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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
ICS
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.53 - Coil Coated Metal
Current Stage
Ref Project

Relations

Replaces
ASTM D4147-18 - Standard Practice for Applying Coil Coatings Using Wire-Wound Drawdown Bars
Effective Date
01-Oct-2023
Referred By
ASTM D3794-22 - Standard Guide for Testing Coil Coatings
Effective Date
01-Oct-2023
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-Oct-2023

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ASTM D4147-18(2023) - Standard Practice for Applying Coil Coatings Using Wire-Wound Drawdown BarsASTM D4147-18(2023) - Standard Practice for Applying Coil Coatings Using Wire-Wound Drawdown Bars
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ASTM D4147-18(2023) - Standard Practice for Applying Coil Coatings Using Wire-Wound Drawdown Bars
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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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5.1 Coatings attached to substrates are subjected to damaging impacts during the manufacture of articles and their use in service. In its use over many years, this test method for impact resistance has been found to be useful in predicting the performance of organic coatings for their ability to resist cracking caused by impacts.
SCOPE
1.1 This test method covers a procedure for rapidly deforming by impact a coating film and its substrate and for evaluating the effect of such deformation.  
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