Designation:G171−03(Reapproved2009)´2StandardTestMethodforScratchHardnessofMaterialsUsingaDiamondStylus1ThisstandardisissuedunderthefixeddesignationG171;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—Deletederroneousreferencein8.4editoriallyinMay2009.ε2NOTE—ReferencetospecificbrandofscratchtesterwasremovedfromAppendixX1editoriallyinSeptember2009.1.Scope1.1Thistestmethodcoverslaboratoryproceduresforde-terminingthescratchhardnessofthesurfacesofsolidmateri-als.Withincertainlimitations,asdescribedinthisguide,thistestmethodisapplicabletometals,ceramics,polymers,andcoatedsurfaces.Thescratchhardnesstest,asdescribedherein,isnotintendedtobeusedasameanstodeterminecoatingadhesion,norisitintendedforusewithotherthanspecifichemispherically-tipped,conicalstyli.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2G40TerminologyRelatingtoWearandErosionG117GuideforCalculatingandReportingMeasuresofPrecisionUsingDatafromInterlaboratoryWearorEro-sionTests3.Terminology3.1Definitions—FordefinitionsoftermsapplicabletothisstandardseeTerminologyG40.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1scratchhardnessnumber,n—aquantity,expressedinunitsofforceperunitarea,thatcharacterizestheresistanceofasolidsurfacetopenetrationbyamovingstylusofgiventipradiusunderaconstantnormalforceandspeed;namely,HSP5kPw2where:HSP=scratchhardnessnumber,k=ageometricalconstant,P=appliednormalforce,andw=...
