Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive

SIGNIFICANCE AND USE
Silica sand produces a slower rate of abrasion for organic coatings than that provided by silicon carbide. For some types of coatings, it also provides greater differentiation.
The abrasion resistance scales produced by the two methods differ, but the methods provide approximately the same rankings of coatings for abrasion resistance.
Each of the methods has been found useful for rating the abrasion resistance of specific types of coatings. For example Method A (falling sand) has been used for rating floor coatings while Method B (falling silicon carbide) has been used for rating coatings for ship decks.
FIG. 1 Apparatus for Falling Sand Abrasion Test
SCOPE
1.1 These test methods cover the determination of the resistance of organic coatings to abrasion produced by abrasive falling onto coatings applied to a plane rigid surface, such as a metal or glass panel.
1.2 Two test methods based on different abrasives are covered as follows:
1.3 These methods should be restricted to testing in only one laboratory when numerical values are used because of the poor reproducibility of the methods (see 13.1.2 and 21.1.2). Interlaboratory agreement is improved significantly when ranking is used in place of numerical values.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
This standard does not purport to address 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-Aug-2005
Current Stage
Ref Project

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ASTM D968-05e1 - Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
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Designation:D968–05
Standard Test Methods for
Abrasion Resistance of Organic Coatings by Falling
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Abrasive
This standard is issued under the fixed designation D968; 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 Department of Defense.
1
´ NOTE—Value for No. 10 sieve in 14.2 was corrected editorially in February 2007.
1. Scope D823 Practices for Producing Films of Uniform Thickness
of Paint, Varnish, and Related Products on Test Panels
1.1 These test methods cover the determination of the
D1005 Test Method for Measurement of Dry-Film Thick-
resistance of organic coatings to abrasion produced by abrasive
ness of Organic Coatings Using Micrometers
falling onto coatings applied to a plane rigid surface, such as a
D1186 Test Methods for Nondestructive Measurement of
metal or glass panel.
Dry Film Thickness of Nonmagnetic Coatings Applied to
1.2 Two test methods based on different abrasives are
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a Ferrous Base
covered as follows:
D1400 Test Method for Nondestructive Measurement of
Sections
DryFilmThicknessofNonconductiveCoatingsAppliedto
Method A—Falling Sand Abrasion Test 1-12
3
Method B—Falling Silicon Carbide Abrasion Test 13-19
a Nonferrous Metal Base
E11 SpecificationforWovenWireTestSieveClothandTest
1.3 These methods should be restricted to testing in only
Sieves
one laboratory when numerical values are used because of the
2.2 Other Standards:
poor reproducibility of the methods (see 13.1.2 and 21.1.2).
ANSI B74.12 Specifications for the Size of Abrasive
Interlaboratoryagreementisimprovedsignificantlywhenrank-
Grain — Grinding Wheels, Polishing and General Indus-
ing is used in place of numerical values.
4
trial Uses
1.4 The values stated in SI units are to be regarded as the
42-GB-1984-R1993 FEPA Standard for bonded abrasive
standard. The values given in parentheses are for information
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grains of fused aluminum oxide and silicon carbide
only.
1.5 This standard does not purport to address the safety
3. Terminology
concerns, if any, associated with its use. It is the responsibility
3.1 Description of Term Specific to This Standard:
of the user of this standard to establish appropriate safety and
3.1.1 abrasion resistance, n—the amount of abrasive re-
health practices and determine the applicability of regulatory
quired to wear through a unit film thickness of the coating.
limitations prior to use.
4. Summary of Test Methods
2. Referenced Documents
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4.1 Abrasive is allowed to fall from a specified height
2.1 ASTM Standards:
through a guide tube onto a coated panel until the substrate
becomes visible. The amount of abrasive per unit film thick-
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These test methods are under the jurisdiction of ASTM Committee D01 on
ness is reported as the abrasion resistance of the coating on the
Paint and Related Coatings, Materials, and Applications and are the direct
panel. Silica sand or silicon carbide may be used, as specified.
responsibility of Subcommittee D01.23 on Physical Properties of Applied Paint
Films.
Current edition approved Sept. 1, 2005. Published September 2005. Originally
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approved in 1948. Last previous edition approved in 2001 as D968 – 93 (2001). Withdrawn. The last approved version of this historical standard is referenced
DOI: 10.1520/D0968-05E01. on www.astm.org.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 4th Floor, New York, NY 10036, http://www.ansi.org.
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Standards volume information, refer to the standard’s Document Summary page on Available from The British Abrasive Federation, Trafford Park Road, Trafford
the ASTM website. Park, Manchester M17 1JD, England.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D968–05
5. Significance and Use
5.1 Silica sand produces a slower rate of abrasion for
organic coatings than that provided by silicon carbide. For
some types of coatings, it also provides greater differentiation.
5.2 The abrasion resistance scales produced by the two
methods differ, but the methods provide approximately the
same rankings of coatings for abrasion resistance.
5.3 Eachofthemethodshasbeenfoundusefulforratingthe
abrasion resistance of specific types of coatings. For example
MethodA(falling sand) has been used for rating floor coatings
while Method B (falling silicon carbide) has been used for
rating coating
...

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