ASTM D6132-97

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Designation: D 6132 – 97
Standard Test Method for
Nondestructive Measurement of Dry Film Thickness of
Applied Organic Coatings Over Concrete Using an
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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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope E 691 Practice for Conducting an Interlaboratory Study to
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Determine the Precision of a Test Method
1.1 This test method covers the use of ultrasonic film
2.2 Steel Structures Painting Council Standard:
thickness gages to measure accurately and nondestructively the
SSPC-PA2 Measurement of Dry Paint Thickness with Mag-
dry film thickness of organic coatings applied over a substrate
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netic Gages
of dissimilar material. Measurements may be made on field
structures, on commercially manufactured products, or on
3. Summary of Test Method
laboratory test specimens. These types of gages can accurately
3.1 Instruments complying with this test method measure
measure the dry film thickness of organic coating on concrete
thickness by emitting an ultrasonic pulse into the coating that
substrates. This test method should be proven for other
is reflected back from the substrate to the probe. The travel
substrates such as wood, hardboard, plastic, and glass prior to
time is converted into a thickness reading. The instrument must
specifying this procedure for use.
be placed directly on the coating surface to take a reading.
1.2 This test method is not applicable to coatings that will
3.2 After verifying the calibration on a known coated part of
be readily deformable under load of the measuring instrument
the object or material of the same kind, the instrument probe is
as the instrument probe is placed directly on the coating surface
coupled with the coated specimen, after proper cure and
to take a reading.
conditioning according to the coating manufacturer’s instruc-
1.3 The effective range of instruments using the principle of
tions.
ultrasonics is limited by gage design. A thickness range of 0.5
3.3 It should be recognized that the accuracy of the mea-
to 275 mils (10 μm to 7 mm) has been demonstrated.
surements can be influenced when:
1.4 The values stated in inch-pounds are to be regarded as
3.3.1 The coated object to be measured is not planar with
the standard. The SI values given in parentheses are provided
respect to the transducer face at the point of measurment,
for information only.
3.3.2 The surface roughness of the coated specimen exceeds
1.5 This standard does not purport to address the safety
the coating thickness, and
concerns, if any, associated with its use. It is the responsibility
3.3.3 Coating density is not uniform.
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
4. Significance and Use
limitations prior to use.
4.1 Many coating properties are markedly affected by the
2. Referenced Documents film thickness of the dry film such as adhesion, flexibility, and
hardness. To be able to compare results obtained by different
2.1 ASTM Standards:
operators, it is essential to measure film thickness closely.
D 823 Practices for Producing Films of Uniform Thickness
2 4.2 Most protective and high performance coatings are
of Paint, Varnish, and Related Products on Test Panels
applied to meet a requirement or a specification for the dry-film
D 1005 Test Method for Measurement of Dry-Film Thick-
2 thickness of each coat, or for the complete system, or both.
ness of Organic Coatings Using Micrometers
Coatings must be applied within certain minimum and maxi-
D 4138 Test Method for Measurement of Dry Film Thick-
3 mum thickness tolerances in order that they can fulfill their
ness of Protective Coating Systems by Destructive Means
intended function. In addition to potential performance de-
iciencies, it is uneconomical to apply more material than
necessary when coating large areas such as floors and walls.
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This test method is under the jurisdiction of ASTM Committee D-1 on Paint
and Related Coatings, Materials, and Applications, and is the direct responsibility of
Subcommittee D01.23 on Physical Properties of Applied Paint Films.
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Current edition approved July 10, 1997. Published September 1997. Annual Book of ASTM Standards, Vol 14.02.
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Annual Book of ASTM Standards, Vol 06.01. Available from Steel Structures Painting Council, Post Office Box 641256,
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Annual Book of ASTM Standards, Vol 06.02. Pittsburgh, PA 15264–1256.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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