ASTM D4147-18(2023)
(Practice)Standard Practice for Applying Coil Coatings Using Wire-Wound Drawdown Bars
Standard Practice for Applying Coil Coatings Using Wire-Wound Drawdown Bars
SIGNIFICANCE AND USE
3.1 This practice is useful in the laboratory to simulate roll-coated films.
SCOPE
1.1 This practice covers a procedure for applying a coil coating film of uniform thickness on a flat metal panel using wire-wound drawdown bars.
1.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
- Status
- Published
- Publication Date
- 30-Sep-2023
- Technical Committee
- D01 - Paint and Related Coatings, Materials, and Applications
- Drafting Committee
- D01.53 - Coil Coated Metal
Relations
- Effective Date
- 01-Oct-2023
- Effective Date
- 01-Oct-2023
- Effective Date
- 01-Oct-2023
Overview
ASTM D4147-18(2023) - Standard Practice for Applying Coil Coatings Using Wire-Wound Drawdown Bars provides a laboratory procedure for applying uniform coil coating films on flat metal panels. Developed by ASTM International, this method is designed to closely simulate roll-coated films, enabling controlled and repeatable evaluation of coil coating performance and quality. The standard emphasizes producing consistent film thickness using wire-wound drawdown bars, supporting both research and quality control in coil coating applications.
Key Topics
- Uniform Film Application: The standard focuses on procedures for achieving consistent film thickness using wire-wound drawdown bars, which are selected according to the required dry film thickness.
- Panel Securing Methods: It outlines several methods to securely hold test panels, including magnetic chucks, vacuum plates, tape, and mechanical drives, ensuring the panel remains flat during the application process.
- Coating Application Technique: Detailed steps are provided for pouring the coating, positioning the drawdown bar, and maintaining uniform pressure and speed to produce a continuous, even film across the panel.
- Safety and Ventilation: The standard highlights the need for sufficient ventilation due to the low flash points of many solvents used in coil coatings, and advises consulting the Safety Data Sheet (SDS) for further hazard information.
- Film Thickness Control: Choice of drawdown bar, coating solids content, and application speed all influence final wet and dry film thickness, which is crucial for accurate laboratory simulation and evaluation.
Applications
ASTM D4147-18(2023) is widely used in laboratories and quality control environments where precise and reproducible coil coating applications are critical. Key applications include:
- Product Development and Testing: Allows manufacturers to simulate and evaluate roll-applied coil coatings in a controlled laboratory setting, supporting formulation improvements and performance comparisons.
- Quality Assurance: Provides a standardized method for verifying coating thickness and uniformity on metal panels during production, ensuring compliance with industry specifications.
- Process Optimization: Supports the calibration of coil coating equipment by providing benchmark data from laboratory drawdowns.
- Educational and Research Use: Valuable in academic and industrial research for understanding coil coating behavior, film build, and application dynamics.
This practice is essential for anyone working with coil coatings-such as coating manufacturers, metal finishing companies, research laboratories, and quality assurance professionals-who must replicate production-like results in a laboratory environment.
Related Standards
For comprehensive laboratory practices in coatings and surface preparation, the following standards are frequently referenced alongside ASTM D4147-18(2023):
- ASTM D823: Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
- ASTM D7091: Standard Practice for Nondestructive Measurement of Dry Film Thickness of Coatings on Ferrous and Nonferrous Metal Substrates
- ASTM D1005: Standard Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
Using ASTM D4147-18(2023) in conjunction with these related standards helps ensure high-quality, consistent coil coatings and reliable laboratory results for metal finishing and coatings applications.
Keywords: ASTM D4147, coil coatings, drawdown bars, laboratory coating application, uniform film thickness, metal panel coatings, coating quality control, coating thickness measurement.
Frequently Asked Questions
ASTM D4147-18(2023) is a standard published by ASTM International. Its full title is "Standard Practice for Applying Coil Coatings Using Wire-Wound Drawdown Bars". This standard covers: SIGNIFICANCE AND USE 3.1 This practice is useful in the laboratory to simulate roll-coated films. SCOPE 1.1 This practice covers a procedure for applying a coil coating film of uniform thickness on a flat metal panel using wire-wound drawdown bars. 1.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
SIGNIFICANCE AND USE 3.1 This practice is useful in the laboratory to simulate roll-coated films. SCOPE 1.1 This practice covers a procedure for applying a coil coating film of uniform thickness on a flat metal panel using wire-wound drawdown bars. 1.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM D4147-18(2023) is classified under the following ICS (International Classification for Standards) categories: 87.040 - Paints and varnishes. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D4147-18(2023) has the following relationships with other standards: It is inter standard links to ASTM D4147-18, ASTM D3794-22, ASTM D823-18(2022). Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D4147-18(2023) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D4147 − 18 (Reapproved 2023)
Standard Practice for
Applying Coil Coatings Using Wire-Wound Drawdown Bars
This standard is issued under the fixed designation D4147; 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 and the volume solids of the coating under test. Each bar is
provided a numeric identifier to help in selecting the correct bar
1.1 This practice covers a procedure for applying a coil
to provide a specific dry film thickness.
coating film of uniform thickness on a flat metal panel using
wire-wound drawdown bars.
4.2 Devices for Securing Panels:
4.2.1 Magnetic Chuck for securing steel panels to eliminate
1.2 This standard does not purport to address all of the
bowing.
safety concerns, if any, associated with its use. It is the
4.2.2 Vacuum Plate for securing very lightweight nonmag-
responsibility of the user of this standard to establish appro-
netic panels.
priate safety, health, and environmental practices and deter-
4.2.3 Tape for securing the top of thin-gage panels.
mine the applicability of regulatory limitations prior to use.
4.2.4 Mechanical Drives for securing panels and automat-
1.3 This international standard was developed in accor-
ing the drawdown procedure.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Hazards
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5.1 The flash points of most solvents used in coatings and
Barriers to Trade (TBT) Committee.
related products are low enough that adequate ventilation is
needed to avoid exceeding 25 % of the lower explosive limits
2. Summary of Practice
of the solvent when preparing and baking the panels. These
2.1 A flat panel is secured on a firm horizontal surface. An
solvents could be toxic, care should be taken to avoid inhala-
ample amount of coating is poured across one end of the panel
tion of the vapors and unnecessary contact of the solvents with
and the drawdown bar placed behind the coating. The bar is
the skin. Consult the corresponding SDS for the specific
then drawn with uniform pressure and speed along the length
coating to be applied for additional hazards.
of the panel toward the operator to apply a uniform film. The
wet and dry film coating thickness obtained is dependent on the
6. Procedure
combination of the bar used, the volume solids of the coating,
6.1 Deburr panels so edges are smooth. Secure a flat panel
and the speed of the drawdown motion.
to be coated on a firm, uniform, level surface. To provide
sufficient testing surface pour an ample amount of coating
3. Significance and Use
across the top end of the panel. Place the drawdown bar behind
3.1 This practice is useful in the laboratory to simulate
the coating and pull into the coating. Rotate the drawdown bar
roll-coated film
...
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