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ASTM D1400-94

(Test Method)

Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Nonconductive Coatings Applied to a Nonferrous Metal Base

Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Nonconductive Coatings Applied to a Nonferrous Metal Base

SCOPE
1.1 This test method covers the nondestructive measurement of the dry film thickness of electrically nonconductive coatings applied over a nonferrous metal base using commercially available eddy current instruments. This test method is intended to supplement manufacturers' instructions for the manual operation of the gages, and is not intended to replace them.
1.2 This test method is not applicable to coatings that will be readily deformable under the load of the measuring instruments, as the instrument probe must be placed directly on the coating surface to take a reading.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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 limitations prior to use.

General Information

Status
Historical
Publication Date
09-Nov-2000
ICS
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.23 - Physical Properties of Applied Paint Films
Current Stage
Ref Project

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ASTM D1400-94 - Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Nonconductive Coatings Applied to a Nonferrous Metal BaseASTM D1400-94 - Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Nonconductive Coatings Applied to a Nonferrous Metal Base
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ASTM D1400-94 - Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Nonconductive Coatings Applied to a Nonferrous Metal Base
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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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: D 1400 – 94
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Nondestructive Measurement of Dry Film Thickness of
Nonconductive Coatings Applied to a Nonferrous Metal
1
Base
This standard is issued under the fixed designation D 1400; 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 3.2 It should be recognized that the accuracy of the mea-
surements can be influenced or affected when measurements
1.1 This test method covers the nondestructive measure-
are made closer than 1 in. (25 mm) to an edge or 3 in. (75 mm)
ment of the dry film thickness of electrically nonconductive
to another mass of metal.
coatings applied over a nonferrous metal base using commer-
cially available eddy current instruments.
4. Significance and Use
1.2 This test method is not applicable to coatings that are
4.1 The results of many test methods applicable to coatings
readily deformable under the load of the measuring instru-
are markedly affected by the film thickness of the dry film,
ments, as the instrument probe must be placed directly on the
some examples being adhesion, flexibility, and hardness to
coating surface to take a reading.
name a few. To be able to compare results obtained by different
1.3 This standard does not purport to address all of the
operators, it is essential to measure film thickness closely.
safety concerns, if any, associated with its use. It is the
4.2 Most protective and high performance coatings are
responsibility of the user of this standard to establish appro-
applied to meet a requirement or a specification for the dry film
priate safety and health practices and determine the applica-
thickness of each coat, or for the complete system, or both.
bility of regulatory limitations prior to use.
Coatings must be applied within certain minimum and maxi-
2. Referenced Documents mum thickness tolerances in order that they can fulfill their
intended function. In addition to potential performance defi-
2.1 ASTM Standards:
ciencies, it is uneconomical to apply more material than
D 823 Practices for Producing Films of Uniform Thickness
2
necessary when coating large areas such as metal structures
of Paint, Varnish, and Related Products on Test Panels
and coils. This test method is used to measure film thickness of
D 1005 Test Method for Measurement of Dry-Film Thick-
2
coatings on nonferrous metals.
ness of Organic Coatings Using Micrometers
D 1730 Practices for Preparation of Aluminum and
5. Apparatus
3
Aluminum-Alloy Surfaces for Painting
5.1 Eddy Current Thickness Gages, commercially available,
D 3980 Practice for Interlaboratory Testing of Paint and
4
2
suitable to measure coating thickness accurately.
Related Materials
5.2 Nonconductive Thickness Shims for Calibration—
3. Summary of Test Method Shims with assigned values traceable to National Standards are
available, but when shims are used that are not traceable to
3.1 After calibrating the instrument using shims of known
National Standards, thickness must be measured to the nearest
thickness and either a bare part of the metal object or metal of
0.1 mil (2.5 μm) using a micrometer using a method such as
the same kind, the instrument probe is placed in contact with
Procedure D in Test Method D 1005.
the coated metal. In instruments of this type, electrical char-
acteristics of a coil and the probe are changed by the eddy
6. Test Specimens
currents created in substrates by the alternating flux of the coil.
6.1 When this test method is used in the field, the specimen
The extent of such changes varies with the distance between
is the coated structure or article on which the thickness is to be
the probe and the metal, the distance being the thickness of the
evaluated.
dry coating film.
6.2 For laboratory use apply the materials to be tested to
panels of the composition and surface conditions on which it is
1
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
desired to determine the thickness.
and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.23 on Physical Properties of Applied Paint Films.
NOTE 1—Applicable test panel description and surface preparation
Current edition approved Aug. 15, 1994. Published October 1994. Originally
published as D 1400 – 56. Last previous edition D 1400 – 87.
2 4
Annual Book of ASTM Standards, Vol 06.01. Apparatus found to be typical are shown in Table 1. Sources for the instruments
3
Annual Book of ASTM Standar
...

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