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ASTM D522-93a(2008)

(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
Coatings attached to substrates are elongated when the substrates 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.
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 SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
14-Feb-2008
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

Replaces
ASTM D522-93a(2001) - Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings
Effective Date
15-Feb-2008
Replaced By
ASTM D522/D522M-13 - Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings
Effective Date
01-Nov-2013
Referred By
ASTM D3451-06(2017) - Standard Guide for Testing Coating Powders and Powder Coatings
Effective Date
15-Feb-2008
Referred By
ASTM D3322-23 - Standard Practice for Testing Primers and Primer Surfacers Over Preformed Metal
Effective Date
15-Feb-2008
Referred By
ASTM D5324-16(2022) - Standard Guide for Testing Water-Borne Architectural Coatings
Effective Date
15-Feb-2008
Referred By
ASTM D2454-23 - Standard Practice for Determining the Effect of Overbaking on Organic Coatings
Effective Date
15-Feb-2008
Referred By
ASTM D7270-07(2021) - Standard Guide for Environmental and Performance Verification of Factory-Applied Liquid Coatings
Effective Date
15-Feb-2008
Referred By
ASTM D6905-20 - Standard Practice for Impact Flexibility of Organic Coatings
Effective Date
15-Feb-2008
Referred By
ASTM D5146-10(2019) - Standard Guide to Testing Solvent-Borne Architectural Coatings
Effective Date
15-Feb-2008
Referred By
ASTM D6577-15(2019) - Standard Guide for Testing Industrial Protective Coatings
Effective Date
15-Feb-2008
Referred By
ASTM F1178-11(2022) - Standard Specification for Performance of Enameling System, Baking, Metal Joiner Work and Furniture
Effective Date
15-Feb-2008
Referred By
ASTM D6763-16(2022) - Standard Guide for Testing Exterior Wood Stains and Clear Water Repellents
Effective Date
15-Feb-2008
Referred By
ASTM D333-01(2021) - Standard Guide for Clear and Pigmented Lacquers
Effective Date
15-Feb-2008
Referred By
ASTM D3794-22 - Standard Guide for Testing Coil Coatings
Effective Date
15-Feb-2008
Referred By
ASTM D2485-22 - Standard Test Methods for Evaluating Coatings For High Temperature Service
Effective Date
15-Feb-2008

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ASTM D522-93a(2008) - Standard Test Methods for Mandrel Bend Test of Attached Organic CoatingsASTM D522-93a(2008) - Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings
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ASTM D522-93a(2008) - Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D522 −93a(Reapproved 2008)
Standard Test Methods for
1
Mandrel Bend Test of Attached Organic Coatings
This standard is issued under the fixed designation D522; 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 Department of Defense.
1. Scope mandrel and the resistance to cracking of the coating is
determined. In Test Method A the coated panels are bent over
1.1 These test methods cover the determination of the
aconicalmandrel.InTestMethodBthecoatedpanelsarebent
resistance to cracking (flexibility) of attached organic coatings
over cylindrical mandrels of various diameters.
on substrates of sheet metal or rubber-type materials.
1.2 The values stated in SI units are to be regarded as the
4. Significance and Use
standard. The values given in parentheses are for information
4.1 Coatings attached to substrates are elongated when the
only.
substrates are bent during the manufacture of articles or when
1.3 This standard does not purport to address all of the
thearticlesareabusedinservice.Thesetestmethodshavebeen
safety concerns, if any, associated with its use. It is the
useful in rating attached coatings for their ability to resist
responsibility of the user of this standard to establish appro-
cracking when elongated. They have been useful in evaluating
priate safety and health practices and determine the applica-
the flexibility of coatings on flexible substrates.
bility of regulatory limitations prior to use.
5. Test Specimen
2. Referenced Documents
2 5.1 Substrates:
2.1 ASTM Standards:
5.1.1 Ifthepurposeofthetestistodeterminethepercentof
D823Practices for Producing Films of Uniform Thickness
elongation of the coating material, the substrate shall be
of Paint, Varnish, and Related Products on Test Panels
1
cold-rolled steel strip 0.8 mm ( ⁄32 in.) (22 gage) thick.
D1005Test Method for Measurement of Dry-Film Thick-
5.1.2 If the purpose of the test is to rate the coated material
ness of Organic Coatings Using Micrometers
for resistance to cracking, the substrate may be any type of
D1186Test Methods for Nondestructive Measurement of
sheet metal or rubber-type material (for example, steel,
Dry Film Thickness of Nonmagnetic CoatingsApplied to
3 aluminum, tinplate, or synthetic rubber). The thickness of the
a Ferrous Base (Withdrawn 2006)
1
sheetmetalmaybelessthan0.8mm( ⁄32in.)andthethickness
D1400TestMethodforNondestructiveMeasurementofDry
1
of the rubber-type materials may be as great as 13 mm ( ⁄2 in.).
Film Thickness of Nonconductive Coatings Applied to a
3 5.1.3 The recommended panel size is 100 mm (4 in.) in
Nonferrous Metal Base (Withdrawn 2006)
widthand150mm(6in.)inlength.Themaximumsizethatthe
1
conical mandrel can accommodate is 115 mm (4 ⁄2 in.) wide
3. Summary of Test Method
1
and 190 mm (7 ⁄2 in.) long.
3.1 The coating materials under test are applied at uniform
5.1.4 The surface preparation of the substrate shall be
thickness to panels of sheet metal or rubber-type materials.
agreed upon between the purchaser and the seller. Prior to the
After drying or curing the coated panels are bent over a
application of the coating, round slightly the edges of metal
panels to remove burrs in order to eliminate anomalous edge
1
These test methods are under the jurisdiction of ASTM Committee D01 on
effects.
Paint and Related Coatings, Materials, and Applications and are the direct
NOTE 1—If elongations are to be determined for coatings applied to
responsibility of Subcommittee D01.23 on Physical Properties of Applied Paint
1
Films. substrates other than 0.8 mm ( ⁄32 in.) thick cold-rolled steel, they must be
Current edition approved Feb. 15, 2008. Published February 2008. Originally measured with a special mandrel jig as described in Appendix X1.2.
approved in 1939. Last previous edition approved in 2001 as D522–93a(2001).
5.2 Coated Panels:
DOI: 10.1520/D0522-93AR08.
2
5.2.1 Apply uniform coatings of the materials under test to
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
thesubstratesinaccordancewithPracticesD823andairdryor
Standards volume information, refer to the standard’s Document Summary page on
bake under conditions mutually agreeable to the purchaser and
the ASTM website.
3
the seller. If percent elongation is to be measured, a minimum
The last approved version of this historical standard is referenced on
1
www.astm.org. thickness of 1.0 mil is required on 0.8 mm ( ⁄32 in.) thick
Copyright © ASTM International, 100 Barr Harbor Drive, P
...

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5.2 Most protective and high performance coatings are applied to meet a requirement or a specification for the dry-film thickness of each coat, or for the complete system, or both. Coatings must be applied within certain minimum and maximum thickness tolerances in order that they can fulfill their intended function. In addition to potential performance deficiencies, it is uneconomical to apply more material than necessary when coating large areas such as floors and walls.  
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SCOPE
1.1 This test method describes the use of ultrasonic film thickness gages to measure accurately and nondestructively the dry film thickness of organic coatings applied over a substrate of dissimilar material. Measurements may be made on field structures, on commercially manufactured products, or on laboratory test specimens. These types of gages can accurately measure the dry film thickness of organic coatings on a variety of substrates such as concrete, wood, wallboard, plastic, fiber composites and metal.  
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FIG. 1 Direct Tensile Model  
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