Designation:D7027−20StandardTestMethodforEvaluationofScratchResistanceofPolymericCoatingsandPlasticsUsinganInstrumentedScratchMachine1ThisstandardisissuedunderthefixeddesignationD7027;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethoddescribesalaboratoryprocedureusinganinstrumentedscratchmachinetoproduceandquantifysurfacedamageundercontrolledconditions.Thistestmethodisabletocharacterizethescratchresistanceofpolymersbymeasuringmanysignificantmaterialparameters.Thescratch-inducinganddataacquisitionprocessisautomatedtoavoiduser-influencedeffectsthatmayaffecttheresults.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesinparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE1—ThisstandardisequivalenttoISO19252.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2A276/A276MSpecificationforStainlessSteelBarsandShapesD618PracticeforConditioningPlasticsforTestingD638TestMethodforTensilePropertiesofPlasticsD883TerminologyRelatingtoPlasticsD1894TestMethodforStaticandKineticCoefficientsofFrictionofPlasticFilmandSheetingE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE456TerminologyRelatingtoQualityandStatisticsG99TestMethodforWearTestingwithaPin-on-DiskApparatusG171TestMethodforScratchHardnessofMaterialsUsingaDiamondSty...
