Designation:D4704−13StandardTestMethodforTearingStrength,TongueTearofLeather1ThisstandardisissuedunderthefixeddesignationD4704;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodisintendedfordeterminingthetearingstrengthofleatherbymeasuringtheforcerequiredtotearaspecimencutperpendiculartothesurface.Thistestmethoddoesnotapplytowetblue.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1610PracticeforConditioningLeatherandLeatherProd-uctsforTestingD1813TestMethodforMeasuringThicknessofLeatherTestSpecimensD2209TestMethodforTensileStrengthofLeatherD2813PracticeforSamplingLeatherforPhysicalandChemicalTests3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1tonguetearstrength—theloadrequiredtoteartheleatherbetweentwotonguesformedbysplittingtheleatherperpendiculartoitssurface.4.SignificanceandUse4.1Knowledgeofthestrengthofthesamplecanbeadeterminingfactorfortheenduseoftheproduct.5.Apparatus5.1TestingMachine,asdescribedinTestMethodD2209.5.2ThicknessGage,adeadweighttypeofthicknessgageasdescribedinTestMethodD1813.5.3SteelDie,tocuttestspecimens.6.SamplingandTestSpecimens6.1Unlessotherwisespecified,sampletheleatheraccordingtoPracticeD2813.6.2Thespecimenshallbearectangularpieceofleather,1×4in.(25.4×101.6mm)bythefullthicknessoftheunit.Itshallhavea3⁄16in.(4.76m...
