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ASTM D2794-93(2019)

(Test Method)

Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)

Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)

SIGNIFICANCE AND USE
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.  
1.2 This test method should be restricted to testing in only one laboratory when numerical values are used because of the poor reproducibility of the method. Interlaboratory agreement is improved when ranking is used in place of numerical values.  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.4 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.  
1.5 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
Historical
Publication Date
31-Dec-2018
ICS
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.23 - Physical Properties of Applied Paint Films
Current Stage
Ref Project

Relations

Refers
ASTM D823-17 - Standard Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
Effective Date
01-Dec-2017
Refers
ASTM D823-95(2012) - Standard Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
Effective Date
01-Nov-2012
Refers
ASTM D609-00(2012) - Standard Practice for Preparation of Cold-Rolled Steel Panels for Testing Paint, Varnish, Conversion Coatings, and Related Coating Products
Effective Date
01-Jun-2012
Refers
ASTM D823-95(2007) - Standard Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
Effective Date
01-Jun-2007
Refers
ASTM D609-00(2006) - Standard Practice for Preparation of Cold-Rolled Steel Panels for Testing Paint, Varnish, Conversion Coatings, and Related Coating Products
Effective Date
01-Nov-2006
Refers
ASTM D823-95 - Standard Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
Effective Date
01-Jan-2001
Refers
ASTM D823-95(2001) - Standard Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
Effective Date
01-Jan-2001
Refers
ASTM D609-00 - Standard Practice for Preparation of Cold-Rolled Steel Panels for Testing Paint, Varnish, Conversion Coatings, and Related Coating Products
Effective Date
10-Apr-2000

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ASTM D2794-93(2019) - Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)ASTM D2794-93(2019) - Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)
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ASTM D2794-93(2019) - Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)
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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: D2794 − 93 (Reapproved 2019)
Standard Test Method for
Resistance of Organic Coatings to the Effects of Rapid
1
Deformation (Impact)
This standard is issued under the fixed designation D2794; 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 of Paint, Coatings and Related Products on Test Panels
D1186 Test Methods for Nondestructive Measurement of
1.1 This test method covers a procedure for rapidly deform-
Dry Film Thickness of Nonmagnetic Coatings Applied to
ingbyimpactacoatingfilmanditssubstrateandforevaluating
3
a Ferrous Base (Withdrawn 2006)
the effect of such deformation.
1.2 This test method should be restricted to testing in only 3. Terminology
one laboratory when numerical values are used because of the
3.1 Definitions of Terms Specific to This Standard:
poor reproducibility of the method. Interlaboratory agreement
3.1.1 impact resistance, of a coating, n—the number of
is improved when ranking is used in place of numerical values.
inch-pounds (kilogram-metres) required to produce cracking in
1.3 The values stated in inch-pound units are to be regarded the deformed coating.
as standard. The values given in parentheses are mathematical
4. Summary of Test Method
conversions to SI units that are provided for information only
and are not considered standard.
4.1 The organic coatings under test are applied to suitable
thin metal panels. After the coatings have cured, a standard
1.4 This standard does not purport to address all of the
weight is dropped a distance so as to strike an indenter that
safety concerns, if any, associated with its use. It is the
deforms the coating and the substrate. The indentation can be
responsibility of the user of this standard to establish appro-
either an intrusion or an extrusion. By gradually increasing the
priate safety, health, and environmental practices and deter-
distance the weight drops, the point at which failure usually
mine the applicability of regulatory limitations prior to use.
occurs can be determined. Films generally fail by cracking,
1.5 This international standard was developed in accor-
which is made more visible by the use of a magnifier, by the
dance with internationally recognized principles on standard-
application of a copper sulfate (CuSO ) solution on steel, or by
ization established in the Decision on Principles for the
4
the use of a pin hole detector.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5. Significance and Use
Barriers to Trade (TBT) Committee.
5.1 Coatings attached to substrates are subjected to damag-
2. Referenced Documents
ing impacts during the manufacture of articles and their use in
2 service. In its use over many years, this test method for impact
2.1 ASTM Standards:
resistance has been found to be useful in predicting the
D609 Practice for Preparation of Cold-Rolled Steel Panels
performance of organic coatings for their ability to resist
for Testing Paint, Varnish, Conversion Coatings, and
cracking caused by impacts.
Related Coating Products
D823 Practices for Producing Films of Uniform Thickness
6. Apparatus
6.1 Tester, consisting of a vertical tube to guide a cylindrical
1 weight that is dropped on a punch resting on the test panel.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of 6.1.1 Guide Tube, 24 to 48 in. (0.6 to 1.2 m) long mounted
Subcommittee D01.23 on Physical Properties of Applied Paint Films.
vertically in a base plate. A slot is cut lengthwise on one side
Current edition approved Jan. 1, 2019. Published January 2019. Originally
of the tube to act as a guide for a cylindrical weight that fits
approved in 1969. Last previous edition approved in 2010 as D2794 – 93 (2010).
inside the tube. Graduations are marked in inch-pounds along
DOI: 10.1520/D2794-93R19.
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
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1
...

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