ASTM D968-15

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

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 may also provide 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 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.
Note 1: All dimensions are given in inches. 1 in. = 25.4 mm.
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:    
Sections  
Method A—Falling Sand Abrasion Test  
6 – 13  
Method B—Falling Silicon Carbide Abrasion Test  
14 – 21  
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.  
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-May-2015
• 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

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 − 15
Standard Test Methods for
Abrasion Resistance of Organic Coatings by Falling
1
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 U.S. Department of Defense.
1. Scope D7091 Practice for Nondestructive Measurement of Dry
Film Thickness of Nonmagnetic Coatings Applied to
1.1 These test methods cover the determination of the
Ferrous Metals and Nonmagnetic, Nonconductive Coat-
resistance of organic coatings to abrasion produced by abrasive
ings Applied to Non-Ferrous Metals
falling onto coatings applied to a plane rigid surface, such as a
E11 Specification for Woven Wire Test Sieve Cloth and Test
metal or glass panel.
Sieves
1.2 Two test methods based on different abrasives are
2.2 Other Standards:
covered as follows:
ANSI B74.12 Specifications for the Size of Abrasive Grain
Sections
— Grinding Wheels, Polishing and General Industrial
Method A—Falling Sand Abrasion Test 6–13
3
Uses
Method B—Falling Silicon Carbide Abrasion Test 14–21
FEPA Standard 42-2:2006 Grains of Fused Aluminum
1.3 These methods should be restricted to testing in only
Oxide, Silicon Carbide and other Abrasive Materials for
one laboratory when numerical values are used because of the
Bonded Abrasives and for General Applications — Mi-
poor reproducibility of the methods (see 13.1.2 and 21.1.2).
4
crogrits F230 to F2000
Interlaboratoryagreementisimprovedsignificantlywhenrank-
ing is used in place of numerical values.
3. Terminology
1.4 The values stated in SI units are to be regarded as the
3.1 Definitions of Terms Specific to This Standard:
standard. The values given in parentheses are for information
3.1.1 abrasion resistance, n—the amount of abrasive re-
only.
quired to wear through a unit film thickness of the coating.
1.5 This standard does not purport to address the safety
concerns, if any, associated with its use. It is the responsibility
4. Summary of Test Method
of the user of this standard to establish appropriate safety and
4.1 Abrasive is allowed to fall from a specified height
health practices and determine the applicability of regulatory
through a guide tube onto a coated panel until the substrate
limitations prior to use.
becomes visible. The amount of abrasive per unit film thick-
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:
D823 Practices for Producing Films of Uniform Thickness
5. Significance and Use
of Paint, Varnish, and Related Products on Test Panels
5.1 Silica sand produces a slower rate of abrasion for
D1005 Test Method for Measurement of Dry-Film Thick-
organic coatings than that provided by silicon carbide. For
ness of Organic Coatings Using Micrometers
some types of coatings, it may also provide greater differen-
tiation.
1
These test methods are under the jurisdiction of ASTM Committee D01 on
5.2 The abrasion resistance scales produced by the two
Paint and Related Coatings, Materials, and Applications and are the direct
responsibility of Subcommittee D01.23 on Physical Properties of Applied Paint methods differ, but the methods provide approximately the
Films.
same rankings of coatings for abrasion resistance.
Current edition approved June 1, 2015. Published June 2015. Originally
approved in 1948. Last previous edition approved in 2010 as D968 – 05 (2010).
DOI: 10.1520/D0968-15.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM 4th Floor, New York, NY 10036, http://www.ansi.org.
4
Standards volume information, refer to the standard’s Document Summary page on Available from Federation of European Producers ofAbrasives (FEPA), 20, av.
the ASTM website. Reille, Paris, F-75014, www.fepa-abrasives.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D968 − 15
MethodA(falling sand) has been used for rating floor coatings
while Method B (falling silicon carbide) has been used for
rating coatings for ship decks.
5
METHOD A—FALLING SAND ABRASION TEST
6. Apparatus and Materials
6.1 Abrasion Tester,asillustratedinFig.1andFig.2.Agate
for starting the flow of abrasive is located near the top of the
guide tube. It consists of a metal disk inserted into a sli
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D968 − 05 (Reapproved 2010) D968 − 15
Standard Test Methods for
Abrasion Resistance of Organic Coatings by Falling
1
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 U.S. Department of Defense.
1. 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:
Sections
Method A—Falling Sand Abrasion Test 1 – 12
Method A—Falling Sand Abrasion Test 6 – 13
Method B—Falling Silicon Carbide Abrasion Test 13 – 19
Method B—Falling Silicon Carbide Abrasion Test 14 – 21
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.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
D1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
D1186D7091 Test Methods Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied
to a Ferrous BaseFerrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals (Withdrawn
2006)
D1400 Test Method for Nondestructive Measurement of Dry Film Thickness of Nonconductive Coatings Applied to a
3
Nonferrous Metal Base (Withdrawn 2006)
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
2.2 Other Standards:
3
ANSI B74.12 Specifications for the Size of Abrasive Grain — Grinding Wheels, Polishing and General Industrial Uses
42-GB-1984-R1993 FEPAFEPA Standard 42-2:2006 Standard for bonded abrasive grains of fused aluminum oxide and silicon
carbideGrains of Fused Aluminum Oxide, Silicon Carbide and other Abrasive Materials for Bonded Abrasives and for General
4
Applications — Microgrits F230 to F2000
1
These test methods are under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and are the direct responsibility of
Subcommittee D01.23 on Physical Properties of Applied Paint Films.
Current edition approved Dec. 1, 2010June 1, 2015. Published December 2010June 2015. Originally approved in 1948. Last previous edition approved in 20052010 as
ε1
D968 – 05 (2010). . DOI: 10.1520/D0968-05R10.10.1520/D0968-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
4
Available from The British Abrasive Federation, Trafford Park Road, Trafford Park, Manchester M17 1JD, England.Federation of European Producers of Abrasives
(FEPA), 20, av. Reille, Paris, F-75014, www.fepa-abrasives.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D968 − 15
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 abrasion resistance, n—the amount of abrasive required to wear through a unit film thickness of the coating.
4. Summary of Test Method
4.1 Abrasive is allowed to fall from a specified height through a guide tube onto a coated panel until the substrate becomes
visible. The amount of abrasive per unit film thickness is reported as the abrasion resistance
...