These types of gages can accurately measure the dry film thickness of organic coatings on a variety of substrates such as concrete, wood, wallboard, plastic, fiber composites and metal.
1.2 This test method is not applicable to coatings that will be readily deformable under load of the measuring instrument as the instrument probe is placed directly on the coating surface to take a reading.
1.3 The effective range of instruments using the principle of ultrasonics is limited by gage design. A thickness range of 8 μm to 7.60 mm (0.3 to 300 mils) has been demonstrated.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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.
1.6 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.
General Information
Relations
Standards Content (Sample)
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: D6132 − 13 (Reapproved 2022)
Standard Test Method for
Nondestructive Measurement of Dry Film Thickness of
Applied Organic Coatings Using an Ultrasonic Coating
1
Thickness Gage
This standard is issued under the fixed designation D6132; 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. Referenced Documents
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2.1 ASTM Standards:
1.1 This test method describes the use of ultrasonic film
D823 Practices for Producing Films of Uniform Thickness
thicknessgagestomeasureaccuratelyandnondestructivelythe
of Paint, Coatings and Related Products on Test Panels
dry film thickness of organic coatings applied over a substrate
D1005 Test Method for Measurement of Dry-Film Thick-
of dissimilar material. Measurements may be made on field
ness of Organic Coatings Using Micrometers
structures, on commercially manufactured products, or on
D4138 Practices for Measurement of Dry Film Thickness of
laboratory test specimens. These types of gages can accurately
Protective Coating Systems by Destructive, Cross-
measure the dry film thickness of organic coatings on a variety
Sectioning Means
of substrates such as concrete, wood, wallboard, plastic, fiber
E177 Practice for Use of the Terms Precision and Bias in
composites and metal.
ASTM Test Methods
1.2 This test method is not applicable to coatings that will
E691 Practice for Conducting an Interlaboratory Study to
be readily deformable under load of the measuring instrument
Determine the Precision of a Test Method
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astheinstrumentprobeisplaceddirectlyonthecoatingsurface
2.2 SSPC—The Society for Protective Coatings Standards:
to take a reading.
PA 2 Procedure for Determining Conformance to Dry Coat-
ing Thickness Requirements
1.3 The effective range of instruments using the principle of
PA 9 Measurement of Dry Organic Coating Thickness on
ultrasonicsislimitedbygagedesign.Athicknessrangeof8µm
Cementitious Substrates Using Ultrasonic Gages
to 7.60 mm (0.3 to 300 mils) has been demonstrated.
2.3 ASME—The American Society of Mechanical Engi-
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1.4 The values stated in SI units are to be regarded as
neers:
standard. No other units of measurement are included in this
B46.1 Surface Texture (Surface Roughness, Waviness, and
standard.
Lay)
1.5 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Definitions of Terms Specific to This Standard:
responsibility of the user of this standard to establish appro-
3.1.1 accuracy, n—the measure of the magnitude of error
priate safety, health, and environmental practices and deter-
between the result of a measurement and the true thickness of
mine the applicability of regulatory limitations prior to use.
the item being measured.
1.6 This international standard was developed in accor-
3.1.1.1 Discussion—An accuracy statement predicts the
dance with internationally recognized principles on standard-
abilityofacoatingthicknessgagetomeasurethetruethickness
ization established in the Decision on Principles for the
of a coating to be measured. Accuracy statements provide the
Development of International Standards, Guides and Recom-
performance capability across the full functional measurement
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
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’s Document Summary page on
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint the ASTM website.
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and Related Coatings, Materials, andApplications and is the direct responsibility of Available from Society for Protective Coatings (SSPC), 800 Trumbull Dr.,
Subcommittee D01.23 on Physical Properties of Applied Paint Films. Pittsburgh, PA 15205, http://www.sspc.org.
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CurrenteditionapprovedJune1,2022.PublishedJuly2022.Originallyapproved Available from American Society of Mechanical Engineers (ASME), ASME
in 1997. Last previously edition approved in 2017 as D6132 – 13 (2017). DOI: International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
10.1520/D6132-13R22. www.asme.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6132 − 13 (2022)
range of the gage. Accurac
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