Designation:F410−08(Reapproved2013)StandardTestMethodforWearLayerThicknessofResilientFloorCoveringsbyOpticalMeasurement1ThisstandardisissuedunderthefixeddesignationF410;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthedeterminationofthethick-nessofthewearlayerofresilientnon-textilefloorcoverings,intileorsheetform,withorwithoutfeltbackingorfoamlayer,byopticalmeasurement.1.2Thistestmethodisapplicableforwearlayerswithaminimumthicknessof0.0004in.(0.01mm)toamaximumthicknessof0.1in.(2.54mm),wheremeasurementswithin0.0001in.or0.0025mmaretolerable.1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.SignificanceandUse3.1Thistestmethodisapplicableforwearlayerswithaminimumthicknessof0.001in.(0.02mm)toamaximumthicknessof0.1in.(2.54mm),wheremeasurementswithin0.0005in.or0.01mmaretolerable.4.Apparatus4.1CompoundMicroscope,havingamagnificationofatleast40×,equippedwithaneyepiecemicrometeroftheruleddiskorfilartype.Thescaleshallcoverapproximately0.1in.(2.54mm)andeachdivisionshallbeequaltoapproximately0.0004in.(0.01mm)attheobject.Eitherabinocularorstandardmicroscopemaybeused.4.2VerticalIlluminator(recommended),toilluminatethespecimen.Ifanothersourceisused,thelightshouldfallonthespecimen...
