ASTM_D_6279_-_03_2013.pdf

Designation:D627903(Reapproved 2013)Standard 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 series of high gloss coatings appliedto a flat,rigid surface.Wet rub and dry rub abrasion tests aredescribed.To fully characterize a coatings mar resistance,both tests should be run.NOTE1Dry abrasion mar resistance can also be evaluated by usingTest Methods D6037.If a series of very highly mar resistant coatings isbeing evaluated,Test Methods D6037 will generally provide the betterperformance discrimination than the dry rub test described here.However,if the equipment described in Test Methods D6037 is not available,the dryrub test described in this test method affords a reasonable alternative.Thedry rub 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 the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D523 Test Method for Specular GlossD823 Practices for Producing Films of Uniform Thicknessof Paint,Varnish,and Related Products on Test PanelsD1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD1186 Test Methods for Nondestructive Measurement ofDry Film Thickness of Nonmagnetic Coatings Applied toa Ferrous Base(Withdrawn 2006)3D1400 Test Method for Nondestructive Measurement of DryFilm Thickness of Nonconductive Coatings Applied to aNonferrous Metal Base(Withdrawn 2006)3D3924 Specification for Environment for Conditioning andTesting Paint,Varnish,Lacquer,and Related MaterialsD6037 Test Methods for Dry Abrasion Mar Resistance ofHigh Gloss Coatings3.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.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 pad.Mar resistance isassessed by measuring the coatings gloss within the abradedand unabraded areas of test panels.Mar resistance is directlyrelated to the coatings ability to retain gloss in abraded areas.5.Significance and Use5.1 Coatings,particularly the high gloss coatings used onautomobiles,boats,toys,etc.,are subject of a wide variety ofconditions(for example,wiping,cleaning and exposure)dur-ing manufacture and service that can mar their surface.Theability of high gloss coatings to maintain their appearance is animportant product attribute.This test method provides a way toestimate the ability of high gloss coatings to resist mar damage.1This 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 June 1,2013.Published July 2013.Originally approvedin 1998.Last previous edition approved in 2007 as D6279 03(2007).DOI:10.1520/D6279-03R13.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM Intern