Designation:D6075−13StandardTestMethodforCrackingResistanceofLeather1ThisstandardisissuedunderthefixeddesignationD6075;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthedeterminationoftheresis-tanceofleathertocrackingwhentheleatherisbentorfoldedwiththegrain(orfinish)surfaceontheoutsideofthebend.Heavyleathers(forexample,harness,belt,strap,bag,case,andsoforth)areusuallybentaroundamandrelusingeithermechanicalresistance(forexample,clamp,vise,andsoforth)orbyhand.Lighterleathers(forexample,shoeupper,upholstery,garment,glove,andsoforth)areusuallygivenasharpdouble-fold(crosswise)bendaftercoolingtoalowtemperature.Thistestmethoddoesnotapplytowetblue.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1517TerminologyRelatingtoLeatherD1610PracticeforConditioningLeatherandLeatherProd-uctsforTestingD1813TestMethodforMeasuringThicknessofLeatherTestSpecimens3.Terminology3.1Fordefinitionsofgeneralleathertermsusedinthistestmethod,refertoTerminologyD1517.3.2Definitions:3.2.1finishcracking—theappearanceofcracks(thatis,ruptures)inthefinishofleatherwhichmayextendthroughthefinishlayertothesurfaceofthecrustleatherordeeper.3.2.2graincracking—theappearanceofcracks(thatis,rupturesofthegrainenamel)onthegrainsurfaceoftheleatherwhichmayevenextenddeeperintotheleathercrosssection.4.SummaryofTestMethod4.1Aspecimenofleatherisconditionedandthenbentbyoneofthree...
