ASTM D1212-91(2007)

Standard Test Methods for Measurement of Wet Film Thickness of Organic Coatings

SIGNIFICANCE AND USE
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 m 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.
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: 31-May-2007
• ICS: 25.220.60 - Organic coatings
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.23 - Physical Properties of Applied Paint Films

Relations

• Replaces: ASTM D1212-91(2001) - Standard Test Methods for Measurement of Wet Film Thickness of Organic Coatings
• Effective Date: 01-Jun-2007
• Replaced By: ASTM D1212-91(2007)e1 - Standard Test Methods for Measurement of Wet Film Thickness of Organic Coatings
• Effective Date: 01-Jun-2007
• Referred By: ASTM E1795-20a - Standard Specification for Non-Reinforced Liquid Coating Encapsulation Products for Leaded Paint in Buildings
• Effective Date: 01-Jun-2007
• Referred By: ASTM D6669-19 - Standard Practice for Selecting and Constructing Exposure Scenarios for Assessment of Exposures to Alkyd and Latex Interior Paints
• Effective Date: 01-Jun-2007
• Referred By: ASTM D4414-95(2020) - Standard Practice for Measurement of Wet Film Thickness by Notch Gages
• Effective Date: 01-Jun-2007
• Referred By: ASTM D3794-22 - Standard Guide for Testing Coil Coatings
• Effective Date: 01-Jun-2007
• Referred By: ASTM D7538-09(2018) - Standard Practice for Evaluating the Water Wash-Off Resistance of Traffic Paints Using an Atomizing Spray Device
• Effective Date: 01-Jun-2007
• Referred By: ASTM D7377-09(2018) - Standard Practice for Evaluating the Water Wash-Off Resistance of Traffic Paints using a Water Faucet
• Effective Date: 01-Jun-2007
• Referred By: ASTM D1014-18 - Standard Practice for Conducting Exterior Exposure Tests of Paints and Coatings on Metal Substrates
• Effective Date: 01-Jun-2007
• Referred By: ASTM E1796-20 - Standard Guide for Selection and Use of Liquid Coating Encapsulation Products for Leaded Paint in Buildings
• Effective Date: 01-Jun-2007
• Referred By: ASTM D823-18(2022) - Standard Practices for Producing Films of Uniform Thickness of Paint, Coatings and Related Products on Test Panels
• Effective Date: 01-Jun-2007
• Referred By: ASTM E1797-12(2017)e1 - Standard Specification for Reinforced Liquid Coating Encapsulation Products for Leaded Paint in Buildings
• Effective Date: 01-Jun-2007
• Referred By: ASTM D3730-17(2022) - Standard Guide for Testing High-Performance Interior Architectural Wall Coatings
• Effective Date: 01-Jun-2007
• Referred By: ASTM D711-23 - Standard Test Method for No-Pick-Up Time of Pavement Markings
• Effective Date: 01-Jun-2007
• Referred By: ASTM D6237-19 - Standard Guide for Painting Inspectors (Concrete and Masonry Substrates)
• Effective Date: 01-Jun-2007

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:D1212–91(Reapproved2007)
Standard Test Methods for
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 (Sections 5-8).
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) (Sections 9-13).
frequently specified. Also, the ability to determine wet film
1.2 The values stated in SI units are to be regarded as the
thickness during application can provide the opportunity to
standard. The values given in parentheses are for information
correct the application procedures.
only.
1.3 This standard does not purport to address all of the
TEST METHOD A
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Apparatus
priate safety and health practices and determine the applica-
5.1 WetFilmThicknessGage—Twoversionsofthegageare
bility of regulatory limitations prior to use. 3
now in use: The original design as shown in Fig. 1 and a later
designasshowninFig.2.Bothdesignsconsistsofaneccentric
2. Referenced Documents
center wheel supported by two concentric wheels so as to
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.
5.3 Best precision is obtained when using the near linear
These test methods are under the jurisdiction of ASTM Committee D01 on
central portion of each scale, constituting about 80 % of its
Paint and Related Coatings, Materials, and Applications and are the direct
responsibility of Subcommittee D01.23 on Physical Properties of Applied Paint
total range as shown in the diagram in Fig. 1 and Fig. 2.
Films.
Current edition approved June 1, 2007. Published June 2007. Originally
approved in 1952. Last previous edition approved in 2001 as D1212 - 91 (2001). Both versions of this gage (Interchemical (INMONT) and Model “C”), are
DOI: 10.1520/D1212-91R07. covered by U.S. Patents 2 507 592 and 3 128 558, and are issued to Maynard R.
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 [e-mail]. For Annual Book of ASTM
identification of acceptable alternatives to this patented item to the Committee on
Standards volume information, refer to the standard’s Document Summary page on Standards, ASTM Headquarters. Your comments will receive careful consideration
the ASTM website. at a meeting of the responsible technical committee, which you may attend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D1212–91 (2007)
FIG. 1 Interchemical Wet Film Thickness Gages
FIG. 2 Model “C” Wet Film Thickness Gages
Therefore, the range of the particular gage selected for use during the film thickness measurements. Place the gage on the
should be such that the measured film thickness falls within, wet film so that the minimum marking is at the top and the
and preferably toward the center of the middle 80 % of each greatest clearance between the eccentric wheel and the film is
scale. Gages are available covering the following ranges in directly over the wet film. Roll the gage over the film one-half
mils and microns: revolution in one direction toward the minimum marking on
the gage and repeat in the opposite direction. Read the points
Smallest
Range, mils
Graduation, mils
at which the coating first makes contact with the eccentric
0to2 0.1
wheel and determine the mean which is considered as one
0to4 0.2
2to12 0.5 reading.
10 to 30 1.0
6.3 If the coating contains a solvent that evaporates rapidly
20 to 60 2.0
or if the solids content is low, make at least a second separate
Smallest
Range, µm
reading on a freshly applied film and calculate the mean of the
Graduation, µm
0to40 2.0
separate readings.
0 to 100 5.00
50 to 250 10.00
7. Report
200 to 700 25.00
7.1 Report the mean of the separate readings and the range
6. Procedure
and smallest graduation of the gage used.
6.1 ApplythematerialinaccordancewithPracticesD823to
8. Precision
suitable plane rigid panels of area sufficiently large to permit
8.1 In an interlaboratory study of this test method, in which
film thickness measurements at least 25 mm (1 in.) from any
two operators in at least six laboratories made measurements
edge. Determine the film thickness immediately after applica-
tion.
6.2 Support the test panels on a suitable level base in such
Supporting data have been filed at ASTM International Headquarters and may
a way that there will be no movement or spring of the panels be obtained by requesting Research Report RR: D01-1023.
D1212–91 (2007)
TEST
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