ASTM D968-93(2001)
(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 Test1-12Method B--Falling Silicon Carbide Abrasion Test13-19
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.
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Designation:D968–93 (Reapproved 2001)
Standard Test Methods for
Abrasion Resistance of Organic Coatings by Falling
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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 DryFilmThicknessofNonconductiveCoatingsAppliedto
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a Nonferrous Metal Base
1.1 These test methods cover the determination of the
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
resistance of organic coatings to abrasion produced by abrasive
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poses
falling onto coatings applied to a plane rigid surface, such as a
metal or glass panel.
3. Terminology
1.2 Two test methods based on different abrasives are
3.1 Description of Term Specific to This Standard:
covered as follows:
3.1.1 abrasion resistance—the amount of abrasive required
Sections
to wear through a unit film thickness of the coating.
Method A—Falling Sand Abrasion Test 1-12
Method B—Falling Silicon Carbide Abrasion Test 13-19
4. Summary of Test Methods
1.3 These methods should be restricted to testing in only
4.1 Abrasive is allowed to fall from a specified height
one laboratory when numerical values are used because of the
through a guide tube onto a coated panel until the substrate
poor reproducibility of the methods (see 13.1.2 and 21.1.2).
becomes visible. The amount of abrasive per unit film thick-
Interlaboratoryagreementisimprovedsignificantlywhenrank-
ness is reported as the abrasion resistance of the coating on the
ing is used in place of numerical values.
panel. Silica sand or silicon carbide may be used, as specified.
1.4 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
5. Significance and Use
only.
5.1 Silica sand produces a slower rate of abrasion for
1.5 This standard does not purport to address the safety
organic coatings than provided by silicon carbide but, for some
concerns, if any, associated with its use. It is the responsibility
types of coatings, it provides greater discrimination.
of the user of this standard to establish appropriate safety and
5.2 The abrasion resistance scales produced by the two
health practices and determine the applicability of regulatory
methods differ, but the methods provide approximately the
limitations prior to use.
same rankings of coatings for abrasion resistance.
2. Referenced Documents 5.3 Each of the methods has been found useful for rating the
abrasion resistance of specific types of coatings. For example
2.1 ASTM Standards:
MethodA(falling sand) has been used for rating floor coatings
D 823 Practices for Producing Films of Uniform Thickness
2 while Method B (falling silicon carbide) has been used for
of Paint, Varnish, and Related Products on Test Panels
rating coatings for ship decks.
D 1005 Test Method for Measurement of Dry-Film Thick-
2
ness of Organic Coatings Using Micrometers
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METHOD A—FALLING SAND ABRASION TEST
D 1186 Test Methods for Nondestructive Measurement of
Dry Film Thickness of Nonmagnetic Coatings Applied to
6. Apparatus and Materials
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a Ferrous Base
6.1 Abrasion Tester,asillustratedinFig.1andFig.2.Agate
D 1400 Test Method for Nondestructive Measurement of
for starting the flow of abrasive is located near the top of the
guide tube. It consists of a metal disk inserted into a slit in the
side of the guide tube with a collar covering the slit. The guide
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tube shall be firmly supported in a vertical position over a
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.
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Current edition approved Sept. 15, 1993. Published November 1993. Originally Annual Book of ASTM Standards, Vol 14.02.
e1 4
published as D 968 – 48 T. Last previous edition D 968 – 81 (1991) . Hipkins, C. C., and Phain, R. J., “The Falling Sand Abrasion Tester,” ASTM
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Annual Book of ASTM Standards, Vol 06.01. Bulletin, No. 143, December 1946, pp. 18–22.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D968
opening of the tube is directly above the area to be abraded and
the distance from the tube to the coated surface face at the
nearest point is 25 mm (1 in.) when measured in the vertical
direction. The base of the apparatus shall be fitted with
adjusting screws for properly aligning the equipment.
6.2 Standard Abrasive
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