Designation:D4497−10StandardTestMethodforDeterminingtheOpenTimeofHotMeltAdhesives(ManualMethod)1ThisstandardisissuedunderthefixeddesignationD4497;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemanualdeterminationoftheopen-timerangeofhot-meltadhesivesunderthestatedcondi-tions.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsinparenthesesareprovidedforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D907TerminologyofAdhesivesE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1Definitions—ManyofthetermsfoundinthistestmethodaredefinedinTerminologyD907.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1opentime,n—thetimeavailablebetweenapplicationoftheadhesivetothefirstsubstrateandthematingofthesecondsubstratewhichstillresultsinaminimumof50%fibertearwhentestedatambientconditions.4.SummaryofTestMethod4.1Inthistestmethod,opentimeisdeterminedbybondingtogetherwiththeadhesive,piecesofstandardpaperatintervalsof5ssequentiallyafterthemoltenadhesivehasbeenappliedusingaheatedfilmapplicatorononesurface.Thebondedspecimensareexaminedlatertodeterminethelongesttimeperiod,betweenapplicationoftheadhesivetoonesurfaceandmatingwithasecondsurface,whichallowssubstantialbond-ing.5.SignificanceandUse5.1Thistestmethodallowscomparingtheopentimeofseveralhotmeltadhesives.5.2Thistestmethodisnotintendedtoprovidetheopen-timeobservedforaspecificadhesiveinaspecificmanufactur-ingoperation...
