Designation:D8331/D8331M−20StandardTestMethodforMeasurementofFilmThicknessofThin-FilmCoatingsbyNon-DestructiveMeansUsingRuggedizedOpticalInterference1ThisstandardisissuedunderthefixeddesignationD8331/D8331M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodencompassesmeasuringthefilmthick-nessofacoilcoatedorganiccoatinglayer.Operatorscanusethismethodinprocessduringthecoatingapplicationorinalaboratorysetting.1.2Thistestmethoddoesnotspecifytheexpectedfilmthickness/testresultsforacoating,northespecific“recipe”fileneededtomeasureacoating.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequivalents;therefore,toensureconformancewiththestandard,eachsystemshallbeusedindependentlyoftheother,andvaluesfromthetwosystemsshallnotbecombined.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.Terminology2.1producer,n—primarymanufacturerofthecoilcoatedmaterial,thatis,thecoilcoater,fromwhichpartsarefabri-cated.2.2recipe,n—acombinationofspecifiedsettingsintheRuggedizedOpticalInterference(ROI)measurementsystemwhichisusedbytheinstrumenttointerpretthereflectanceinformationgatheredduringareadingandprovideanoutputinaspecifiedunitoffilmthicknessmeasurement.2.3ruggedizedopticalinterference(...
