ASTM D522-93a(2001)
(Test Method)Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings
Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings
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.
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Designation: D 522 – 93a (Reapproved 2001)
Standard Test Methods for
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Mandrel Bend Test of Attached Organic Coatings
This standard is issued under the fixed designation D 522; 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 (e) 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 a conical mandrel. InTest Method B the coated panels are bent
over cylindrical mandrels of various diameters.
1.1 These test methods cover the determination of the
resistance to cracking (flexibility) of attached organic coatings
4. Significance and Use
on substrates of sheet metal or rubber-type materials.
4.1 Coatings attached to substrates are elongated when the
1.2 The values stated in SI units are to be regarded as the
substrates are bent during the manufacture of articles or when
standard. The values given in parentheses are for information
thearticlesareabusedinservice.Thesetestmethodshavebeen
only.
useful in rating attached coatings for their ability to resist
1.3 This standard does not purport to address all of the
cracking when elongated. They have been useful in evaluating
safety concerns, if any, associated with its use. It is the
the flexibility of coatings on flexible substrates.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Test Specimen
bility of regulatory limitations prior to use.
5.1 Substrates:
5.1.1 If the purpose of the test is to determine the percent of
2. Referenced Documents
elongation of the coating material, the substrate shall be
2.1 ASTM Standards:
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cold-rolled steel strip 0.8 mm ( ⁄32 in.) (22 gage) thick.
D 823 Practices for Producing Films of Uniform Thickness
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5.1.2 If the purpose of the test is to rate the coated material
of Paint, Varnish, and Related Products on Test Panels
for resistance to cracking, the substrate may be any type of
D 1005 Test Methods for Measurement of Dry-Film Thick-
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sheet metal or rubber-type material (for example, steel, alumi-
ness of Organic Coatings Using Micrometers
num, tinplate, or synthetic rubber). The thickness of the sheet
D 1186 Test Methods for Nondestructive Measurement of
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metalmaybelessthan0.8mm( ⁄32in.)andthethicknessofthe
Dry Film Thickness of Nonmagnetic Coatings Applied to
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2 rubber-type materials may be as great as 13 mm ( ⁄2 in.).
a Ferrous Base
5.1.3 The recommended panel size is 100 mm (4 in.) in
D 1400 Test Method for Nondestructive Measurement of
width and 150 mm (6 in.) in length.The maximum size that the
DryFilmThicknessofNonconductiveCoatingsAppliedto
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2 conical mandrel can accommodate is 115 mm (4 ⁄2 in.) wide
a Nonferrous Metal Base
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and 190 mm (7 ⁄2 in.) long.
3. Summary of Test Method 5.1.4 The surface preparation of the substrate shall be
agreed upon between the purchaser and the seller. Prior to the
3.1 The coating materials under test are applied at uniform
application of the coating, round slightly the edges of metal
thickness to panels of sheet metal or rubber-type materials.
panels to remove burrs in order to eliminate anomalous edge
After drying or curing the coated panels are bent over a
effects.
mandrel and the resistance to cracking of the coating is
determined. In Test Method A the coated panels are bent over
NOTE 1—If elongations are to be determined for coatings applied to
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substrates other than 0.8 mm ( ⁄32 in.) thick cold-rolled steel, they must be
measured with a special mandrel jig as described in Appendix X1.2.
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5.2 Coated Panels:
ThesetestmethodsareunderthejurisdictionofASTMCommitteeD-1onPaint
and Related Coatings, Materials, andApplications and is the direct responsibility of
5.2.1 Apply uniform coatings of the materials under test to
Subcommittee D01.23 on Physical Properties of Applied Paint Films.
thesubstratesinaccordancewithPracticesD 823andairdryor
Current edition approved Sept. 15, 1993. Published November 1993. Originally
bake under conditions mutually agreeable to the purchaser and
published as D 522 – 39. Last previous edition D 522 – 93.
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Annual Book of ASTM Standards, Vol 06.01. the seller. If percent elongation is to be measured, a minimum
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D 522
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thickness of 1.0 mil is required on 0.8 mm ( ⁄32 in.) thick talc, between the specimen and the drawbar and hold in
cold-rolled steel. Perform a minimum of three determinations position only by the pressure of the drawbar against the paper.
of coating thickness
...
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