Designation:D2941−21StandardTestMethodforMeasuringBreakPatternofLeather(BreakScale)1ThisstandardisissuedunderthefixeddesignationD2941;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthemeasurementofthebreakpatternofshoeupperleatherusinganarbitrarybreakscale.Thistestmethoddoesnotapplytowetblueorwetwhite.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1517TerminologyRelatingtoLeatherD1610PracticeforConditioningLeatherandLeatherProd-uctsforTesting2.2MILStandard:3MIL-STD663VisualInspectionGuideforFootwearUpperLeather3.Terminology3.1Definitions:3.1.1break(ofleather)—thepatternofwrinklesformedonthegrainsurfaceofupperleatherwhenitisbentgrainintoformaconcavesurface.Thischaracteristicisobservedinthevampoftheshoeinwalking.Forthisreasonthistestmethodisprimarilyintendedforevaluationofcutparts.3.2Fordefinitionsofothertermsusedinthistestmethod,refertoTerminologyD1517.4.SignificanceandUse4.1Breakdependsonthefiberstructureandontherelationbetweenthegrainandotherstratao...
