ASTM D6279-03
(Test Method)Test Method for Rub Abrasion Mar Resistance of High Gloss Coatings
Test Method for Rub Abrasion Mar Resistance of High Gloss Coatings
SCOPE
1.1 This test method covers procedures for evaluating the relative mar resistance of a series of high gloss coatings applied to a flat, rigid surface. Wet rub and dry rub abrasion tests are described. To fully characterize a coating's mar resistance, both tests should be run.
Note 1—Dry abrasion mar resistance can also be evaluated by using Test Methods D 6037. If a series of very highly mar resistant coatings is being evaluated, Test Methods D 6037 will generally provide the better performance discrimination than the dry rub test described here. However, if the equipment described in Test Methods D 6037 is not available, the dry rub test described in this test method affords a reasonable alternative. The dry rub test is also useful for evaluating coatings that are not highly mar resistant.
1.2 Mar resistance is assessed by measuring the gloss of the abraded and unabraded areas. Mar resistance is directly related to the coating's ability to retain gloss in abraded areas.
Note 2—The mar resistance values obtained by this test method have no absolute significance. They should only be used to derive relative performance rankings for test panels that have been prepared from the series of coatings that are currently being evaluated. If mar resistance values are quoted between laboratories, it is essential that a common standard be measured and that the values be compared to that standard. Even then, the values should be used with caution.
1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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:D6279–03
Standard Test Method for
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Rub Abrasion Mar Resistance of High Gloss Coatings
This standard is issued under the fixed designation D 6279; 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.
1. Scope D 1005 Test Method for Measurement of Dry-Film Thick-
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ness of Organic Coatings Using Micrometers
1.1 This test method covers procedures for evaluating the
D 1186 Test Methods for Nondestructive Measurement of
relativemarresistanceofaseriesofhighglosscoatingsapplied
Dry Film Thickness of Nonmagnetic Coatings Applied to
to a flat, rigid surface. Wet rub and dry rub abrasion tests are
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a Ferrous Base
described. To fully characterize a coating’s mar resistance,
D 1400 Test Method for Nondestructive Measurement of
both tests should be run.
DryFilmThicknessofNonconductiveCoatingsAppliedto
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NOTE 1—Dry abrasion mar resistance can also be evaluated by using
a Nonferrous Metal Base
Test Methods D 6037. If a series of very highly mar resistant coatings is
D 3924 Specification for Standard Environment for Condi-
being evaluated, Test Methods D 6037 will generally provide the better
tioning and Testing Paint, Varnish, Lacquer, and Related
performance discrimination than the dry rub test described here. However,
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Materials
if the equipment described in Test Methods D 6037 is not available, the
dry rub test described in this test method affords a reasonable alternative. D 6037 Test Methods for Dry Abrasion Mar Resistance of
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The dry rub test is also useful for evaluating coatings that are not highly
High Gloss Coatings
mar resistant.
3. Terminology
1.2 Mar resistance is assessed by measuring the gloss of the
3.1 Definitions of Terms Specific to This Standard:
abraded and unabraded areas. Mar resistance is directly related
3.1.1 mar resistance—The ability of a coating to resist
to the coating’s ability to retain gloss in abraded areas.
permanent deformation or fracture, resulting from the applica-
NOTE 2—The mar resistance values obtained by this test method have
tion of a dynamic mechanical force.
no absolute significance. They should only be used to derive relative
3.1.1.1 Discussion—This test method measures resistance
performance rankings for test panels that have been prepared from the
to visible damage caused by mild abrasion.
series of coatings that are currently being evaluated. If mar resistance
values are quoted between laboratories, it is essential that a common
4. Summary of Test Method
standard be measured and that the values be compared to that standard.
Even then, the values should be used with caution.
4.1 The coatings that are being evaluated are applied at
uniform dry film thickness to planar panels of uniform surface
1.3 The values stated in inch-pound units are to be regarded
texture. After drying or curing, or both, panels are marred by
as the standard. The values given in parentheses are for
the action of dry abrasion media or wet abrasion media, or
information only.
both, under a reciprocating weighted pad. Mar resistance is
1.4 This standard does not purport to address the safety
assessed by measuring the coating’s gloss within the abraded
concerns, if any, associated with its use. It is the responsibility
and unabraded areas of test panels. Mar resistance is directly
of the user of this standard to establish appropriate safety and
related to the coating’s ability to retain gloss in abraded areas.
health practices and determine the applicability of regulatory
limitations prior to use.
5. Significance and Use
2. Referenced Documents
5.1 Coatings, particularly the high gloss coatings used on
automobiles, boats, toys, etc., are subject of a wide variety of
2.1 ASTM Standards:
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conditions (for example, wiping, cleaning and exposure) dur-
D 523 Test Method for Specular Gloss
ing manufacture and service that can mar their surface. The
D 823 Practices for Producing Films of Uniform Thickness
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ability of high gloss coatings to maintain their appearance is an
of Paint, Varnish, and Related Products on Test Panels
important product attribute.This test method provides a way to
estimatetheabilityofhighglosscoatingstoresistmardamage.
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
6. Apparatus
Subcommittee D01.55 on Factory Applied Coatings on Preformed Products.
6.1 Application Equipment, as described in Practices D 823.
Current edition approved Oct. 1, 2003. Published October 2003.Originally
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approved in 1998. Last previous edition approved in 1999 as D 6279 – 99 .
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Annual B
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