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ASTM D3732-23

(Practice)

Standard Practice for Reporting Cure Times of Ultraviolet-Cured Coatings

Standard Practice for Reporting Cure Times of Ultraviolet-Cured Coatings

SIGNIFICANCE AND USE
4.1 This practice provides a guide whereby all pertinent variables relating to the ultraviolet cure of a coating are described.
SCOPE
1.1 This practice applies to all coatings cured by ultraviolet energy.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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-Jun-2023
ICS
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.55 - Factory Applied Coatings on Preformed Products
Current Stage
Ref Project

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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: D3732 − 23
Standard Practice for
1
Reporting Cure Times of Ultraviolet-Cured Coatings
This standard is issued under the fixed designation D3732; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope D3359 Test Methods for Rating Adhesion by Tape Test
D3363 Test Method for Film Hardness by Pencil Test
1.1 This practice applies to all coatings cured by ultraviolet
energy.
3. Terminology
1.2 The values stated in SI units are to be regarded as
3.1 Definitions of Terms Specific to This Standard:
standard. No other units of measurement are included in this
3.1.1 cure, n—the condition of a coating after conversion to
standard.
the final state of cure as measured by tests generally related to
end-use performance and mutually agreeable to supplier and
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the purchaser.
responsibility of the user of this standard to establish appro-
3.1.2 ultraviolet curing, n—conversion of a coating from its
priate safety, health, and environmental practices and deter-
application state to its final use state by means of a mechanism
mine the applicability of regulatory limitations prior to use.
initiated by ultraviolet radiation generated by equipment de-
1.4 This international standard was developed in accor-
signed for that purpose.
dance with internationally recognized principles on standard-
4. Significance and Use
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4.1 This practice provides a guide whereby all pertinent
mendations issued by the World Trade Organization Technical
variables relating to the ultraviolet cure of a coating are
Barriers to Trade (TBT) Committee.
described.
2. Referenced Documents
5. Procedure
2
2.1 ASTM Standards:
5.1 Apply the coating to be cured to the desired substrate at
D968 Test Methods for Abrasion Resistance of Organic
a film thickness typical to that normally used. After approxi-
Coatings by Falling Abrasive
mately the time delay encountered in production pass the
D1474 Test Methods for Indentation Hardness of Organic
coated substrate through the curing equipment and subse-
Coatings
quently test for cure, as defined in 3.1.1, using the appropriate
D2197 Test Method for Adhesion of Organic Coatings by
methods listed in 5.1.1 through 5.1.9. The most commonly
Scrape Adhesion
used test methods are listed in 5.1.1 through 5.1.4.
D2793 Test Method for Block Resistance of Organic Coat-
5.1.1 Impact Resistance—Test Method D2794.
ings on Wood Panel Substrates
5.1.2 Film Hardness—Test Method D3363.
D2794 Test Method for Resistance of Organic Coatings to
5.1.3 Solvent Rub Test—Hold a pad of cheesecloth or other
the Effects of Rapid Deformation (Impact)
cloth saturated with an agreed-upon solvent, usually methyl
D3023 Practice for Determination of Resistance of Factory-
ethyl ketone, over two adjacent fingers using a protective
Applied Coatings on Wood Products to Stains and Re-
covering. Rub the wet pad back and forth across a 100 mm
agents
portion of the cured film using vigorous pressure, one forward
and one backward movement constituting one double rub. Take
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
the end point as the number of double rubs required to soften
Related Coatings, Materials, and Applications and is the direct responsibility of
or penetrate the film. Fully cured films are normally required to
Subcommittee D01.55 on Factory Applied Coatings on Preformed Products.
resist a specified number of rubs and the result of the test is
Current edition approved July 1, 2023. Published July 2023. Originally approved
given as exceeding the limit or failing the test.
in 1978. Last previous edition approved in 2017 as D3732 – 82 (2017). DOI:
10.1520/D3732-23.
5.1.4 Sandability—Ultraviolet cured fillers are usually
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
judged by their sandability with an agreed-upon grit of paper.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
This test is often made immediately after the material leaves
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the ultraviolet processor.
Copyright © ASTM International, 100 Barr H
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D3732 − 82 (Reapproved 2017) D3732 − 23
Standard Practice for
1
Reporting Cure Times of Ultraviolet-Cured Coatings
This standard is issued under the fixed designation D3732; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This practice applies to all coatings cured by ultraviolet energy.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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 healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
3
D658 Test Method for Abrasion Resistance of Organic Coatings by Air Blast Abrasive (Withdrawn 1996)
D968 Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive
D1474 Test Methods for Indentation Hardness of Organic Coatings
D2197 Test Method for Adhesion of Organic Coatings by Scrape Adhesion
3
D2336 Guide for Specifying Factory Applied Wood Coatings (Withdrawn 2008)
D2793 Test Method for Block Resistance of Organic Coatings on Wood Panel Substrates
D2794 Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)
D3023 Practice for Determination of Resistance of Factory-Applied Coatings on Wood Products to Stains and Reagents
3
D3281 Test Method for Formability of Attached Organic Coatings with Impact-Wedge Bend Apparatus (Withdrawn 1995)
D3359 Test Methods for Rating Adhesion by Tape Test
D3363 Test Method for Film Hardness by Pencil Test
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 cure, n—the condition of a coating after conversion to the final state of cure as measured by tests generally related to end-use
performance and mutually agreeable to supplier and purchaser.
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.55 on Factory Applied Coatings on Preformed Products.
Current edition approved June 1, 2017July 1, 2023. Published June 2017July 2023. Originally approved in 1978. Last previous edition approved in 20112017 as
D3732 – 82 (2011).(2017). DOI: 10.1520/D3732-82R17.10.1520/D3732-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3732 − 23
3.1.2 ultraviolet curing, n—conversion of a coating from its application state to its final use state by means of a mechanism
initiated by ultraviolet radiation generated by equipment designed for that purpose.
4. Significance and Use
4.1 This practice provides a guide whereby all pertinent variables relating to the ultraviolet cure of a coating are described.
5. Procedure
5.1 Apply the coating to be cured to the desired substrate at a film thickness typical to that normally used. After approximately
the time delay encountered in production pass the coated substrate through the curing equipment and subsequently test for cure,
as defined in 3.1.1, using the appropriate methods listed in 5.1.1 through 5.1.115.1.9. The most commonly used test methods are
listed in 5.1.1 through 5.1.4.
5.1.1 Impact Resistance—Test Method D2794.
5.1.2 Film Hardness—Test Method D3363.
5.1.3 Solvent Rub Test—Hold a pad of cheesecloth or other cloth saturated with an agreed-upon solvent, usually methyl ethyl
ketone, over two adjacent fingers u
...

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