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ASTM D6905-03(2012)

(Test Method)

Standard Test Method for Impact Flexibility of Organic Coatings

Standard Test Method for Impact Flexibility of Organic Coatings

SIGNIFICANCE AND USE
5.1 Coatings attached to substrates are subjected to damaging impacts during the manufacture of articles and their use in service. This impact resistance test method 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 determining the ability of a coating film and its substrate to resist shattering, cracking, or chipping when the film and substrate are distended beyond their original form by impact.  
1.2 This test method does not measure impact resistance but uses rapid impact to improve Test Methods D522, another test method for flexibility. Since the impact of the coating is almost instantaneous, all of the problems associated with time variables in the mandrel tests are eliminated.  
1.3 This test method is similar in content but not technically equivalent to Test Method D2794.  
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.5 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
31-Oct-2012
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

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ASTM D6905-03(2012) - Standard Test Method for Impact Flexibility of Organic CoatingsASTM D6905-03(2012) - Standard Test Method for Impact Flexibility of Organic Coatings
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ASTM D6905-03(2012) - Standard Test Method for Impact Flexibility of Organic Coatings
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D6905 − 03 (Reapproved 2012)
Standard Test Method for
1
Impact Flexibility of Organic Coatings
This standard is issued under the fixed designation D6905; 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.
3
1. Scope a Ferrous Base (Withdrawn 2006)
D1400 TestMethodforNondestructiveMeasurementofDry
1.1 This test method covers a procedure for determining the
Film Thickness of Nonconductive Coatings Applied to a
ability of a coating film and its substrate to resist shattering,
3
Nonferrous Metal Base (Withdrawn 2006)
cracking,orchippingwhenthefilmandsubstratearedistended
D2240 Test Method for Rubber Property—Durometer Hard-
beyond their original form by impact.
ness
1.2 This test method does not measure impact resistance but
D2794 Test Method for Resistance of Organic Coatings to
uses rapid impact to improve Test Methods D522, another test
the Effects of Rapid Deformation (Impact)
method for flexibility. Since the impact of the coating is almost
instantaneous, all of the problems associated with time vari- 3. Terminology
ables in the mandrel tests are eliminated.
3.1 Definitions of Terms Specific to This Standard:
1.3 This test method is similar in content but not technically 3.1.1 impact flexibility, n—of a coating, the percent area
equivalent to Test Method D2794.
increase required to produce cracking in the deformed coating.
1.4 The values stated in SI units are to be regarded as the
4. Summary of Test Method
standard. The values given in parentheses are for information
4.1 The organic coating under test is applied to suitable thin
only.
metal panels. After the coating has cured, a standard weight/
1.5 This standard does not purport to address all of the
indenterisdroppedfromameasureddistancesoastostrikethe
safety concerns, if any, associated with its use. It is the
substrate which deforms the coating and the substrate. The
responsibility of the user of this standard to establish appro-
percent elongation is the highest area of distensibility in which
priate safety and health practices and determine the applica-
there is no film breaks that the film can stand.
bility of regulatory limitations prior to use.
5. Significance and Use
2. Referenced Documents
5.1 Coatings attached to substrates are subjected to damag-
2
2.1 ASTM Standards:
ing impacts during the manufacture of articles and their use in
D522 Test Methods for Mandrel Bend Test of Attached
service. This impact resistance test method has been found to
Organic Coatings
be useful in predicting the performance of organic coatings for
D609 Practice for Preparation of Cold-Rolled Steel Panels
their ability to resist cracking caused by impacts.
for Testing Paint, Varnish, Conversion Coatings, and
Related Coating Products 6. Apparatus
D823 Practices for Producing Films of Uniform Thickness 4
6.1 Impact Flexibility Tester ,assemblyillustratedinFigs.1
of Paint, Varnish, and Related Products on Test Panels
and 2. The instrument contains a 1.63 kg (3.6 lb) weight/
D1186 Test Methods for Nondestructive Measurement of
indenter, a rubber pad and an aluminum pad, Fig. 3. The round
Dry Film Thickness of Nonmagnetic Coatings Applied to
rod weight/indenter’s two spherical ends (Marked “A” and
“B”) are shown in Figs. 4 and 5. The dimensions for the
Spherical weight/indenter are shown in Table 1. The rod slides
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
3
Subcommittee D01.23 on Physical Properties of Applied Paint Films. The last approved version of this historical standard is referenced on
Current edition approved Nov. 1, 2012. Published November 2012. Originally www.astm.org.
4
approved in 2003. Last previous edition approved in 2008 as D6905 – 03 (2008). The sole source of supply of the apparatus known to the committee at this time
DOI: 10.1520/D6905-03R12. is the IM-172-GE ImpactTester, available from the Paul N. Gardner Company, Inc.,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 316 N.E. First Street, Pompano Beach, FL 33060. If you are aware of alternative
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM suppliers, please provide this information to ASTM International Headquarters.
Standards volume information, refer to the standard’s Document Summary page on Your comments will receive careful consideration at a meeting of the responsible
1
the ASTM website. technical committee, which you may attend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,
...

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SCOPE
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FIG. 1 Direct Tensile Model  
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