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ASTM D522/D522M-17(2021)

(Test Method)

Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings

Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings

SIGNIFICANCE AND USE
4.1 Coatings attached to substrates are elongated when the substrates are dimensionally unstable, or are bent during the manufacture of articles or when the articles are abused in service. These test methods have been useful in rating attached coatings for their ability to resist cracking when elongated. They have been useful in evaluating the flexibility of coatings on flexible substrates. The elongation of coating films may also be tested using Test Method D2370. The correlation between elongation determined in accordance with Test Methods D522/D522M and D2370 is unknown.
SCOPE
1.1 These test methods cover the determination of the resistance to cracking (flexibility) of attached organic coatings on substrates of sheet metal or rubber-type materials.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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
31-Oct-2021
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
Current Stage
Ref Project

Relations

Refers
ASTM D1005-95(2020) - Standard Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
Effective Date
01-Jun-2020

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ASTM D522/D522M-17(2021) - Standard Test Methods for Mandrel Bend Test of Attached Organic CoatingsASTM D522/D522M-17(2021) - Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings
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ASTM D522/D522M-17(2021) - Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings
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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: D522/D522M −17 (Reapproved 2021)
Standard Test Methods for
1
Mandrel Bend Test of Attached Organic Coatings
This standard is issued under the fixed designation D522/D522M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber 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 Film Thickness of Nonmagnetic Coatings Applied to
Ferrous Metals and Nonmagnetic, Nonconductive Coat-
1.1 These test methods cover the determination of the
ings Applied to Non-Ferrous Metals
resistance to cracking (flexibility) of attached organic coatings
on substrates of sheet metal or rubber-type materials.
3. Summary of Test Method
1.2 The values stated in either SI units or inch-pound units
3.1 The coating materials under test are applied at uniform
are to be regarded separately as standard. The values stated in
thickness to panels of sheet metal or rubber-type materials.
each system are not necessarily exact equivalents; therefore, to
After drying or curing the coated panels are bent over a
ensure conformance with the standard, each system shall be
mandrel and the resistance to cracking of the coating is
used independently of the other, and values from the two
determined. In Test Method A the coated panels are bent over
systems shall not be combined.
aconicalmandrel.InTestMethodBthecoatedpanelsarebent
1.3 This standard does not purport to address all of the
over cylindrical mandrels of various diameters.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Significance and Use
priate safety, health, and environmental practices and deter-
4.1 Coatings attached to substrates are elongated when the
mine the applicability of regulatory limitations prior to use.
substrates are dimensionally unstable, or are bent during the
1.4 This international standard was developed in accor-
manufacture of articles or when the articles are abused in
dance with internationally recognized principles on standard-
service.These test methods have been useful in rating attached
ization established in the Decision on Principles for the
coatings for their ability to resist cracking when elongated.
Development of International Standards, Guides and Recom-
They have been useful in evaluating the flexibility of coatings
mendations issued by the World Trade Organization Technical
onflexiblesubstrates.Theelongationofcoatingfilmsmayalso
Barriers to Trade (TBT) Committee.
be tested using Test Method D2370. The correlation between
elongation determined in accordance withTest Methods D522/
2. Referenced Documents
D522M and D2370 is unknown.
2
2.1 ASTM Standards:
D823Practices for Producing Films of Uniform Thickness
5. Test Specimen
of Paint, Coatings and Related Products on Test Panels
5.1 Substrates:
D1005Test Method for Measurement of Dry-Film Thick-
5.1.1 If the purpose of the test is to determine the percent of
ness of Organic Coatings Using Micrometers
elongation of the coating material, the substrate shall be
D2370Test Method for Tensile Properties of Organic Coat-
1
cold-rolled steel strip 0.8 mm [ ⁄32 in.] (22 gage) thick.
ings
5.1.2 If the purpose of the test is to rate the coated material
D7091Practice for Nondestructive Measurement of Dry
for resistance to cracking, the substrate may be any type of
sheet metal or rubber-type material (for example, steel,
1 aluminum, tinplate, or synthetic rubber). The thickness of the
These test methods are under the jurisdiction of ASTM Committee D01 on
1
Paint and Related Coatings, Materials, and Applications and are the direct
sheetmetalmaybelessthan0.8mm[ ⁄32in.]andthethickness
responsibility of Subcommittee D01.23 on Physical Properties of Applied Paint
1
of the rubber-type materials may be as great as 13 mm [ ⁄2 in.].
Films.
5.1.3 The recommended panel size is 100 mm [4 in.] in
Current edition approved Nov. 1, 2021. Published November 2021. Originally
widthand150mm[6in.]inlength.Themaximumsizethatthe
approved in 1939. Last previous edition approved in 2017 as D522/D522M–17.
1
DOI: 10.1520/D0522_D0522M-17R21.
conical mandrel can accommodate is 115 mm [4 ⁄2 in.] wide
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
and 190 mm [7 ⁄2 in.] long.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1.4 The surface preparation of the substrate shall be
Standards volume information, refer to
...

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5.1 Pencil hardness measurements have been used by the coatings industry for many years to determine the hardness of clear and pigmented organic coating films. This test method has also been used to determine the cure of these coatings, especially when using forced dried heat.  
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5.1 Stresses in coatings arise as a result of their shrinkage or expansion if expected movements are prevented by coating adhesion to its substrate.  
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ASTM D5179-16(2021)(Test Method)
Standard Test Method for Measuring Adhesion of Organic Coatings in the Laboratory by Direct Tensile Method

SIGNIFICANCE AND USE
4.1 The pull-off strength (commonly referred to as adhesion) of a coating is an important performance property that has been used in specifications. This test method serves as a means for uniformly preparing and testing organic coatings on plastic or other substrates.4 Further information may be found in Appendix X1.
SCOPE
1.1 This test method covers the laboratory determination of organic coating adhesion to plastic substrates by mounting and removing a metal stud from the surface of the coating and measuring the force required to break the coating/substrate bond with a tensile tester. This test method may also be applied to substrates other than plastic.  
1.2 This test method requires that the metal stud be adhered directly to the surface of a coated, cured panel (Fig. 1).
FIG. 1 Direct Tensile Model  
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1.4 Other tensile test methods are Test Methods D4541, D7234, D7522, and ISO 4624 (but are not technically equivalent).  
1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.  
1.6 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.  
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ASTM D2370-16(2021)(Test Method)
Standard Test Method for Tensile Properties of Organic Coatings

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5.1 Tensile properties determined by this method are of value in studying the behavior of coatings subjected to environmental stresses, such as those produced by aging and weathering. (See Refs. (1-10).)4  
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