Designation:D5804–97(Reapproved2002)AnAmericanNationalStandardStandardTestMethodsforZero-SpanTensileStrength(“DryZero-SpanTensile”)1ThisstandardisissuedunderthefixeddesignationD5804;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodprovidesaquickreliablemeanstomeasurethezero-spantensilestrengthofarandomlyorientedspecimenoffiberswhendry.1.1.1Similarproceduresfordeterminingthezero-spantensilestrengthofarandomlyorientedspecimenoffiberswhenwetarefoundinTestMethodD5803.1.2Inthistestmethod,thefibersaretestedasahandsheetproducedusingastandardizedproceduresuchasTAPPIT205.1.3Whiletestingispossibleonfinishedpapermaterials,informationonfiberqualityfromintermediatestepsinthepulpingorpapermakingprocess,orboth,isfrequentlymoreusefulforimprovingfinishedpaperqualityorimprovingfiberutilizationof,forexample,recycledfibers,orfiberssubjectedtonewpulping,bleaching,orfinishingprocesses.1.4Themodificationsoftheproceduredescribedinthistestmethodrequiredfortestingfinishedpaperisstraightforward;however,testingmustbedoneinthetwoprincipledirectionsofthesheet,asrequiredinTestMethodD828,sincethefinishedpaperorpaperboardwillgenerallyhavenon-randomfiberorientation,resultingindifferentstrengthpropertiesinthetwoprincipledirectionsofthefinishedsheet.Testingofsheetshavingagrammagegreaterthan100g/m2,whichincludessomepapermaterialsdescribedaspaperandmanypaper-boards,isdifficultbecauseofproblemsassociatedwithclamp-ingofindividualfibersasthenumberoffibersperunitareaincreases.1.5Suchmodificationsarenotdescribedinthistestmethod,andiftheyaremade,theyshallbeacknowledgedandclearlydescribedinthereportasdeviationsfromthestandardproce-dure.1.6Inadditiontoameasureofthedryzero-spantensilestrengthofthespecimenoffibers,anindexofthecohesivenessoffibersinthesheetisalsoprovidedbytheratioo...
