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ASTM D968-05

(Test Method)

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

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

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:SectionsMethod A-Falling Sand Abrasion TestMethod B-Falling Silicon Carbide Abrasion Test
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 and ). 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.
1.5 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
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 D968-93(2001) - Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive
Effective Date
01-Sep-2005
Replaced By
ASTM D968-05e1 - Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive
Effective Date
01-Sep-2005
Referred By
ASTM D333-01(2021) - Standard Guide for Clear and Pigmented Lacquers
Effective Date
01-Sep-2005
Referred By
ASTM D5324-16(2022) - Standard Guide for Testing Water-Borne Architectural Coatings
Effective Date
01-Sep-2005
Referred By
ASTM D3732-23 - Standard Practice for Reporting Cure Times of Ultraviolet-Cured Coatings
Effective Date
01-Sep-2005
Referred By
ASTM D3451-06(2017) - Standard Guide for Testing Coating Powders and Powder Coatings
Effective Date
01-Sep-2005
Referred By
ASTM D16-23 - Standard Terminology for Paint, Related Coatings, Materials, and Applications
Effective Date
01-Sep-2005
Referred By
ASTM A882/A882M-20 - Standard Specification for Filled Epoxy-Coated Seven-Wire Steel Prestressing Strand
Effective Date
01-Sep-2005
Referred By
ASTM D6763-16(2022) - Standard Guide for Testing Exterior Wood Stains and Clear Water Repellents
Effective Date
01-Sep-2005
Referred By
ASTM D4060-19 - Standard Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser
Effective Date
01-Sep-2005
Referred By
ASTM D3794-22 - Standard Guide for Testing Coil Coatings
Effective Date
01-Sep-2005
Referred By
ASTM D6577-15(2019) - Standard Guide for Testing Industrial Protective Coatings
Effective Date
01-Sep-2005
Referred By
ASTM C647-19 - Standard Guide to Properties and Tests of Mastics and Coating Finishes for Thermal Insulation
Effective Date
01-Sep-2005
Referred By
ASTM D5146-10(2019) - Standard Guide to Testing Solvent-Borne Architectural Coatings
Effective Date
01-Sep-2005
Referred By
ASTM D3322-23 - Standard Practice for Testing Primers and Primer Surfacers Over Preformed Metal
Effective Date
01-Sep-2005

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ASTM D968-05 - Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling AbrasiveASTM D968-05 - Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive
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ASTM D968-05 - Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive
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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:D968–05
Standard Test Methods for
Abrasion Resistance of Organic Coatings by Falling
1
Abrasive
This standard is issued under the fixed designation D 968; 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 Dry Film Thickness of Nonmagnetic Coatings Applied to
a Ferrous Base
1.1 These test methods cover the determination of the
D 1400 Test Method for Nondestructive Measurement of
resistance of organic coatings to abrasion produced by abrasive
DryFilmThicknessofNonconductiveCoatingsAppliedto
falling onto coatings applied to a plane rigid surface, such as a
a Nonferrous Metal Base
metal or glass panel.
E11 Specification for Wire Cloth and Sieves for Testing
1.2 Two test methods based on different abrasives are
Purposes
covered as follows:
2.2 Other Standards:
Sections
ANSI B74.12 Specifications for the Size of Abrasive
Method A—Falling Sand Abrasion Test 1-12
Method B—Falling Silicon Carbide Abrasion Test 13-19
Grain — Grinding Wheels, Polishing and General Indus-
3
trial Uses
1.3 These methods should be restricted to testing in only
42-GB-1984-R1993 FEPA Standard for bonded abrasive
one laboratory when numerical values are used because of the
4
grains of fused aluminum oxide and silicon carbide
poor reproducibility of the methods (see 13.1.2 and 21.1.2).
Interlaboratoryagreementisimprovedsignificantlywhenrank-
3. Terminology
ing is used in place of numerical values.
3.1 Description of Term Specific to This Standard:
1.4 The values stated in SI units are to be regarded as the
3.1.1 abrasion resistance, n—the amount of abrasive re-
standard. The values given in parentheses are for information
quired to wear through a unit film thickness of the coating.
only.
1.5 This standard does not purport to address the safety
4. Summary of Test Methods
concerns, if any, associated with its use. It is the responsibility
4.1 Abrasive is allowed to fall from a specified height
of the user of this standard to establish appropriate safety and
through a guide tube onto a coated panel until the substrate
health practices and determine the applicability of regulatory
becomes visible. The amount of abrasive per unit film thick-
limitations prior to use.
ness is reported as the abrasion resistance of the coating on the
2. Referenced Documents panel. Silica sand or silicon carbide may be used, as specified.
2
2.1 ASTM Standards:
5. Significance and Use
D 823 Practices for Producing Films of Uniform Thickness
5.1 Silica sand produces a slower rate of abrasion for
of Paint, Varnish, and Related Products on Test Panels
organic coatings than that provided by silicon carbide. For
D 1005 Test Method for Measurement of Dry-Film Thick-
some types of coatings, it also provides greater differentiation.
ness of Organic Coatings Using Micrometers
5.2 The abrasion resistance scales produced by the two
D 1186 Test Methods for Nondestructive Measurement of
methods differ, but the methods provide approximately the
same rankings of coatings for abrasion resistance.
5.3 Eachofthemethodshasbeenfoundusefulforratingthe
1
These test methods are under the jurisdiction of ASTM Committee D01 on
abrasion resistance of specific types of coatings. For example
Paint and Related Coatings, Materials, and Applications and are the direct
MethodA(falling sand) has been used for rating floor coatings
responsibility of Subcommittee D01.23 on Physical Properties of Applied Paint
Films.
Current edition approved Sept. 1, 2005. Published September 2005. Originally
approved in 1948. Last previous edition approved in 2001 as D 968 – 93 (2001).
2 3
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.
4
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.
1

---------------------- Page: 1 ----------------------
D968–05
NOTE 1—All dimensions are given in inches. 1 in. = 25.4 mm.
FIG. 2 Design Details of Abrasion Test Apparatus
FIG. 1 Apparatus for Falling Sand Abrasion Test
The sand is characterized by its roundness of grains and has
a silicon dioxide content greater than 99 %. Use the sieves
while Method B (falli
...

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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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