ASTM D1212-91(2013)
(Test Method)Standard Test Methods for Measurement of Wet Film Thickness of Organic Coatings
Standard Test Methods for Measurement of Wet Film Thickness of Organic Coatings
SIGNIFICANCE AND USE
4.1 Wet film thickness measurements aid in the prediction of dry film thickness. In instances where dry film thickness cannot be measured nondestructively, wet film thickness is frequently specified. Also, the ability to determine wet film thickness during application can provide the opportunity to correct the application procedures.
SCOPE
1.1 These test methods cover the determination of wet film thickness of organic coatings such as paint, varnish, and lacquer. Two methods are described as follows:
1.1.1 In Test Method A, the Wet Film Thickness Gage (English or Metric graduation (see 5.1)) is used to measure wet film thicknesses up to 60 mils on the English scale series, and up to 700 μm on the metric scale series (Sections 5-8).
1.1.2 In Test Method B, the Pfund Gage is used to measure wet film thicknesses up to 14.2 mils (360 μm) (Sections 9-13).
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D1212 − 91 (Reapproved 2013)
Standard Test Methods for
1
Measurement of Wet Film Thickness of Organic Coatings
This standard is issued under the fixed designation D1212; 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 3.3 InTest Method B, a gage with a convex lower surface is
pushed into the wet film until the center touches the substrate.
1.1 These test methods cover the determination of wet film
The diameter of the spot of wet coating left on the convex
thickness of organic coatings such as paint, varnish, and
surface is measured and the film thickness calculated from the
lacquer. Two methods are described as follows:
diameter of the spot and the radius of curvature.
1.1.1 In Test Method A, the Wet Film Thickness Gage
(English or Metric graduation (see 5.1)) is used to measure wet
4. Significance and Use
film thicknesses up to 60 mils on the English scale series, and
4.1 Wet film thickness measurements aid in the prediction
up to 700 µm on the metric scale series (Sections5–8).
of dry film thickness. In instances where dry film thickness
1.1.2 In Test Method B, the Pfund Gage is used to measure
cannot be measured nondestructively, wet film thickness is
wet film thicknesses up to 14.2 mils (360 µm) (Sections9–
frequently specified. Also, the ability to determine wet film
13).
thickness during application can provide the opportunity to
1.2 The values stated in SI units are to be regarded as the
correct the application procedures.
standard. The values given in parentheses are for information
only.
TEST METHOD A
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Apparatus
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.1 WetFilmThicknessGage—Twoversionsofthegageare
3
now in use: The original design as shown in Fig. 1 and a later
bility of regulatory limitations prior to use.
designasshowninFig.2.Bothdesignsconsistsofaneccentric
2. Referenced Documents
center wheel supported by two concentric wheels so as to
2
2.1 ASTM Standards: providetwoscalesthatarebilaterallysymmetrical.Asthegage
D823 Practices for Producing Films of Uniform Thickness is rolled on the film, there is a change in clearance between the
of Paint, Varnish, and Related Products on Test Panels wet film and the eccentric wheel. The point at which the film
first touches the center wheel measures the thickness of the
3. Summary of Test Methods
film.
3.1 The material is applied in the laboratory to plane, rigid
5.2 The later design shown in Fig. 2, moves the eccentric
test panels or in the field to the surface being coated. The wet
wheel from between the concentric wheels, as shown in Fig. 1,
film thickness is determined as quickly as possible to reduce
to the outside of the gage and closer to one of the concentric
shrinkage due to solvent loss.
wheels. Gage reading errors of parallax across the gage are
3.2 In Test Method A, a gage with one eccentric and two eliminatedasthetwoscalesareplaceddirectlyontheeccentric
concentricwheelsisrolledoverthesurfaceandthepointwhere wheel and errors when measuring on uneven support surfaces
the eccentric wheel first touches the wet film is determined. are reduced by placing the eccentric wheel closer to one of the
supporting concentric wheels.
1
These test methods are under the jurisdiction of ASTM Committee D01 on
5.3 Best precision is obtained when using the near linear
Paint and Related Coatings, Materials, and Applications and are the direct
central portion of each scale, constituting about 80 % of its
responsibility of Subcommittee D01.23 on Physical Properties of Applied Paint
Films.
Current edition approved July 1, 2013. Published July 2013. Originally approved
ε1
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in 1952. Last previous edition approved in 2007 as D1212 – 91 (2007) . DOI: Both versions of this gage (Interchemical (INMONT) and Model “C”) are
10.1520/D1212-91R13. covered by U.S. Patents 2 507 592 and 3 128 558 and are issued to Maynard R.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Euverard. Interested parties are invited to submit information regarding the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM identification of acceptable alternatives to this patented item to the Committee on
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the ASTM website. at a meeting of the responsible technical committee, which you may atte
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