Designation:D6988−21StandardGuideforDeterminationofThicknessofPlasticFilmTestSpecimens1ThisstandardisissuedunderthefixeddesignationD6988;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoversthedeterminationofthethicknessofplasticfilmswherethethicknessisuseddirectlyindeterminingtheresultsoftestsforvariousproperties.Usethispracticeexceptasotherwiserequiredinmaterialspecificationsorinapplicableteststandards.NOTE1—FilmisdefinedinTerminologyD883asanoptionaltermforsheetinghavinganominalthicknessnogreaterthan0.25mm(0.010in.).NOTE2—Alternativemethodsareacceptableiftheymeettherequire-mentsofmeasurementprecisionasnotedinthisguide.NOTE3—Thisguideisnotintendedtoaddressthesamplingtechniquesorthemeasurementoffilmthicknessforthecommercialclassificationofcommercialproductsorforqualitycontrolpurposes.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE4—ThisstandardandISO4593addressthesamesubjectmatterbutdifferintechnicalcontent.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD883TerminologyRelatingtoPlasticsD5947TestMethodsforPhysicalDimensionsofSolidPlasticsSpecimensD6287PracticeforCuttingFilmandSheetingTestSpeci-mens2.2ISOStandard:ISO472Plastics—Vocabulary33.Terminology3....
