ASTM_D_6279_-_20.pdf

Designation:D627920Standard Test Method forRub Abrasion Mar Resistance of High Gloss Coatings1This standard is issued under the fixed designation D6279;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers procedures for evaluating therelative mar resistance of a high gloss coating applied to a flat,rigid surface.Wet rub and dry rub abrasion tests are described.To fully characterize a coatings mar resistance,both testsshould be run.NOTE1Dry abrasion mar resistance can also be evaluated by usingTest Methods D6037.If a very highly mar resistant coating is beingevaluated,Test Methods D6037 will generally provide the better perfor-mance discrimination than the dry rub test described here.However,if theequipment described in Test Methods D6037 is not available,the dry rubtest described in this test method affords a reasonable alternative.The dryrub test is also useful for evaluating coatings that are not highly marresistant.1.2 Mar resistance is assessed by measuring the gloss of theabraded and unabraded areas.Mar resistance is directly relatedto the coatings ability to retain gloss in abraded areas.NOTE2The mar resistance values obtained by this test method haveno absolute significance.They should only be used to derive relativeperformance rankings for test panels that have been prepared from theseries of coatings that are currently being evaluated.If mar resistancevalues are quoted between laboratories,it is essential that a commonstandard 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 SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D16 Terminology for Paint,Related Coatings,Materials,andApplicationsD523 Test Method for Specular GlossD823 Practices for Producing Films of Uniform Thicknessof Paint,Coatings and Related Products on Test PanelsD1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD3924 Specification for Standard Environment for Condi-tioning and Testing Paint,Varnish,Lacquer,and RelatedMaterialsD4449 Test Method for Visual Evaluation of Gloss Differ-ences Between Surfaces of Similar AppearanceD6037 Test Methods for Dry Abrasion Mar Resistance ofHigh Gloss CoatingsD7091 Practice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic,Nonconductive Coat-ings Applied to Non-Ferrous Metals3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 mar resistance,nthe ability of a coating to resistpermanent deformation or fracture,resulting from the applica-tion of a dynamic mechanical force.3.1.1.1 DiscussionThis test method measures resistance tovisible damage caused by mild abrasion.3.2 For definitions of other terms used in this standard,referto Terminology D16.4.Summary of Test Method4.1 The coatings that are being evaluated are applied atuniform dry film thickness to planar panels of uniform surfacetexture.After drying or curing,or both,panels are marred bythe action of dry abrasion media or wet abrasion media,orboth,under a reciprocating weighted friction pad.Mar resis-tance is assessed by measuring the coatings gloss within the1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.55 on Factory Applied Coatings on Preformed Products.Current edition approved Dec.1,2020.Published December 2020.Originallyapproved in 1998.Last previous edition approved in 2015 as D6279 15.DOI:10.1520/D6279-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles o