ASTM D6132-08

Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Gage

SIGNIFICANCE AND USE
p>Many coating properties are markedly affected by the film thickness of the dry film such as adhesion, flexibility, and hardness. To be able to compare results obtained by different operators, it is essential to measure film thickness carefully.
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.
Surface roughness can affect the accuracy of this test method. A rough surface has a tendency to scatter the ultrasonic pulse and odd readings may occur occasionally.
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 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.
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.
The use of this test method is not necessarily limited by the type of substrate material as nondestructive magnetic-type or eddy current means.
SCOPE
1.1 This test method covers 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 concrete, wood and wallboard substrates.
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 0.3 to 600 mils (8 μm to 15 mm) 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 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.

General Information

• Status: Historical
• Publication Date: 30-Jun-2008
• ICS: 25.220.60 - Organic coatings
• ICS: 71.040.50 - Physicochemical methods of analysis
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.23 - Physical Properties of Applied Paint Films

Relations

• Replaces: ASTM D6132-04 - Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Gage
• Effective Date: 01-Jul-2008
• Replaced By: ASTM D6132-13 - Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Coating Thickness Gage
• Effective Date: 01-Nov-2013
• Referred By: ASTM D5590-17(2021) - Standard Test Method for Determining the Resistance of Paint Films and Related Coatings to Fungal Defacement by Accelerated Four-Week Agar Plate Assay
• Effective Date: 01-Jul-2008
• Referred By: ASTM C722-18(2023) - Standard Specification for Chemical-Resistant Monolithic Floor Surfacings
• Effective Date: 01-Jul-2008
• Referred By: ASTM D6577-15(2019) - Standard Guide for Testing Industrial Protective Coatings
• Effective Date: 01-Jul-2008
• Referred By: ASTM D6237-19 - Standard Guide for Painting Inspectors (Concrete and Masonry Substrates)
• Effective Date: 01-Jul-2008
• Referred By: ASTM D1006/D1006M-21 - Standard Practice for Conducting Exterior Exposure Tests of Hand and Factory Applied Paints on Wood and Wood Composite Materials
• Effective Date: 01-Jul-2008
• Referred By: ASTM D6943-15(2019) - Standard Practice for Immersion Testing of Industrial Protective Coatings and Linings
• Effective Date: 01-Jul-2008
• Referred By: ASTM D7835/D7835M-19 - Standard Test Method for Determining the Solvent Resistance of an Organic Coating Using a Mechanical Rubbing Machine
• Effective Date: 01-Jul-2008
• Referred By: ASTM D3451-06(2017) - Standard Guide for Testing Coating Powders and Powder Coatings
• Effective Date: 01-Jul-2008
• Referred By: ASTM D5498-12a(2018) - Standard Guide for Developing a Training Program for Personnel Performing Coating and Lining Work Inspection for Nuclear Facilities
• Effective Date: 01-Jul-2008
• Referred By: ASTM D6944-15(2020) - Standard Practice for Determining the Resistance of Cured Coatings to Thermal Cycling
• Effective Date: 01-Jul-2008
• Referred By: ASTM D3456-18 - Standard Practice for Determining by Exterior Exposure Tests the Susceptibility of Paint Films to Microbiological Attack
• Effective Date: 01-Jul-2008
• Referred By: ASTM D5064-16a(2021) - Standard Practice for Conducting a Patch Test to Assess Coating Compatibility
• Effective Date: 01-Jul-2008
• Referred By: ASTM F3078-15 - Standard Test Method for Identification and Quantification of Lead in Paint and Similar Coating Materials using Energy Dispersive X-ray Fluorescence Spectrometry (EDXRF)
• Effective Date: 01-Jul-2008

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D6132 − 08
Standard Test Method for
Nondestructive Measurement of Dry Film Thickness of
1
Applied Organic Coatings Using an Ultrasonic 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* D4138 Practices for Measurement of Dry Film Thickness of
Protective Coating Systems by Destructive, Cross-
1.1 This test method covers the use of ultrasonic film
Sectioning Means
thicknessgagestomeasureaccuratelyandnondestructivelythe
E177 Practice for Use of the Terms Precision and Bias in
dry film thickness of organic coatings applied over a substrate
ASTM Test Methods
of dissimilar material. Measurements may be made on field
E691 Practice for Conducting an Interlaboratory Study to
structures, on commercially manufactured products, or on
Determine the Precision of a Test Method
laboratory test specimens. These types of gages can accurately
3
measure the dry film thickness of organic coatings on concrete, 2.2 SSPC—The Society for Protective Coatings Standards:
wood and wallboard substrates. SSPC-PA2 Measurement of Dry Coating Thickness with
Magnetic Gages
1.2 This test method is not applicable to coatings that will
SSPC-PA9 Measurement of Dry Organic Coating Thickness
be readily deformable under load of the measuring instrument
on Cementitious Substrates Using Ultrasonic Gages
astheinstrumentprobeisplaceddirectlyonthecoatingsurface
to take a reading.
3. Summary of Test Method
1.3 The effective range of instruments using the principle of
3.1 Instruments complying with this test method measure
ultrasonics is limited by gage design. A thickness range of 0.3
thickness by emitting an ultrasonic pulse into the coating that
to 600 mils (8 µm to 15 mm) has been demonstrated.
is reflected back from the substrate to the probe. The travel
1.4 The values stated in SI units are to be regarded as
timeisconvertedintoathicknessreading.Theinstrumentmust
standard. No other units of measurement are included in this
be placed directly on the coating surface to take a reading.
standard.
3.2 After verifying accuracy on a known coated part of the
1.5 This standard does not purport to address the safety
object or material of the same kind, the instrument probe is
concerns, if any, associated with its use. It is the responsibility
coupled with the coated specimen, after proper cure and
of the user of this standard to establish appropriate safety and
conditioning according to the coating manufacturer’s instruc-
health practices and determine the applicability of regulatory
tions.
limitations prior to use.
3.3 It should be recognized that the accuracy of the mea-
surements can be influenced when:
2. Referenced Documents
3.3.1 The coated object to be measured is not planar with
2
2.1 ASTM Standards:
respect to the transducer face at the point of measurement,
D823 Practices for Producing Films of Uniform Thickness
3.3.2 Thesurfaceroughnessofthecoatedspecimenexceeds
of Paint, Varnish, and Related Products on Test Panels
the coating thickness, and
D1005 Test Method for Measurement of Dry-Film Thick-
3.3.3 Coating density is not uniform.
ness of Organic Coatings Using Micrometers
4. Significance and Use
1
4.1 Many coating properties are markedly affected by the
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
film thickness of the dry film such as adhesion, flexibility, and
Subcommittee D01.23 on Physical Properties of Applied Paint Films.
hardness. To be able to compare results obtained by different
Current edition approved July 1, 2008. Published July 2008. Originally approved
operators, it is essential to measure film thickness carefully.
in 1997. Last previously edition approved in 2004 as D6132 – 04. DOI: 10.1520/
D6132-08.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,
the ASTM website. Pittsburgh, PA 15222-4656, http://www.sspc.org.
*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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D6132 − 08
4.2 Most protective and high performance coatings are 7.3 Best calibration adjustment results are achieved on
appliedtomeeta
...

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:D6132–04 Designation:D6132–08
Standard Test Method for
Nondestructive Measurement of Dry Film Thickness of
1
Applied Organic Coatings Using an Ultrasonic Gage
This standard is issued under the fixed designation D 6132; 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 test method covers 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 concrete, wood and wallboard substrates.
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 0.3 to
600 mils (8 µm to 15 mm) has been demonstrated.
1.4The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D 823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
D 1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
D 4138Test Method Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive,
Cross-Sectioning Means
E 177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E 691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
2.2 SSPC The Society for Protective Coatings Standard:
3
2.2 SSPC—The Society for Protective Coatings Standards:
SSPC-PA2 Measurement of Dry Coating Thickness with Magnetic Gages
SSPC-PA9 Measurement of Dry Organic Coating Thickness on Cementitious Substrates Using Ultrasonic Gages
3. Summary of Test Method
3.1 Instruments complying with this test method measure thickness by emitting an ultrasonic pulse into the coating that is
reflected back from the substrate to the probe.The travel time is converted into a thickness reading.The instrument must be placed
directly on the coating surface to take a reading.
3.2 After verifying accuracy on a known coated part of the object or material of the same kind, the instrument probe is coupled
with the coated specimen, after proper cure and conditioning according to the coating manufacturer’s instructions.
3.3 It should be recognized that the accuracy of the measurements can be influenced when:
3.3.1 The coated object to be measured is not planar with respect to the transducer face at the point of measurement,
3.3.2 The surface roughness of the coated specimen exceeds the coating thickness, and
1
This test method 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 JuneJuly 1, 2004.2008. Published June 2004.July 2008. Originally approved in 1997. Last previously edition approved in 19972004 as
D6132–97.D 6132 – 04.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from SSPC: The Society for Protective Coatings, 40 24th Street, 6th Floor, Pittsburgh PA 15222-4656.
3
Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor, Pittsburgh, PA 15222-4656, http://www.sspc.org.
*A Summary of Changes section appears at the e
...